suzuki rv125 k7 supp manual

9 9 5 0 1 - 3 1 1 5 0 - 0 1 E

4 mm

Printed in JapanK7

USE THIS MANUAL WITH:RV125 SERVICE MANUAL (99500-31233-01E)

RV

12

5

DIC120No.3900 RV125K7_01E SUPPLY 99500-31150-01E 2006.8.28 Cover_14 PS Printing (4 mm) 2/1

K7

AdministratorSAMPLE_JKT

RV125K7 (07-MODEL) 1

RV125K7 (07-MODEL)

Thiser

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ECM TERMINAL ....................................................................................... 29SELF-DIAGNOSIS FUNCTION................................................................. 30

FAIL-SAFE FUNCTION............................................................................. 32FI SYSTEM TROUBLESHOOTING .......................................................... 33

SENSORS........................................................................................................... 79CKP SENSOR INSPECTION .................................................................... 79CKP SENSOR REMOVAL AND INSTALLATION .................................... 79IAP/TP/IAT SENSOR INSPECTION ......................................................... 79ET SENSOR INSPECTION ....................................................................... 79ET SENSOR REMOVAL AND INSTALLATION ....................................... 80TO SENSOR INSPECTION....................................................................... 80 CCONTENTS

s manual describes service data, service specifications, troubleshooting for FI system andvicing procedures which differ from those of the K6 (06-model).OTE:

Any differences between the K6 (06-model) and K7 (07-model) in specifications andservice data are indicated with an asterisk mark (*).

Please refer to the K6 (06-model) service manual and service information for detailswhich are not given in this manual.

ABBREVIATIONS USED IN THIS MANUAL ....................................................... 3SPECIFICATIONS (RV125K7) ............................................................................. 4

ENGINE ....................................................................................................... 4DRIVE TRAIN .............................................................................................. 4CHASSIS ..................................................................................................... 5ELECTRICAL .............................................................................................. 5CAPACITIES ............................................................................................... 5

PERIODIC MAINTENANCE SCHEDULE ............................................................ 6PERIODIC MAINTENANCE CHART .......................................................... 6

MAINTENANCE AND TUNE-UP PROCEDURES ............................................... 7THROTTLE CABLE PLAY.......................................................................... 7FUEL LINE .................................................................................................. 8

SDS CHECK ......................................................................................................... 9FI SYSTEM DIAGNOSIS .................................................................................... 13

PRECAUTIONS IN SERVICING ............................................................... 13FI SYSTEM TECHNICAL FEATURES...................................................... 20OPYRIGHT SUZUKI MOTOR CORPORATION 2006

TO SENSOR REMOVAL AND INSTALLATION....................................... 81HO2 SENSOR INSPECTION .................................................................... 81HO2 SENSOR REMOVAL AND INSTALLATION .................................... 81

AdministratorSAMPLE_HONBUN

2 RV125K7 (07-MODEL)

RV125K7 (07-MODEL)

CONTENTSFUEL SYSTEM .................................................................................................. 83

FUEL TANK.............................................................................................. 83FUEL LEVEL INDICATOR CHECK RELAY ............................................ 85FUEL FILTER ........................................................................................... 86THROTTLE BODY.................................................................................... 87

WIRING DIAGRAM ............................................................................................ 93CABLE AND HOSE ROUTING.......................................................................... 94SPECIAL TOOLS............................................................................................... 97TIGHTENING TORQUE ..................................................................................... 97SERVICE DATA................................................................................................. 98

COUNTRY AND AREA CODESThe following codes stand for the applicable country(-ies) and area(-s).

MODEL CODE COUNTRY or AREA EFFECTIVE FRAME NO.

RV125 E-02E-19U.K.E.U.

JS1BT111200101909 JS1BT111100111063



ABBREVIATIONS USED IN THIS MANUALA

ABDC : After Bottom Dead CenterAC : Alternating CurrentACL : Air Cleaner, Air Cleaner BoxAPI : American Petroleum InstituteATDC : After Top Dead CenterA/F : Air Fuel Mixture

BBBDC : Before Bottom Dead CenterBTDC : Before Top Dead CenterB+ : Battery Positive Voltage

CCKP Sensor : Crankshaft Position Sensor

(CKPS)CKT : CircuitCLP Switch : Clutch Lever Position Switch

(Clutch Switch)CO : Carbon MonoxideCPU : Central Processing Unit

DDC : Direct CurrentDMC : Dealer Mode CouplerDRL : Daytime Running LightDTC : Diagnostic Trouble Code

EECM : Engine Control Module

Engine Control Unit (ECU)(FI Control Unit)

ECT Sensor : Engine Coolant TemperatureSensor (ECTS), Water Temp.Sensor (WTS)

ET sensor Engine Temperature sensor

FFI : Fuel Injection, Fuel Injector (Dis-

charge pump; DCP)FP : Fuel PumpFPR : Fuel Pressure RegulatorFP Relay : Fuel Pump Relay

GGEN : Generator

HHC : HydrocarbonsHO2 Sensor : Heated Oxygen Sensor (HO2S)

IIAP Sensor : Intake Air Pressure Sensor (IAPS)IAT Sensor : Intake Air Temperature Sensor

(IATS)IG : IgnitionISC Valve : Idle Speed control valve (ISCV)

LLCD : Liquid Crystal DisplayLED : Light Emitting Diode

(Malfunction Indicator Lamp)LH : Left Hand

MMAL-Code : Malfunction Code

(Diagnostic Code)Max : MaximumMIL : Malfunction Indicator Lamp

(LED)Min : Minimum

NNOx : Nitrogen Oxides

OOHC : Over Head Camshaft

PPCV : Positive Crankcase

Ventilation (Crankcase Breather)

RRH : Right HandROM : Read Only Memory

SSAE : Society of Automotive EngineersSDS : Suzuki Diagnosis System

TTO Sensor : Tip Over Sensor (TOS)TP Sensor : Throttle Position Sensor (TPS)GND : Ground



SPECIFICATIONS (RV125K7)DIMENSIONS AND DRY MASSOverall length....................................................... 2 140 mmOverall width ........................................................ 860 mmOverall height....................................................... 1 120 mmWheelbase ........................................................... 1 385 mmGround clearance ................................................ 215 mmSeat height........................................................... 770 mmDry mass.............................................................. 118 kg

ENGINEType..................................................................... Four-stroke, air-cooled, OHCNumber of cylinders ............................................. 1Bore ..................................................................... 57.0 mmStroke................................................................... 48.8 mmDisplacement ....................................................... 125 cmCompression ratio................................................ 9.2 : 1Fuel system.......................................................... Fuel injectionAir cleaner............................................................ Polyurethane foam elementStarter system...................................................... ElectricLubrication system............................................... Wet sumpIdle speed ............................................................ 1 500 100 r/min

DRIVE TRAIN Clutch................................................................... Wet multi-plate typeTransmission........................................................ 6-speed constant meshGearshift pattern .................................................. 1-down, 5-upPrimary reduction ratio......................................... 3.470 (59/17)Gear ratios, Low .................................................. 3.000 (33/11)

2nd................................................... 1.857 (26/14)3rd.................................................... 1.368 (26/19)4th.................................................... 1.095 (23/21)5th.................................................... 0.923 (24/26)Top................................................... 0.833 (20/24)

Final reduction ratio ............................................. 3.500 (49/14)Drive chain ........................................................... D.I.D. 428, 134 links



CHASSISFront suspension................................................. Telescopic, coil spring, oil dampedRear suspension ................................................. Swingarm type, coil spring, oil dampedFront suspension stroke...................................... 110 mmRear wheel travel ................................................ 136 mmCaster.................................................................. 26 Trail ..................................................................... 91 mmSteering angle ..................................................... 45 (right & left)Turning radius ..................................................... 2.1 mFront brake.......................................................... Disc brakeRear brake .......................................................... Drum brakeFront tire size ...................................................... 130/80-18 M/C 66P, tube typeRear tire size ....................................................... 180/80-14 M/C 78P, tube type

ELECTRICAL lgnition type ......................................................... Electronic ignition (Transistorized)lgnition timing ...................................................... 13 B.T.D.C. at 1 500 r/minSpark plug ........................................................... NGK CR8E or DENSO U24ESR-NBattery................................................................. 12 V 21.6 kC (6 Ah)/10 HRGenerator ............................................................ Three-phase A.C. generatorFuse .................................................................... 20 AHeadlight ............................................................. 12 V 60/55 WBrake light/Taillight.............................................. 12 V 21/5 WPosition light........................................................ 12 V 4 W............E-19

12 V 5 W............E-02Turn signal light................................................... 12 V 21 WSpeedometer light ............................................... 12 V 1.7 WNeutral indicator light .......................................... 12 V 3.4 WHigh beam indicator light..................................... 12 V 1.7 WTurn signal indicator light .................................... 12 V 3.4 WFI indicator light................................................... 12 V 3 WFuel level indicator light....................................... 12 V 3.4 W

CAPACITIES Fuel tank, including reserve ................................ 6.5 LEngine oil, oil change .......................................... 850 ml

filter change ....................................... 950 mloverhaul ............................................. 1 200 ml

These specifications are subject to change without notice.



