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206-09-1 206-09-1Vehicle Dynamic Systems

DIAGNOSIS AND TESTING

The ABS module is self-monitoring. When theAnti-Lock Controlignition switch is turned to the run position, the

Special Tool(s) ABS module does a preliminary electrical checkand, at approximately 12 km/h (8 mph), the pumpVehicle Communication Modulemotor is turned on for approximately one(VCM) and Integrated

Diagnostic System (IDS) half-second. Any malfunction of the ABS causessoftware with appropriate the ABS to shut OFF and the yellow ABS warninghardware, or equivalent scan indicator to illuminate, however normal powertool

assisted braking remains.

The traction control system controls wheelspin by73III Digital Multi-meter modulating engine torque and by applying and105-R0057 or equivalent releasing the appropriate rear brake to restore

traction when driving on slippery or loose surfaces.

The traction control system can be disabled bypressing the traction control switch and is indicatedby an indicator lamp in the traction control switch.The traction control will reset and return to normal

Flex Probe Kit traction assist when the ignition switch is cycled or418-F090 (105-R025B) or

when the traction control switch is pressed andequivalentreleased a second time.

Inspection and Verification1. Verify the customer concern.

2. Verify the stoplamps operate correctly byPrinciples of Operation applying and releasing the brake pedal with the

ignition switch in the OFF position. If theThe anti-lock brake system (ABS) module receivesstoplamps do not operate correctly, refer towheel speed readings from each wheel speed sensorSection 417-01. If the stoplamps operateand processes this information to determine if ancorrectly, proceed to the next step.ABS event is necessary. The wheel speed sensor

electrically senses each tooth of the wheel speed 3. Visually inspect for obvious signs ofsensor indicators as it passes through the wheel mechanical or electrical damage:speed sensor’s magnetic field.

Visual Inspection ChartThe ABS module continuously monitors and

Mechanical Electricalcompares the rotational speed of each wheel and,when it detects an impending wheel lock, modulates • Brake fluid level • Bussed electrical centerhydraulic brake pressure to the appropriate brake • Tire inflation (BEC) fuse(s):

• Wheel and tire sizes — 8 (40A)caliper. This is accomplished by the ABS module• Steering components — 65 (30A)triggering the hydraulic control unit (HCU) to open

and suspension • Smart junction boxand close the appropriate solenoid valves. Once thecomponents (SJB) fuse 18 (10A)

affected wheel returns to normal speed, the ABS • Base brake system • Circuitrymodule returns the solenoid valves to their normal • Wheel speed sensor ring • Brake fluid level switch

• HCU • Stoplamp switchposition and normal (base) braking resumes.• Wheel speed sensor• Anti-lock brake system

(ABS) module• Traction control switch

4. If an obvious cause for an observed or reportedconcern is found, correct the cause (if possible)before proceeding to the next step.

Copyright 2006, Ford Motor CompanyLast updated: 6/19/2006 2007 Mustang, Mustang GT 8/2006


DIAGNOSIS AND TESTING (Continued)

5. NOTE: Make sure to use the latest scan tool • refer to Section 418-00 to diagnose nosoftware release. response from the powertrain control module

(PCM).If the cause is not visually evident, connect thescan tool to the data link connector (DLC). 8. Carry out the network test.

6. NOTE: The vehicle communication module • If the scan tool responds with no(VCM) LED prove out confirms power and communication for one or more modules,ground from the DLC are provided to the refer to Section 418-00.VCM. • If the network test passes, retrieve andIf the scan tool does not communicate with the record continuous memory diagnosticVCM: trouble codes (DTCs).

• check the VCM connection to the vehicle. 9. Clear the continuous DTCs and carry out theself-test diagnostics for the anti-lock brake• check the scan tool connection to the VCM.system (ABS) module.

• refer to Section 418-00, No Power To The10. If the DTCs retrieved are related to the concern,Scan Tool, to diagnose no communication

go to the Anti-Lock Brake System (ABS)with the scan tool.Module Diagnostic Trouble Code (DTC) Chart.

7. If the scan tool does not communicate with the For all other DTCs, refer to Section 419-10.vehicle:

11. If no DTCs related to the concern are retrieved,• verify the ignition key is in the ON position. GO to Symptom Chart.• verify the scan tool operation with a known

good vehicle.

Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Chart

DTC Description Source Action

B1317 Battery Voltage High ABS Module GO to Pinpoint Test A.

B1318 Battery Voltage Low ABS Module GO to Pinpoint Test A.