PERIODIC MAINTENANCE SCHEDULEThe chart below lists the recommended intervals for all the required periodic service work necessary to keepthe motorcycle operating at peak performance and economy. Mileages are expressed in terms of kilometersand time for your convenience.NOTE:More frequent servicing may be performed on motorcycles that are used under severe conditions.

PERIODIC MAINTENANCE CHART

NOTE:I = Inspect and clean, adjust, replace or lubricate as necessary; R = Replace; T = Tighten

IntervalItem

km 1 000 4 000 8 000months 5 20 40

Air cleaner element I IExhaust pipe bolts and muffler mounting bolts T T T

Valve clearance I I ISpark plug I R

Fuel line I I IReplace every 4 yearsEngine oil R R REngine oil filter R RThrottle cable play I I IClutch I I I

Drive chain I I IClean and lubricate every 1 000 kmBrakes I I I

Brake hose I IReplace every 4 years

Brake fluid I IReplace every 2 yearsWheels and tires I ISteering I IFront fork IRear suspension IChassis nuts and bolts T T T



MAINTENANCE AND TUNE-UP PROCEDURESThis section describes the servicing procedures for each Peri-odic Maintenance item which differ from those of the RV125K6(06-MODEL).For details other than the following items, refer to the RV125Service Manual.

THROTTLE CABLE PLAY

Adjust the throttle cable play A with the following three steps.First step: Loosen the lock-nut 2 of the throttle returning cable 1. Turn in the adjuster 3 fully.Second step: Loosen the lock-nut 5 of the throttle pulling cable 4. Turn the adjuster 6 in or out until the throttle cable play A

should be 2.0 4.0 mm at the throttle grip. Tighten the lock-nut 5 while holding the adjuster 6.Third step: While holding the throttle grip at the fully closed position,

slowly turn out the adjuster 3 of the throttle returning cable 1to feel resistance.

Tighten the lock-nut 2 while holding the adjuster 3. Throttle cable play A: 2.0 4.0 mm

Inspect initially at 1 000 km (5 months) and every 4 000km (20 months) thereafter.

After the adjustment is completed, check that handle-bars movement does not raise the engine idle speedand that the throttle grip returns smoothly and auto-matically.



FUEL LINE

Inspect the fuel hoses for damage and fuel leakage. If anydefects are found, replace the fuel hose with a new one.

Inspect initially at 1 000 km (5 months) and every4 000 km (20 months) thereafter.Replace every 4 years.



SDS CHECKUsing SDS, sample the data at the time of new and periodic vehicle inspections.

After saving the sampled data in the computer, file them by model and by user. The periodically filed data help improve the accuracy of troubleshooting since they can indicate the conditionof vehicle functions that has changed with time.For example, when a vehicle is brought in for service but the troubleshooting of a failure is not easy, compar-ing the current data value to the past filed data value at time of normal condition can allow the specificengine failure to be determined.Also, in the case of a customer vehicle which is not periodically brought in for service with no past data valuehaving been saved, if the data value of a good vehicle condition have been already saved as a master(STD), comparison between the same models helps facilitate the troubleshooting. Remove the right frame cover. (RV125K3 5-3) Set up the SDS tools. (Page 39) 09904-41010: SDS set tool

99565-01010-009: CD-ROM Ver. 9

NOTE:* Before taking the sample of data, check and clear the Past DTC. (Page 40)* A number of different data under a fixed condition as shown below should be saved and filed as sample.

SAMPLE:Data sampled from cold starting through warm-up


10 RV125K7 (07-MODEL)

Data at 3 000 r/min under no load

Data at the time of racing


RV125K7 (07-MODEL) 11

Data of intake negative pressure during idling (90 C)

Data of manifold absolute pressure operation at the time of starting


12 RV125K7 (07-MODEL)

Example of troubleThree data; value 1 (current data 1), value 2 (past data 2) and value 3 (past data 3); can be made in compar-ison by showing them in the graph. Read the change of value by comparing the current data to the past datathat have been saved under the same condition, then you may determine how changes have occurred withthe pass of time and identify what problem is currently occurring.

With DTC not output, if the value of engine temperature is found to be higher than the data saved previously,the possible cause may probably lie in a sensor circuit opened or ground circuit opened or influence of inter-nal resistance value changes, etc.

Abnormal value of engine temperature

No DTC output

Unstable idling speed


RV125K7 (07-MODEL) 13

FI SYSTEM DIAGNOSISPRECAUTIONS IN SERVICINGWhen handling the component parts or servicing the FI system,observe the following points for the safety of the system.

ELECTRICAL PARTSConnector/Coupler When connecting a connector, be sure to push it in until a

click is felt.

With a lock type coupler, be sure to release the lock when dis-connecting, and push in fully to engage the lock when con-necting.

When disconnecting the coupler, be sure to hold the couplerbody and do not pull the lead wires.

Inspect each terminal on the connector/coupler for loosenessor bending.

Inspect each terminal for corrosion and contamination.The terminals must be clean and free of any foreign materialwhich could impede proper terminal contact.

Inspect each lead wire circuit for poor connection by shaking itby hand lightly. If any abnormal condition is found, repair orreplace.

When taking measurements at electrical connectors using atester probe, be sure to insert the probe from the wire harnessside (backside) of the connector/coupler.

1 Coupler2 Probe

Click


14 RV125K7 (07-MODEL)

When connecting meter probe from the terminal side of thecoupler (where connection from harness side not being possi-ble), use extra care not to force and cause the male terminalto bend or the female terminal to open.Connect the probe as shown to avoid opening of female ter-minal.Never push in the probe where male terminal is supposed tofit.

Check the male connector for bend and female connector forexcessive opening. Also check the coupler for locking (loose-ness), corrosion, dust, etc.

1 Coupler2 Probe3 Where male terminal fits

FUSE When a fuse blows, always investigate the cause to correct it

and then replace the fuse. Do not use a fuse of a different capacity. Do not use wire or any other substitute for the fuse.

SWITCH Never apply grease material to switch contact points to pre-

vent damage.

ECM/VARIOUS SENSORS Since each component is a high-precision part, great care

should be taken not to apply any sharp impacts duringremoval and installation.

Be careful not to touch the electrical terminals of the ECM.The static electricity from your body may damage this part.

INCORRECT


RV125K7 (07-MODEL) 15

When disconnecting and connecting the ECM, make sure toturn OFF the ignition switch 1, or electronic parts may getdamaged.

Battery connection in reverse polarity is strictly prohibited. Such a wrong connection will damage the components of theFI system instantly when reverse power is applied.

Removing any battery terminal of a running engine is strictlyprohibited.The moment such removal is made, damaging counter elec-tromotive force will be applied to the ECM which may result inserious damage.

Before measuring voltage at each terminal, check to makesure that battery voltage is 11 V or higher. Terminal voltagecheck with a low voltage battery will lead to erroneous diagno-sis.

Never connect any tester (voltmeter, ohmmeter, or whatever)to the ECM when its coupler is disconnected.Otherwise, damage to ECM may result.

Never connect an ohmmeter to the ECM with its coupler con-nected. If attempted, damage to ECM or sensors may result.

Be sure to use a specified voltmeter/ohmmeter. Otherwise,accurate measurements may not be obtained and personalinjury may result.

INCORRECT


16 RV125K7 (07-MODEL)

ELECTRICAL CIRCUIT INSPECTION PROCEDUREWhile there are various methods for electrical circuit inspection,described here is a general method to check for open and shortcircuit using an ohmmeter and a voltmeter.

Open circuit checkPossible causes for the open circuits are as follows. As thecause can exist in the connector/coupler or terminal, they needto be checked carefully. Loose connection of connector/coupler. Poor contact of terminal (due to dirt, corrosion or rust, poor

contact tension, entry of foreign object etc.). Wire harness being open. Poor terminal-to-wire connection. Disconnect the negative cable from the battery. Check each connector/coupler at both ends of the circuit

being checked for loose connection. Also check for conditionof the coupler lock if equipped.

1 Sensor2 ECM*1 Check for loose connection.

Using a test male terminal, check the female terminals of thecircuit being checked for contact tension.Check each terminal visually for poor contact (possiblycaused by dirt, corrosion, rust, entry of foreign object, etc.). Atthe same time, check to make sure that each terminal is fullyinserted in the coupler and locked.If contact tension is not enough, rectify the contact to increasetension or replace.The terminals must be clean and free of any foreign materialwhich could impede proper terminal contact.

*1 Check contact tension by insert-ing and removing.

*2 Check each terminal for bendand proper alignment.

Using continuity inspect or voltage check procedure asdescribed below, inspect the wire harness terminals for opencircuit and poor connection. Locate abnormality, if any.

A Looseness of crimpingB OpenC Thin wire (a few strands left)

*1

*1

*2


RV125K7 (07-MODEL) 17

Continuity check Measure resistance across coupler B (between A and C in

the figure).If no continuity is indicated (infinity or over limit), the circuit isopen between terminals A and C.

1 ECM

Disconnect the coupler B and measure resistance betweencouplers A and B.If no continuity is indicated, the circuit is open between cou-plers A and B. If continuity is indicated, there is an open cir-cuit between couplers B and C or an abnormality in couplerB or coupler C.

1 ECM

Voltage checkIf voltage is supplied to the circuit being checked, voltage checkcan be used as circuit check. With all connectors/couplers connected and voltage applied

to the circuit being checked, measure voltage between eachterminal and body ground.

If measurements were taken as shown in the figure at the rightand results are as listed below, it means that the circuit is openbetween terminals A and B.

Voltage Between:C and body ground: Approx. 5 VB and body ground: Approx. 5 VA and body ground: 0 V

Also, if measured values are as listed below, a resistance(abnormality) exists which causes the voltage drop in the circuitbetween terminals A and B.

Voltage Between:C and body ground: Approx. 5 V B and body ground: Approx. 5 V 2 V voltage dropA and body ground: 3 V

5 V

0 V

5 V

5 V


18 RV125K7 (07-MODEL)

Short circuit check (wire harness to ground) Disconnect the negative cable from the battery. Disconnect the connectors/couplers at both ends of the circuit

to be checked.NOTE:If the circuit to be checked branches to other parts as shown,disconnect all connectors/couplers of those parts. Otherwise,diagnosis will be misled. Measure resistance between terminal at one end of circuit (A

terminal in figure) and body ground. If continuity is indicated,there is a short circuit to ground between terminals A and C.

1 Other parts*1 To other parts

Disconnect the connector/coupler included in circuit (couplerB) and measure resistance between terminal A and bodyground.If continuity is indicated, the circuit is shorted to the groundbetween terminals A and B.

1 ECM*1 To other parts

*1

5 V

*1


RV125K7 (07-MODEL) 19

USING THE MULTI-CIRCUIT TESTER Use the Suzuki multi-circuit tester set (09900-25008). Use well-charged batteries in the tester. Be sure to set the tester to the correct testing range.

Using the tester Incorrectly connecting the + and - probes may cause the

inside of the tester to burnout. If the voltage and current are not known, make measure-

ments using the highest range. When measuring the resistance with the multi-circuit tester 1,

will be shown as 10.00 M and 1 flashes in the display. Check that no voltage is applied before making the measure-

ment. If voltage is applied the tester may be damaged. After using the tester, turn the power off. 09900-25008: Multi-circuit tester setNOTE:* When connecting the multi-circuit tester, use the needle

pointed probe to the back side of the lead wire coupler andconnect the probes of tester to them.

* Use the needle pointed probe to prevent the rubber of thewater proof coupler from damage. 09900-25009: Needle pointed probe set


20 RV125K7 (07-MODEL)

FI SYSTEM TECHNICAL FEATURESINJECTION TIME (INJECTION VOLUME)The factors to determine the injection time include the basic fuel injection time, which is calculated on thebasis of intake air pressure, engine speed and throttle opening angle, and various compensations.These compensations are determined according to the signals from various sensors that detect the engineand driving conditions.

Intake Air PressureSensor (IAP Sensor)

Intake air pressuresignal

Engine speedsignal

Throttle opening anglesignal

Crankshaft PositionSensor (CKP Sensor)

Throttle PositionSensor (TP Sensor)

VariousSensors

Various signals

Injection signalFuel injector

ECM

Basicfuelinjectiontime

Ultimatefuelinjectiontime

Compensation


RV125K7 (07-MODEL) 21

COMPENSATION OF INJECTION TIME (VOLUME)The following different signals are output from the respective sensors for compensation of the fuel injectiontime (volume).

INJECTION STOP CONTROL

SIGNAL DESCRIPTIONENGINE TEMPERATURE SENSOR SIGNAL

When engine temperature is low, injection time (volume) is increased.

INTAKE AIR TEMPERATURESENSOR SIGNAL

When intake air temperature signal is low, injection time (vol-ume) is increased.

HEATED OXYGEN SENSOR SIGNAL Air/fuel ratio is compensated to the theoretical ratio from density of oxygen in exhaust gasses. The compensation occurs in such a way that more fuel is supplied if detected air/fuel ratio is lean and less fuel is supplied if it is rich.

ENGINE RPM SIGNAL At high speed, the injection time (volume) is increased.When starting engine, additional fuel is injected during cranking engine.

ACCELERATION SIGNAL/DECELERATION SIGNAL

During acceleration, the fuel injection time (volume) is increased in accordance with the throttle opening speed and engine rpm. During deceleration, the fuel injection time (vol-ume) is decreased.

FUEL INJECTOR DRIVE CURRENTSIGNAL

ECM detects this current and compensates the injection time (volume).

SIGNAL DESCRIPTIONTIP-OVER SENSOR SIGNAL (FUEL SHUT-OFF)

When the motorcycle tips over, the tip-over sensor sends a signal to the ECM. Then, this signal cuts OFF current sup-plied to the fuel injector and ignition coil.

OVER-REV. LIMITER SIGNAL The fuel injector stops operation when engine rpm reaches rev. limit rpm.


22 RV125K7 (07-MODEL)

FI SYSTEM PARTS LOCATION

A ECM D Ignition coil (IG coil)B Tip-over sensor (TOS) E SpeedometerC Heated oxygen sensor (HO2S)


RV125K7 (07-MODEL) 23

A ECM H Engine temperature sensor (ETS) F Fuel injector I Crankshaft position sensor (CKPS)G ISC valve J Intake air pressure sensor/Throttle position sensor/Intake air temperature sensor

(IAPS/TPS/IATS)


24 RV125K7 (07-MODEL)

FI SYSTEM WIRING DIAGRAM

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Igni

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ISC

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Engi

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Igni

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RV125K7 (07-MODEL) 25

FUEL INJECTORThe system employs fuel injector (Discharge pump; DCP) that causes injection fuel to be pressurized withinthe pump.The fuel injector pressurizes gravity fed fuel with its plunger and injects the pressurized fuel into the intakepipe. With the pressure plunger controlled by ECM, necessary volume of fuel is injected at the best timingfor the engine operating condition.

Operation When the plunger returns, fuel in the pump chamber enters through IN check valve. By the ECM signal, the coil is energized causing the plunger to pressurize fuel. This pressurization occurs

after vapor inside the pump chamber has been bled through the pressure valve. When the pressurization begins, OUT check valve opens and the fuel pressure rises until the injection

nozzle opens. The volume of fuel injection is controlled by the length of time in which the plunger compresses fuel. When the ignition switch is turned ON, the discharge pump starts to operate for 2 seconds for purging (ini-

tial operation).

Vapor

Coil

Pressure valve

IN check valve

OUT check valve

Fuel

Filter

Orifice

Injection

Plunger


26 RV125K7 (07-MODEL)

FUEL CIRCULATIONFrom the fuel tank, fuel enters into the fuel injector through the fuel filter. Vapor generated here returns tothe fuel tank.

ECMECM (Engine Control Module) consists of CPU (Central Pro-cessing Unit), memory (ROM/RAM) and IN/OUT section. Sig-nals from various sensors are sent to the input section and thento CPU. On the basis of information received, CPU performs cal-culation of necessary amount of fuel injection by means of amap that is programmed for various engine conditions andsends operation signal from the output section to fuel injector.Light load: When the engine load is light, the fuel injection time

(volume) is determined on the basis of intake airpressure and engine speed.

High load: When the engine load is high, the fuel injection time(volume) is determined on the basis of throttle valveopening and engine speed.

ET SENSORET (Engine Temperature) sensor sends the signal of enginetemperature as thermistor ohmic value, which is then detectedby ECM. When the engine temperature is low, the injection vol-ume increases.The thermistor ohmic value increases with the engine tempera-ture low and it decreases with the temperature high.

1 3-way joint *1 From fuel tank2 Fuel filter *2 Fuel tank return3 Fuel injector

*2 *2

*1 *1


RV125K7 (07-MODEL) 27

TO SENSORTO (Tip-Over) sensor detects the vehicle inclination. When thevehicle tips to more than 65, a signal is sent to ECM. When thissignal continues for more than 4 seconds, ECM interrupts cur-rent to fuel injector and ignition coil.To restart the engine, turn the ignition switch OFF once and thenattempt starting in the normal procedure.