NOTE: If other DTCs are present, repairB1342 ECU is Faulted ABS Modulethem before installing a new module.CLEAR the DTCs. RETRIEVE theDTCs. If DTC B1342 is retrieved again,INSTALL a new ABS module. REFERto Anti-Lock Brake System (ABS)Module in this section. REPEAT theself-test.

C1093 Traction Control Disable Switch Circuit Instrument GO to Pinpoint Test H.Failure Cluster

C1095 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test B.Failure

C1096 ABS Hydraulic Pump Motor Circuit ABS Module GO to Pinpoint Test B.Open

C1115 ABS Power Relay Output Short Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. Ifto Battery DTC C1115 is retrieved again, INSTALL

a new ABS module. REFER toAnti-Lock Brake System (ABS) Modulein this section. CARRY OUT theself-test with the brake pedal notapplied.

C1145 Wheel Speed Sensor RF Input Circuit ABS Module GO to Pinpoint Test C.Failure

2007 Mustang, Mustang GT 8/2006



Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Chart (Continued)


C1155 Wheel Speed Sensor LF Input Circuit ABS Module GO to Pinpoint Test C.Failure

C1165 Wheel Speed Sensor RR Input Circuit ABS Module GO to Pinpoint Test C.Failure

C1175 Wheel Speed Sensor LR Input Circuit ABS Module GO to Pinpoint Test C.Failure

C1185 ABS Power Relay Output Circuit Failure ABS Module CLEAR all DTCs. If DTC C1185 isretrieved again, INSTALL a new ABSmodule. REFER to Anti-Lock BrakeSystem (ABS) Module in this section.CARRY OUT the self-test with the brakepedal not applied.

C1194 ABS Outlet Valve Coil LF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure DTC C1194 is retrieved again, INSTALL


C1198 ABS Inlet Valve Coil LF Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. IfDTC C1198 is retrieved again, INSTALLa new ABS module. INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1210 ABS Outlet Valve Coil RF Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure DTC C1210 is retrieved again, INSTALL

a new ABS module. INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1214 ABS Inlet Valve Coil RF Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. IfDTC C1214 is retrieved again, INSTALLa new ABS module. INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1222 Wheel Speed Mismatch ABS Module GO to Pinpoint Test D.

C1233 Wheel Speed LF Input Signal Missing ABS Module GO to Pinpoint Test D.

C1234 Wheel Speed RF Input Signal Missing ABS Module GO to Pinpoint Test D.

C1235 Wheel Speed RR Input Signal Missing ABS Module GO to Pinpoint Test D.

C1236 Wheel Speed LR Input Signal Missing ABS Module GO to Pinpoint Test D.






C1242 ABS Outlet Valve Coil LR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure DTC C1242 is retrieved again, INSTALL


C1246 ABS Outlet Valve Coil RR Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure DTC C1246 is retrieved again, INSTALL


C1250 ABS Inlet Valve Coil LR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. IfDTC C1250 is retrieved again, INSTALLa new ABS module. INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1254 ABS Inlet Valve Coil RR Circuit Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. IfDTC C1254 is retrieved again, INSTALLa new ABS module. INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1329 ABS Valve Outlet Coil Over RF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1329 is retrieved again, INSTALL


C1330 ABS Valve Outlet Coil Over LR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1330 is retrieved again, INSTALL


C1331 ABS Valve Outlet Coil Over RR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1331 is retrieved again, INSTALL







C1332 ABS Valve Outlet Coil Over LF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1332 is retrieved again, INSTALL


C1333 ABS Valve Inlet Coil Over RF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1333 is retrieved again, INSTALL


C1334 ABS Valve Inlet Coil Over LR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1334 is retrieved again, INSTALL


C1335 ABS Valve Inlet Coil Over RR ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1335 is retrieved again, INSTALL


C1336 ABS Valve Inlet Coil Over LF ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1336 is retrieved again, INSTALL


C1404 Traction Control Valve Rear Circuit ABS Module CLEAR all DTCs. DRIVE the vehicle. IfFailure DTC C1404 is retrieved again, INSTALL


C1446 Brake Switch Circuit Failure ABS Module GO to Pinpoint Test F.

C1527 ABS TC Valve Inlet Coil Over ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1527 is retrieved again, INSTALL







C1531 ABS TC Valve Outlet Coil Over ABS Module CLEAR all DTCs. DRIVE the vehicle. IfTemperature DTC C1531 is retrieved again, INSTALL


C1730 Reference Voltage Out of Range (+5 V) ABS Module If any other DTC(s) are present,DIAGNOSE those DTC(s) first. CLEARall DTCs. DRIVE the vehicle. If theDTC is still present, INSTALL a newABS module. REFER to Anti-LockBrake System (ABS) Module in thissection. CARRY OUT the self-test withthe brake pedal not applied.