IAP/TP/IAT SENSORThe IAP sensor/TP sensor/IAT sensor are combined into one.IAP sensorThe value of intake air pressure is converted into an electricalsignal and sent to ECM.The base fuel injection time (volume) in light load is determinedin accordance with this electrical signal (output signal).The higher the intake air pressure, the higher the signal voltagebecomes.TP sensorTP (Throttle Position) sensor is a sort of variable resistor anddetects the throttle valve opening.The sensor voltage is translated to throttle opening voltage andsent to ECM.The base fuel injection time (volume) in high load is determinedin accordance with this electrical signal (output signal).The wider the throttle opening, the higher the signal voltagebecomes.IAT sensorIAT (Intake Air Temperature) sensor senses the intake air tem-perature as ohmic value of thermistor and sends it to ECM.When the intake air temperature is low, the injection volume isincreased.The thermistor ohmic value increases with the intake air temper-ature low and decreases with the temperature high.

65 65


28 RV125K7 (07-MODEL)

CKP SENSORCKP (Crank position) sensor generates the reference ignitionsignal and sends it to ECM.ECM calculates and determines the injection and ignition tim-ings on the basis of this signal.

HO2 SENSORHO2 (Heated Oxygen) sensor is made of zirconia element (plat-inum plated) which changes output voltage depending on theoxygen concentration difference between its internal and exter-nal surfaces.The terminal voltage change is dependent on the oxygen con-centration in the exhaust gas. This detected voltage value there-fore represents the oxygen concentration.The terminal voltage decreases when the oxygen concentrationis high, and increases when it is low.NOTE:As the zirconia element is not conductive below 250 C, HO2sensor will not function properly until the engine is at normaloperating temperature.

ISC valveISC (Idle Speed Control) valve controls the cold engine fast idlespeed as well as warmed engine idle speed.The air volume is adjusted by opening or closing the bypass portprovided in the throttle port.By controlling the fuel injection volume and air flow, the idlespeed is maintained at a constant level, eliminating the need ofmanual adjustment.


RV125K7 (07-MODEL) 29

ECM TERMINAL

TERMINALNO. CIRCUIT

TERMINALNO. CIRCUIT

1 Power ground (E0) D Ignition coil2 ISC valve E FI indicator light3 Control ground (E1) F Fuel injector -4 Sensor ground (E2) G Mode select switch5 Power source (+B) H Fuel injector +6 HO2 sensor heater I 7 J Neutral switch8 Clutch switch K ET sensor (ET)9 Power source for sensors (VCC) L IAT sensor (IAT)0 M TP sensor (TP)A TO sensor (TO) N IAP sensor (IAP)B O

C HO2 sensor (HO2) P CKP sensor (CKP)

ECM coupler


30 RV125K7 (07-MODEL)

SELF-DIAGNOSIS FUNCTIONThe self-diagnosis function is incorporated in the ECM. The function has two modes, User mode andDealer mode. The user can only be notified by the FI indicator light. To check the function of the individualFI system devices, the dealer mode is provided. In this check, the special tool is necessary to read the codeof the malfunction items.

USER MODE

*1When one of the signals is not received by ECM, the fail-safecircuit works and injection is not stopped. In this case, FI indica-tor light is lighted and the motorcycle can run. *2The injection signal is stopped, when the crankshaft positionsensor signal, tip-over sensor signal, ignition signal, injector sig-nal or ignition switch signal is not sent to ECM. In this case, FIindicator light is ON and blinks and the motorcycle can not run.

When the ignition switch is turned ON, FI indicator light is lit for 2seconds and thereafter remains unlit.When the ignition switch is turned ON and the engine stopswitch is turned OFF, in this case, the speedometer does notreceive any signal from ECM, and the speedometer does notlight FI indicator light.If FI indicator light is not lighted when turning the ignition switchto ON, the FI indicator light does not indicate the trouble code. It is necessary to check the wiring harness between ECM andspeedometer couplers.The possible cause of this indication is as follows;Engine stop switch is in OFF position. Fuse is burnt. FI indicator bulb is burnt.

MALFUNCTION FI INDICATOR LIGHT INDICATIONNO ----YES

Engine can startFI indicator light turns ON.*1

Engine can not start FI indicator light turns ON and blinks.*2

FI


RV125K7 (07-MODEL) 31

DEALER MODEThe defective function is memorized in the ECM. Use the special tools coupler to connect to the dealermode coupler. The memorized malfunction code is displayed by the flashing pattern of FI indicator light.Malfunction means that the ECM does not receive normal signal from the devices. These affected devicesare indicated in the code form. 09930-82720: Mode select switch

The DTC is indicated from small code to large code.

FI

Before checking DTC (Diagnostic Trouble Code), do not disconnect the ECM lead wire coupler. If the coupler from the ECM is disconnected, the DTC memory is erased and can not bechecked.

MALFUNCTION FI INDICATOR LIGHT INDICATIONNO OFFYES ON and blinks


32 RV125K7 (07-MODEL)

FAIL-SAFE FUNCTIONFI system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a mini-mum performance necessary even under malfunction condition.

The engine can start and can run even if the above signal is not received from each sensor. But, the enginerunning condition is not complete, providing only emergency help (by fail-safe circuit). In this case, it is nec-essary to bring the motorcycle to the workshop for complete repair.

ITEM FAIL-SAFE MODE STARTING ABILITYRUNNING ABILITY

IAP sensor Intake air pressure is fixed to 101 kPa (760 mmHg). YES YES

TP sensor The throttle opening is fixed to full open position.Ignition timing is also fixed.

YES YES

IAT sensor Intake air temperature value is fixed to 25 C. YES YES

ET sensor Engine temperature value is fixed to 80 C. YES YES

HO2 sensor Feedback compensation is inhibited. (Air/fuel ratio is fixed to normal.) YES YES

ISC valve ISC operation is stopped. YES YES


RV125K7 (07-MODEL) 33

FI SYSTEM TROUBLESHOOTINGCUSTOMER COMPLAINT ANALYSISRecord details of the problem (failure, complaint) and how it occurred as described by the customer. For thispurpose, use of such an inspection form such as below will facilitate collecting information required forproper analysis and diagnosis.

EXAMPLE: CUSTOMER PROBLEM INSPECTION FORM

User name: Model: VIN:Date of issue: Date Reg. Date of problem: Mileage:

FI indicator light condition Always ON Sometimes ON Always OFF Good condition

PROBLEM SYMPTOMS Difficult Starting Poor Driveability No cranking Hesitation on acceleration No initial combustion Back fire/ After fire No combustion Lack of power Poor starting at ( cold warm always)

Surging Abnormal knocking

Other Engine rpm jumps briefly Other

Poor Idling Engine Stall when Poor fast Idle Immediately after start Abnormal idling speed ( High Low) ( r/min)

Throttle valve is opened Throttle valve is closed

Unstable Load is applied Hunting ( r/min to r/min) Other Other OTHERS:


34 RV125K7 (07-MODEL)

NOTE:The above form is a standard sample. The form should be modified according to conditions and characteris-tics of each market.

VISUAL INSPECTION Prior to diagnosis using the mode select switch or SDS, perform the following visual inspections. The rea-

son for visual inspection is that mechanical failures (such as oil leakage) cannot be displayed on thescreen with the use of mode select switch or SDS.

* Engine oil level and leakage (RV125K3 2-10)* Fuel level and leakage (Page 8 and 84)* Clogged air cleaner element (RV125K3 2-4)* Battery condition (RV125K3 6-31)* Throttle cable play (Page 7)* Broken fuse* FI indicator light operation (Page 30)* Exhaust gas leakage and noise (RV125K3 2-19)* Each coupler disconnection

MOTORCYCLE/ENVIRONMENTAL CONDITION WHEN PROBLEM OCCURSEnvironmental condition

Weather Fair Cloudy Rain Snow Always Other Temperature Hot Warm Cool Cold ( C) AlwaysFrequency Always Sometimes ( times/ day, month) Only once

Under certain conditionRoad Urban Suburb Highway Mountainous ( Uphill Downhill)

Tarmacadam Gravel Other Motorcycle condition

Engine condition Cold Warming up phase Warmed up Always Other at starting Immediately after start Racing without load Engine speed ( r/min)

Motorcycle con-dition

During driving: Constant speed Accelerating Decelerating Right hand corner Left hand corner At stop Motorcycle speed when problem occurs ( km/h) Other


RV125K7 (07-MODEL) 35

SELF-DIAGNOSTIC PROCEDURESNOTE:* Do not disconnect the coupler from ECM, battery cable from

battery, ECM ground wire from engine or main fuse beforeconfirming the DTC (Diagnostic Trouble Code) stored in mem-ory. Such disconnection will erase the memorized informationin ECM memory.

* DTC stored in ECM memory can be checked by the specialtool.

* Before checking DTC, read SELF-DIAGNOSIS FUNCTIONUSER MODE and DEALER MODE (Page 30 and 31)carefully to have good understanding as to what functions areavailable and how to use it.

* Be sure to read PRECAUTIONS IN SERVICING (Page 13)before inspection and observe what is written there.

Remove the right frame cover. (RV125K3 5-3) Connect the special tool to the dealer mode coupler at the wir-

ing harness. Turn the special tools switch ON and check the malfunction

code to determine the malfunction part. 09930-82720: Mode select switch


36 RV125K7 (07-MODEL)

UNDERSTANDING THE DTC (Diagnostic Trouble Code)A two-digit DTC is shown through the flashing pattern of the FI indicator light.The DTCs are displayed from a smaller number to a larger number in that order. When all the applicableDTCs have been displayed, the displaying of the DTCs repeat from the first one again. If no DTC is recorded, the FI indicator light will not turned on.

0.3 0.30.3

0.3

1.0 3.0

0.3 0.3 0.3 0.3 0.3

0.3 0.30.3

1.0 3.0 1.0

0.3

0.3 0.30.3

1 2 2 3 1 2

Current DTC (example)

FI indicator light

ON

OFF(Sec.)


RV125K7 (07-MODEL) 37

DTC INDICATION CHARTFLASHING PATTERN DTC No. MALFUNCTION PART REMARKS

00None

12CKP sensor (Page 44) Pick up coil signal

13IAP sensor (Page 47)

14TP sensor (Page 52)

15ET sensor (Page 57)

21IAT sensor (Page 61)

23TO sensor (Page 65)

24Ignition coil (Page 68)

32Fuel injector (Page 69)

*40ISC valve (Page 71)

42Ignition switch (Page 74)

44HO2 sensor (Page 75)

1 2

1 3

1 4

1 5

2 1

2 3

42

23

4 0

24

4 4


38 RV125K7 (07-MODEL)

*40C40 code has no first digit display. For this reason, the interval A between the displays as shown below islonger than the others.

SELF-DIAGNOSIS RESET PROCEDURE After repairing the trouble, turn OFF the ignition switch and

turn ON again. If the FI indicator light turns OFF, the malfunction is cleared. Disconnect the special tool from the dealer mode coupler.NOTE:* Even though the Current DTC is cleared, Past DTC (previous

malfunction history code) still remains stored in the ECM.Therefore, erase the Past DTC memorized in the ECM usingSDS.

* DTC is memorized in the ECM also when the wire coupler ofany sensor is disconnected. Therefore, when a wire couplerhas been disconnected at the time of diagnosis, erase thestored DTC (Past DTC) using SDS.

4 40 0

4.0 sec.

1.0 sec.

FI


RV125K7 (07-MODEL) 39

USE OF SDS DIAGNOSTIC PROCEDURESNOTE:* Do not disconnect the coupler from ECM, battery cable from

battery, ECM ground wire from engine or main fuse beforeconfirming the DTC (Diagnostic Trouble Code) stored in mem-ory. Such disconnection will erase the memorized informationin ECM memory.

* DTC stored in ECM memory can be checked by SDS.* Be sure to read PRECAUTIONS IN SERVICING (Page 13)

before inspection and observe what is written there.

Remove the right frame cover. (RV125K3 5-3) Set up the SDS tool. (Refer to the SDS operation manual for

further details.) Read the DTC (Diagnostic Trouble Code) and show data

when trouble (displaying data at the time of DTC) according toinstructions displayed on SDS.

SDS is not only used for detecting DTC but also for reproduc-ing and checking on screen the failure condition as describedby customers using the trigger.

How to use trigger. (Refer to the SDS operation manual forfurther details.) 09904-41010: SDS set tool

99565-01010-009: CD-ROM Ver. 9


40 RV125K7 (07-MODEL)

USE OF SDS DIAGNOSIS RESET PROCEDURE After repairing the trouble, turn OFF the ignition switch and

turn ON again. Click the DTC inspection button 1. Check the DTC. The previous malfunction history code (Past DTC) still

remains stored in the ECM. Therefore, erase the history codememorized in the ECM using SDS tool.

NOTE:The malfunction code is memorized in the ECM also when thewire coupler of any sensor is disconnected. Therefore, when awire coupler has been disconnected at the time of diagnosis,erase the stored malfunction history code using SDS.

Click Clear 2 to delete history code (Past DTC).

Follow the displayed instructions.

Check that both Current DTC 3 and Past DTC 4 aredeleted (NIL).


RV125K7 (07-MODEL) 41

SHOW DATA WHEN TROUBLE DISPLAING DATA AT THE TIME OF DTC)ECM stores the engine and driving conditions (in the form of data as shown in the figure) at the moment ofthe detection of a malfunction in its memory. This data is called Show data when trouble.Therefore, it is possible to know engine and driving conditions (e.g., whether the engine was warm or not,where the motorcycle was running or stopped) when a malfunction was detected by checking the show datawhen trouble. This show data when trouble function can record the maximum of two Diagnostic TroubleCodes in the ECM.Also, ECM has a function to store each show data when trouble for two different malfunctions in the order asthe malfunction is detected. Utilizing this function, it is possible to know the order of malfunctions that havebeen detected. Its use is helpful when rechecking or diagnosing a trouble.

Click Show data when trouble 1 to display the data. By clicking the drop down button 2, either Failure#1 or Failure #2 can be selected.


42 RV125K7 (07-MODEL)

DTC TABLE AND DEFECTIVE CONDITION

DTC No. DETECTED ITEM DETECTED FAILURE CONDITION CHECK FOR

00 NO FAULT

12 CKP sensor The CKP sensor signal does not reach ECM for 4 sec. or more, after receiving the IAP sensor signal.

CKP sensor wiring and mechan-ical partsCKP sensor, lead wire/coupler connectionP0335

13

IAP sensor The sensor should produce following voltage.0.2 V sensor voltage < 4.5 VIn other than the above range, 13 (P0105) is indicated.

IAP sensor, lead wire/coupler connection

P0105H

Sensor voltage is higher than specified value.

IAP sensor circuit open or shorted to VCC or ground circuit open

L Sensor voltage is lower than specified value.

IAP sensor circuit shorted to ground or VCC circuit open

14

TP sensor The sensor should produce following voltage.0.3 V sensor voltage < 4.7 VIn other than the above range, 14 (P0120) is indicated.

TP sensor, lead wire/coupler connection

P0120

H Sensor voltage is higher than specified value.

TP sensor circuit shorted to VCC or ground circuit open

LSensor voltage is lower than specified value.

TP sensor circuit open or shorted to ground or VCC circuit open

15

ET sensor The sensor voltage should be the fol-lowing.0.1 V sensor voltage < 4.7 VIn other than the above range, 15 (P0115) is indicated.

ET sensor, lead wire/coupler connection

P0115H Sensor voltage is higher than specified

value.ECT sensor circuit open or ground circuit open


ECT sensor circuit shorted to ground

21

IAT sensor The sensor voltage should be the fol-lowing.0.1 V sensor voltage < 4.6 VIn other than the above range, 21 (P0110) is indicated.

IAT sensor, lead wire/coupler connection

P0110H Sensor voltage is higher than specified

value.IAT sensor circuit open or ground circuit open


IAT sensor circuit shorted to ground


RV125K7 (07-MODEL) 43

DTC No. DETECTED ITEM DETECTED FAILURE CONDITION CHECK FOR

23

TO sensor The sensor voltage should be the fol-lowing for 2 sec. and more, after igni-tion switch is turned ON.0.2 V sensor voltage < 4.6 VIn other than the above value, 23 (P1651) is indicated.

TO sensor, lead wire/coupler connection

P1651

H Sensor voltage is higher than specified value.

TO sensor circuit shorted to VCC or ground circuit open

LSensor voltage is lower than specified value.

TO sensor circuit open or shorted to ground or VCC circuit open

24

Ignition signal

CKP sensor (pick-up coil) signal is pro-duced, but signal from ignition coil is interrupted 10 times or more continu-ously. In this case, the code 24 (P0351) is indicated.

Ignition coil, wiring/coupler con-nection, power supply from the battery

P0351

32Fuel injector CKP sensor (pickup coil) signal is pro-

duced, but fuel injector signal is inter-rupted 10 times or more continuously. In this case, the code 32 (P0201) is indicated.

Primary fuel injector, wiring/cou-pler connection, power supply to the injector

P0201

40

ISC valve When the ISC operation voltage remains at 1.0 V or lower continuously for 2 sec. or longer.Idle speed is higher than the normal condition.

ISC valve circuit open or shorted to groundPower source circuit open ISC valve is fixed to full openDisconnected ISC valve hoseP0505

42 Ignition switch

Ignition switch signal is not input to the ECM.

Ignition switch, lead wire/coupler, etc.P1650

44HO2 sensor HO2 sensor output voltage is not input

to ECM during engine operation and running condition.(Sensor voltage < 0.60 V)In other than the above value, 44 (P0130) is indicated.

HO2 sensor circuit open or shorted to ground

P0130

44 The Heater can not operate so that heater operation voltage is not supply to the oxygen heater circuit, 44 (P0135) is indicated.

HO2 sensor lead wire/coupler connectionBattery voltage supply to the HO2 sensorP0135


44 RV125K7 (07-MODEL)

12 (P0335) CKP SENSOR CIRCUIT MALFUNCTION

INSPECTIONStep 11) Turn the ignition switch OFF.2) Remove the seat. (RV125K3 5-3)3) Check the CKP sensor coupler 1 for loose or poor contacts.

If OK, then measure the CKP sensor resistance.

4) Disconnect the CKP sensor coupler and measure the resis-tance.

CKP sensor resistance: 172 288 (G Bl)

DETECTED CONDITION POSSIBLE CAUSEThe CKP sensor signal does not reach ECM for 4sec. or more, after receiving the IAP sensor signal.

Metal particles or foreign material being stuck on the CKP sensor and rotor tip

CKP sensor circuit open or short CKP sensor malfunction ECM malfunction

Generator

ECM

CKP sensor

To regulator/rectifier

CKPG

Bl

Bl

E2B/Br

1

1


RV125K7 (07-MODEL) 45

5) If OK, then check the continuity between each terminal andground. CKP sensor continuity: (Infinity)

(G Ground)(Bl Ground)

09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()

Are the resistance and continuity OK?

6) After repairing the trouble, clear the DTC using SDS tool.(Page 40)

Step 21) Crank the engine a few seconds with the starter motor, and

measure the CKP sensor peak voltage at the coupler.2) Repeat the above test procedure a few times and measure

the highest peak voltage. CKP sensor peak voltage: 2.0 V and more

(+ G - Bl)1 Peak volt adaptor

09900-25008: Multi-circuit tester set Tester knob indication: Voltage ()

YES Go to step 2.NO Replace the CKP sensor with a new one.

1

2V


46 RV125K7 (07-MODEL)

.

Is the voltage OK?


YES

Bl or B/Br wire open or shorted to ground. Loose or poor contacts on the CKP sensor cou-

pler or ECM coupler (terminal P or 4). If wire and connection are OK, intermittent trou-

ble or faulty ECM. Recheck each terminal and wire harness for

open circuit and poor connection. Replace the ECM with a known good one, and

inspect it again.

NO

Inspect that metal particles or foreign material stuck on the CKP sensor and rotor tip.

If there are no metal particles and foreign mate-rial, then replace the CKP sensor with a new one.

When using the multi-circuit tester, do not stronglytouch the terminal of the ECM coupler with a needlepointed tester probe to prevent the terminal damageor terminal bend.

2ECM coupler (Harness side)


RV125K7 (07-MODEL) 47

13 (P0105-H/L) IAP SENSOR CIRCUIT MALFUNCTION

NOTE:IAP sensor is incorporated in the TP sensor/IAT sensor.

INSPECTIONStep 1 (When indicating 13:)1) Turn the ignition switch OFF.2) Check the IAP sensor coupler 1 for loose or poor contacts.

If OK, then measure the IAP sensor input voltage.

DETECTED CONDITION POSSIBLE CAUSE13 IAP sensor voltage is not within the fol-

lowing range.0.2 V Sensor voltage < 4.5 VNOTE:Note that atmospheric pressure variesdepending on weather conditions aswell as altitude.Take that into consideration wheninspecting voltage.

Clogged vacuum passage between throttle body and IAP sensor.

Air being drawn from vacuum passage between throttle body and IAP sensor.

IAP sensor circuit open or shorted to ground. IAP sensor malfunction. ECM malfunction.

P0105 H Sensor voltage is higher than specified value.

IAP sensor circuit open or shorted to VCC or ground circuit open.

IAP sensor circuit shorted to ground or VCC cir-cuit open.L

Sensor voltage is lower than specified value.

ECMIAP sensor

B/Br

G/B

R VCC

IAP

E2

1


48 RV125K7 (07-MODEL)

3) Disconnect the IAP sensor coupler.4) Turn the ignition switch ON.5) Measure the voltage at the R wire and ground.6) If OK, then measure the voltage at the R wire and B/Br wire. IAP sensor input voltage: 4.5 5.5 V

(+ R - Ground) (+ R - B/Br)


Is the voltage OK?

Step 1 (When indicating P0105-H:)1) Turn the ignition switch OFF.2) Check the IAP sensor coupler 1 for loose or poor contacts.

If OK, then check the IAP sensor lead wire continuity.

3) Disconnect the IAP sensor coupler.4) Check the continuity between R wire and G/B wire.

If the sound is not heard from the tester, the circuit conditionis OK.

YES Go to Step 2.

NO Loose or poor contacts on the ECM coupler

(terminal 9 or 4). Open or short circuit in the R wire or B/Br wire.

V

1

1

1


RV125K7 (07-MODEL) 49

5) Disconnect the ECM coupler.6) Check the continuity between G/B wire C and terminal N.7) If OK, then check the continuity between B/Br wire B and ter-

minal 4. IAP sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set

09900-25009: Needle pointed probe set Tester knob indication: Continuity test ()

Is the continuity OK?


Step 1 (When indicating P0105-L:)1) Turn the ignition switch OFF.2) Check the IAP sensor coupler 1 for loose or poor contacts.

If OK, then check the IAP sensor lead wire continuity.

3) Disconnect the IAP sensor coupler.4) Check the continuity between G/B wire and ground.5) Also, check the continuity between G/B wire and B/Br wire. If

the sound is not heard from the tester, the circuit condition isOK.


YES Go to Step 2.NO G/B wire shorted to VCC, or B/Br wire open.

1 ?

ECM coupler (Harness side)

1

1


50 RV125K7 (07-MODEL)

6) Disconnect the ECM coupler.7) Check the continuity between R wire A and terminal 9.8) Also, check the continuity between G/B wire C and terminal

N.

IAP sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set





YES Go to Step 1 (Page 47) and go to Step 2.NO R or G/B wire open, or G/B wire shorted to ground

1 ?



RV125K7 (07-MODEL) 51

Step 21) Connect the IAP sensor coupler and ECM coupler.2) Insert the needle pointed probes to the lead wire coupler.3) Start the engine at idle speed and measure the IAP sensor

output voltage (between G/B and B/Br wires). IAP sensor output voltage: 2.0 3.5 V at idle speed

(+ G/B - B/Br) 09900-25008: Multi-circuit tester set

09900-25009: Needle pointed probe set Tester knob indication: Voltage ()

Is the voltage OK?


YES

G/B, R or B/Br wire open or shorted to ground, or poor N, 9 or 4 connection

If wire and connection are OK, intermittent trou-ble or faulty ECM.

Recheck each terminal and wire harness for open circuit and poor connection.

Replace the ECM with a known good one, and inspect it again.

NO Open or short circuit in the G/B wire If the wire are OK, replace the throttle body

assembly with a new one.


2V



52 RV125K7 (07-MODEL)

14 (P0120-H/L) TP SENSOR CIRCUIT MALFUNCTION

NOTE:TP sensor is incorporated in the IAP sensor/IAT sensor.

INSPECTIONStep 1 (When indicating 14:)1) Turn the ignition switch to OFF.2) Check the TP sensor coupler 1 for loose or poor contacts.

If OK, then measure the TP sensor input voltage.

DETECTED CONDITION POSSIBLE CAUSE14 Output voltage is not within the following

range.Difference between actual throttle open-ing and opening calculated by ECM is larger than specified value.0.3 V Sensor voltage < 4.7 V

TP sensor maladjusted TP sensor circuit open or short TP sensor malfunction ECM malfunction


TP sensor circuit shorted to VCC or ground circuit open

TP sensor circuit open or shorted to ground or VCC circuit openL


ECMTP sensor

B/Br

R

P TP sensor

E2

VCC

1


RV125K7 (07-MODEL) 53

3) Disconnect the TP sensor coupler.4) Turn the ignition switch ON.5) Measure the voltage at the R wire and ground.6) If OK, then measure the voltage at the R wire and B/Br wire. TP sensor input voltage: 4.5 5.5 V

(+ R - Ground)(+ R - B/Br)


Is the voltage OK?

Step 1 (When indicating P0120-H:)1) Turn the ignition switch OFF.2) Check the TP sensor coupler 1 for loose or poor contacts.

If OK, then check the TP sensor lead wire continuity.

3) Disconnect the TP sensor coupler.4) Check the continuity between P wire and R wire.

If the sound is not heard from the tester, the circuit conditionis OK.

YES Go to Step 2.


(terminal 9 or 4). Open or short circuit in the R wire or B/Br wire.

V

1

1

1


54 RV125K7 (07-MODEL)

5) Disconnect the ECM coupler.6) Check the continuity between P wire A and terminal M.7) Also, check the continuity between B/Br wire C and terminal

4.

TP sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set




Step 1 (When indicating P0120-L:)1) Turn the ignition switch OFF.2) Check the TP sensor coupler 1 for loose or poor contacts.

If OK, then check the TP sensor lead wire continuity.

3) Disconnect the TP sensor coupler.4) Check the continuity between P wire and ground.5) Also, check the continuity between P wire and B/Br wire. If the

sound is not heard from the tester, the circuit condition is OK.


YES Go to Step 2.NO P wire shorted to VCC, or B/Br wire open

1 ?


1

1


RV125K7 (07-MODEL) 55

6) Disconnect the ECM coupler.7) Check the continuity between P wire A and terminal M.8) Also, check the continuity between R wire B and terminal 9. TP sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set





YES Go to Step 1 (Page 52) and go to Step 2.NO R wire or P wire open, or P wire shorted to ground

1 ?



56 RV125K7 (07-MODEL)

Step 21) Connect the TP sensor coupler.2) Turn the ignition switch ON.3) Measure the TP sensor output voltage (between + P and -

B/Br) by turning the throttle grip. TP sensor output voltage

Throttle valve is closed: Approx. 0.7 VThrottle valve is opened: Approx. 3.9 V

09900-25008: Multi-circuit tester set09900-25009: Needle pointed probe set Tester knob indication: Voltage ()

Is the voltage OK?


3

V

YES

P, R or B/Br wire open or shorted to ground, or poor M, 9 or 4 connection




NO If check result is not satisfactory, replace the throt-tle body assembly with a new one.




RV125K7 (07-MODEL) 57

15 (P0115-H/L) ET SENSOR CIRCUIT MALFUNCTION

INSPECTIONStep 1 (When indicating 15:)1) Turn the ignition switch OFF.2) Check the ET sensor coupler 1 for loose or poor contacts.

If OK, then measure the ET sensor voltage at the coupler.

3) Disconnect the coupler and turn the ignition switch ON.4) Measure the voltage between O wire terminal A and ground.5) If OK, then measure the voltage between O wire terminal A

and B/Br wire terminal B. ET sensor voltage: 4.5 5.5 V

(+ O - Ground) (+ O - B/Br)


Is the voltage OK?

DETECTED CONDITION POSSIBLE CAUSE15 Output voltage is not within the following

range.0.1 V Sensor voltage < 4.7 V

ET sensor circuit open or short ET sensor malfunction ECM malfunction


ET sensor circuit open or ground circuit open

ET sensor circuit shorted to groundL Sensor voltage is lower than specified

value.

ECM

E2

ET

B

B O

ET sensor

B/Br

1

YES Go to Step 2. Loose or poor contacts on the ECM coupler

1VNO (terminal K or 4). Open or short circuit in the O wire or B/Br wire


58 RV125K7 (07-MODEL)

Step 1 (When indicating P0115-H:)1) Turn the ignition switch OFF.2) Check the ET sensor coupler 1 for loose or poor contacts.

If OK, then check the ET sensor lead wire continuity.

3) Disconnect the ET sensor coupler and ECM coupler.4) Check the continuity between O wire A and terminal K.5) Also, check the continuity between B/Br wire B and terminal

4.

ET sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set




1


YES Go to Step 2.NO O or B/Br wire open


1 ?


RV125K7 (07-MODEL) 59

Step 1 (When indicating P0115-L:)1) Turn the ignition switch OFF.2) Check the ET sensor coupler 1 for loose or poor contacts.

If OK, then measure the output voltage.

3) Disconnect the ET sensor coupler.4) Check the continuity between O wire A and ground.

If the sound is not heard from the tester, the circuit conditionis OK. Tester knob indication: Continuity test ()

Are the continuity and voltage OK?


1

1?

YES Go to Step 2.

NO O wire shorted to ground If wire is OK, go to Step 2.


60 RV125K7 (07-MODEL)

Step 21) Turn the ignition switch OFF.2) Disconnect the ET sensor coupler.3) Measure the ET sensor resistance between B wires. ET sensor resistance: Approx. 5 13 k at 20 40 C

(B B) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()

Refer to page 79 for details.

Is the resistance OK?

4) After repairing the trouble, clear the DTC using SDS tool.(Page 40) ET sensor specification

YES

O or B/Br wire open or shorted to ground, or poor K or 4 connection.




NO Replace the ET sensor with a new one.


Engine temperature Resistance20 C Approx. 13.0 k40 C Approx. 6.2 k80 C Approx. 1.7 k

100 C Approx. 1.0 k

2



RV125K7 (07-MODEL) 61

21 (P0110-H/L) IAT SENSOR CIRCUIT MALFUNCTION

NOTE:IAT sensor is incorporated in the IAP sensor/TP sensor.

INSPECTIONStep 1 (When indicating 21:)1) Turn the ignition switch OFF.2) Check the IAT sensor coupler 1 for loose or poor contacts.

If OK, then measure the IAT sensor voltage at the wire sidecoupler.

3) Disconnect the IAT sensor coupler and turn the ignition switchON.

DETECTED CONDITION POSSIBLE CAUSE21 (P0110)

Output voltage is not within the following range.0.1 Sensor voltage 4.6 V

IAT sensor circuit open or short. IAT sensor malfunction. ECM malfunction.


IAT sensor circuit open or ground circuit open.

IAT sensor circuit shorted to ground.L Sensor voltage is lower than specified

value.

ECMIAT sensor

B/Br

R

E2

VCC

IATDg

1


62 RV125K7 (07-MODEL)

4) Measure the voltage between Dg wire terminal and ground.5) Also, measure the voltage between Dg wire terminal and B/Br

wire terminal. IAT sensor input voltage: 4.5 5.5 V

(+ R - Ground)(+ R - B/Br)


Is the voltage OK?

Step 1 (When indicating P0110-H:)1) Turn the ignition switch OFF.2) Check the IAT sensor coupler for loose or poor contacts.

If OK, then check the IAT sensor lead wire continuity.

3) Disconnect the IAT sensor coupler and ECM coupler.4) Check the continuity between Dg wire A and terminal L.5) Also, check the continuity between B/Br wire B and terminal

4.

IAT sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set



6) After repairing the trouble, clear the DTC using SDS tool.

YES Go to Step 2.


(Terminal L or 4). Open or short circuit in the Dg wire or B/Br wire.

1V

1


1 ?


YES Go to Step 2.NO Dg wire or B/Br wire open(Page 40)


RV125K7 (07-MODEL) 63

Step 1 (When indicating P0110-L:)1) Turn the ignition switch OFF.2) Check the IAT sensor coupler for loose or poor contacts.

If OK, then check the IAT sensor lead wire continuity.

3) Disconnect the IAT sensor coupler.4) Check the continuity between Dg wire and ground. If the

sound is not heard from the tester, the circuit condition is OK. Tester knob indication: Continuity test ()

5) Connect the IAT sensor coupler and turn the ignition switchON.

6) Measure the voltage between Dg wire A and ground. IAT sensor output voltage: Approx. 2.5 V at 23 C

Approx. 1.8 V at 40 C(+ Dg - Ground)


Are the continuity and voltage OK?


1

1?

YES Go to Step 2.

NO Dg wire shorted to ground If wire is OK, go to Step 2.

1

V


64 RV125K7 (07-MODEL)

Step 21) Turn the ignition switch OFF.2) Measure the IAT sensor resistance. IAT sensor resistance: Approx. 2.56 k at 20 C

Approx. 1.20 k at 40 C(Terminal Terminal)

09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()


2

YES

Dg or B/Br wire open or shorted to ground, or poor L or 4 connection.




NO Replace the throttle body assembly with a new one.



RV125K7 (07-MODEL) 65

23 (P1651-H/L) TO SENSOR CIRCUIT MALFUNCTION

INSPECTIONStep 1 (When indicating 23:)1) Turn the ignition switch OFF.2) Remove the right frame cover. (RV125K3 5-3)3) Check the TO sensor coupler 1 for loose or poor contacts.

If OK, then measure the TO sensor resistance.4) Disconnect the TO sensor coupler.

5) Measure the resistance between terminal A and terminal C. TO sensor resistance: 16.5 22.3 k

(Terminal A Terminal C) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()


DETECTED CONDITION POSSIBLE CAUSE23 The sensor voltage should be the follow-

ing for 2 sec. and more, after ignition switch is turned ON.0.2 V Sensor voltage < 4.6 V

TO sensor circuit open or short TO sensor malfunction ECM malfunction


TO sensor circuit shorted to VCC or ground circuit open

TO sensor circuit open or shorted to ground or VCC circuit openL


ECM

E2

TOS

R

B/Br

VCC

TO sensor

Br/W

1

YES Go to Step 2.NO Replace the TO sensor with a new one.

1


66 RV125K7 (07-MODEL)

Step 1 (When indicating P1651-H:)1) Turn the ignition switch OFF.2) Remove the right frame cover.3) Check the TO sensor coupler 1 for loose or poor contacts.

If OK, then check the TO sensor lead wire continuity.

4) Disconnect the TO sensor coupler.5) Check the continuity between R wire A and Br/W wire B.

If the sound is not heard from the tester, the circuit condition isOK.

6) Disconnect the ECM coupler.7) Check the continuity between Br/W wire B and terminal A.8) Also, check the continuity between B/Br wire C and terminal 4. TO sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set




1

1

?


YES Go to Step 2.NO Br/W wire shorted to VCC, or B/Br wire open.


1


RV125K7 (07-MODEL) 67

Step 1 (When indicating P1651-L:)1) Turn the ignition switch OFF.2) Remove the right frame cover.3) Check the TO sensor coupler 1 for loose or poor contacts.

If OK, then check the TO sensor lead wire continuity.

4) Disconnect the TO sensor coupler.5) Check the continuity between Br/W wire B and ground.6) Also, check the continuity between Br/W wire B and B/Br

wire C. If the sound is not heard from the tester, the circuitcondition is OK.

7) Disconnect the ECM coupler.8) Check the continuity between R wire A and terminal 9.9) Also, then check the continuity between Br/W wire B and ter-

minal A. TO sensor lead wire continuity: Continuity () 09900-25008: Multi-circuit tester set



10)After repairing the trouble, clear the DTC using SDS tool.(Page 40)

1

1

?


YES Go to Step 2.

NO R or Br/W wire open, or Br/W wire shorted to ground.


1


68 RV125K7 (07-MODEL)

Step 21) Connect the TO sensor coupler and ECM coupler.2) Insert the needle pointed probes to the lead wire coupler.3) Turn the ignition switch ON.4) Measure the voltage between Br/W and B/Br wires. TO sensor voltage (Normal): 0.4 1.4 V

(+ Br/W - B/Br)

Also, measure the voltage as the motorcycle is leaned.5) Dismount the TO sensor from its bracket and measure the

voltage when it is leaned 65, left and right. TO sensor voltage (Leaning): 3.7 4.4 V

(+ Br/W - B/Br) 09900-25008: Multi-circuit tester set

09900-25009: Needle pointed probe set Tester knob indication: Voltage ()

Is the voltage OK?


24 (P0351) IGNITION SYSTEM MALFUNCTION* Refer to the IGNITION SYSTEM for details. (RV125K3 6-18)

2

V

V

2

65

YES

R, Br/W or B/Br wire open or shorted to ground, or poor 9, A or 4 connection




NO Loose or poor contacts on the ECM coupler Open or short circuit Replace the TO sensor with a new one.




RV125K7 (07-MODEL) 69

32 (P0201) FUEL INJECTOR CIRCUIT MALFUNCTIONNOTE:When the ignition switch is turned to ON position, the fuel injec-tor starts to operate approx. 2 sec. as purge operation (initialoperation)

INSPECTIONStep 11) Turn the ignition switch OFF.2) Check the fuel injector coupler 1 for loose or poor contacts.

If OK, then measure the fuel injector resistance.3) Disconnect the fuel injector coupler.

4) Measure the fuel injector resistance. Fuel injector resistance: Approx. 1.9 at 20 C

(Terminal Terminal)

DETECTED CONDITION POSSIBLE CAUSEWhen the fuel injector current in each detection is low for consecutive10 times or more.

Fuel injector circuit open or short Fuel injector malfunction ECM malfunction

Fuel injector

Fuel injector

R/W

Fuel injector

ECM

W/Bl

1

1


70 RV125K7 (07-MODEL)

5) If OK, then check the continuity between each terminal andground. Fuel injector continuity: (Infinity)

(Terminal Ground) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()


6) After repairing the trouble, clear the DTC using the SDS tool.(Page 40)

Step 21) Turn the ignition switch ON.2) Measure the fuel injector voltage between R/W wire and

ground. Fuel injector voltage: (Battery voltage 1.0 V) and more

(+ R/W - Ground)NOTE:(Ex.) It is possible that 11.5 V measured when the battery volt-age is 12.5 V. 09900-25008: Multi-circuit tester set Tester knob indication: Voltage ()

Is the voltage OK?

YES Go to Step 2.

NO Replace the fuel injector with a new one.(Page 88)

YES

R/W or W/Bl wire open or shorted to ground, poor H or F connection.

If wire and connection is OK, intermittent trou-ble or faulty ECM.



NO Open circuit in the R/W wire or ECM malfunction.


1

V2

2ECM coupler (Harness side)3) After repairing the trouble, clear the DTC using SDS tool.(Page 40)


RV125K7 (07-MODEL) 71

40 (P0505) ISC VALVE CIRCUIT MALFUNCTION

INSPECTIONStep 11) Turn the ignition switch OFF.2) Check the ISC valve coupler 1 for loose or poor contacts.

If OK, then check the ISC valve resistance.3) Disconnect the ISC valve coupler.

4) Measure the ISC valve resistance. ISC valve resistance: Approx. 35

(Terminal Terminal)

DETECTED CONDITION POSSIBLE CAUSE40(P0505)

When the ISC operation voltage remains at 1.0 V or lower continuously for 2 sec. or longer.Idle speed is higher than the normal condition.

ISC valve circuit open or shorted to ground ISC valve malfunction ECM malfunction

Ignition SWECM

B/O To regulator/rectifier

ISC valve

Battery

20 AISC Y/R

1

1


72 RV125K7 (07-MODEL)

5) If OK, then check the continuity between each terminal andground. ISC valve continuity: (Infinity)

(Terminal Ground) 09900-25008: Multi-circuit tester set Tester knob indication: Resistance ()



Step 21) Turn the ignition switch ON.2) Measure the ISC valve voltage between B/O wire and ground. ISC valve voltage: Battery voltage

(+ B/O - Ground) 09900-25008: Multi-circuit tester set Tester knob indication: Voltage ()

Is the voltage OK?


YES Go to Step 2.

NO Replace the ISC valve with a new one.(Page 88)

1

2V

YES

B/O or Y/R wire open or shorted to ground, or poor 2 connection

If wire and connection is OK, intermittent trou-ble or faulty ECM.



NO Open circuit in the B/O wire




RV125K7 (07-MODEL) 73

ACTIVE CONTROL INSPECTION (ISC RPM CONTROL)Check 11) Set up the SDS tool. (Refer to the SDS operation manual for

further details.)2) Check that the engine is running.3) Make sure that the engine temperature on data monitor is

indicated 80 C or more.4) Click the Active control.5) Click the ISC rpm control 1.

6) Check that the Spec 2 is idle speed 1 500 100 rpm.7) Check that the Desired idle speed 3 is within the specified

idle rpm.

Check 21) Click the button 1 and decrease the Spec 2 to 1 000 rpm

slowly.2) Check that the Desired idle speed 3 is nearly equal to the

Spec 2. At the same time, check that the air volume of theISC duty decreases.

3) Click the button 4 and increase the Spec 2 slowly.4) Check that the Desired idle speed 3 is nearly equal to the

Spec 2. Also, check that the air volume 5 of the ISC dutyincreases.


74 RV125K7 (07-MODEL)

Check 31) Click the button 1 and increase the Spec 2 to 1 300 rpm

slowly.2) Check that the Desired idle speed 3 is nearly equal to the

Spec 2. Also, check that the air volume 4 of the ISC dutyincreases.

Check 41) Increase the Spec 1 to 1 900 rpm.2) Check that the Desired idle speed 2 is approx. 1 900 rpm.3) Check that the Engine speed 3 is close to 1 900 rpm.NOTE:Be careful not to increase the Spec to more than 3 000 rpm, orthe Engine speed may reach the upper limit.

If the ISC valve does not function properly, replace the ISC valve (Page 88) or inspect the ISC valve(Page 91).

42 (P01650) IG SWITCH CIRCUIT MALFUNCTION* Refer to the RV125K3 6-28 for details.


RV125K7 (07-MODEL) 75

44 (P0130/P0135) HO2 SENSOR (HO2S) CIRCUIT MALFUNCTION

INSPECTIONStep 1 (When indicating 44/P0130:)1) Turn the ignition switch OFF.2) Remove the seat. 3) Check the HO2 sensor coupler 1 for loose or poor contacts.

If OK, then check the HO2 sensor lead wire continuity.

4) Disconnect the HO2 sensor coupler.5) Check the continuity between W/G wire A and ground.6) Also, check the continuity between W/G wire A and B/Br wire

B. If the sound is not heard from the tester, the circuit condi-tion is OK. 09900-25008: Multi-circuit tester set Tester knob indication: Continuity test ()

DETECTED CONDITION POSSIBLE CAUSE44(P0130)

HO2 sensor output voltage is not input to ECM during engine operation and running condition.(Sensor voltage < 0.60 V)

HO2 sensor circuit open or shorted to ground. Fuel system malfunction. ECM malfunction.

44(P0135)

The heater can not operate so that heater operation voltage is not supply to the oxygen heater circuit.

Battery voltage supply to the HO2 sensor.

ECM

Side-stand relay

Ignition switch

Engine stop switch

B/O

WGrBW

B/BrW/G

W

HO2 sensor

HO2SHO2. H

E2

To side-stand switch

1

1 ?


76 RV125K7 (07-MODEL)

7) Disconnect the ECM coupler.8) Check the continuity between W/G w

suzuki rv125 k7 supp manual

Documents

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