C1958 ABS TC Valve Outlet Coil Failure ABS Module CLEAR all DTCs. DRIVE the vehicle. IfDTC C1958 is retrieved again, INSTALLa new ABS module. REFER toAnti-Lock Brake System (ABS) Modulein this section. CARRY OUT theself-test with the brake pedal notapplied.

U0073 CAN Bus Off — Transmit Error ABS Module REFER to Section 418-00.

U1900 CAN Communication Bus Fault — ABS Module REFER to Section 418-00.Receive Error

U2011 Module Transmitted Invalid Data ABS Module VERIFY powertrain control module(PCM) configuration. If PCM is notcorrectly configured, CONFIGURE thePCM. If the PCM is correctly configured,REFER to Section 418-00.

Symptom Chart

Symptom Chart

Condition Possible Sources Action• No communication with the • Circuitry • Refer to Section 418-00 to

anti-lock brake system (ABS) • ABS module diagnose the nomodule communications problem.

• No communication with the • Circuitry • Refer to Section 418-00 toinstrument cluster • Instrument cluster diagnose the no

communication problem.• The red brake warning • Circuitry • Refer to Section 413-01 to

indicator does not self-check • Instrument cluster continue diagnosis of the redbrake warning indicator.

• The red brake warning • Base brake system • Refer to Section 413-01 toindicator stays on when the • Circuitry continue diagnosis of the redignition is in RUN • Low brake fluid warning brake warning indicator.

switch• Parking brake switch• Anti-lock brake system (ABS)

module• Instrument cluster




Symptom Chart (Continued)

Condition Possible Sources Action• The yellow anti-lock brake • Circuitry • Refer to Section 413-01 to

system (ABS) warning • Instrument cluster continue diagnosis of theindicator does not self-check yellow brake warning

indicator.• Spongy/soft/low brake pedal • Air in brake hydraulic system • GO to Pinpoint Test F.

with no warning indicator • Base brake system• Hydraulic control unit (HCU)

• Poor vehicle tracking during • Tire pressure • Refer to Section 206-00 toanti-lock function • Air in the brake system continue diagnosis of the

• Base brake system brake system.• Hydraulic control unit (HCU) • GO to Pinpoint Test G.

• The traction control is • Circuitry • Install a new ABS module.inoperative • Traction control switch Refer to Anti-Lock Brake

• Anti-lock brake system (ABS) System (ABS) Module in thismodule section.

• The traction control system • Circuitry • GO to Pinpoint Test H.cannot be disabled • Traction control switch

• Instrument cluster• Anti-lock brake system (ABS)

module• The traction control switch • Circuitry • GO to Pinpoint Test I.

indicator is never/always on • Traction control switch• Anti-lock brake system (ABS)

module• Instrument cluster

Possible CausesPinpoint Tests• Fuse(s)Pinpoint Test A: DTCs B1317 and B1318 —

Battery Voltage High/Low • Circuit open

Refer to Wiring Diagrams Cell 42, Vehicle • Charging systemDynamic Systems for schematic and connector • Anti-lock brake system (ABS) moduleinformation.

Normal OperationThe vehicle electrical system voltage supplied iswithin the range of 10-16 volts. Above or belowthat voltage range, the DTC B1317 (Battery VoltageHigh) or the DTC B1318 (Battery Voltage Low)will be set.

Fused ignition voltage is supplied to the anti-lockbrake system (ABS) module from smart junctionbox (SJB) fuse 18 (10A) along circuit 1844(LG/RD), bussed electrical center (BEC) fuse 65(30A) along circuit 601 (LB/BK) and BEC fuse 8(40A) along circuit 534 (YE/LG). Ground isprovided along circuit 1205 (BK). There are 2ground circuits, both share the same circuit numberand wire color.



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST A: DTCs B1317 AND B1318 — BATTERY VOLTAGE HIGH/LOW

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to thewiring terminals. Do not use standard multi-meter probes.

Test Step Result / Action to TakeA1 CHECK THE BATTERY VOLTAGE

• Measure the battery voltage between the positive and negative Yesbattery terminals with: GO to A2.— the key ON and the engine OFF (KOEO).— the engine running. No

• Is the battery voltage between 10 and 13 volts with KOEO, REFER to Section 414-00 to continueand between 13 and 17 volts with the engine running? diagnosis of the charging system.

A2 CHECK VOLTAGE TO THE ABS MODULE• Key in OFF position.• Disconnect: ABS Module C135.• Key in ON position.• Measure the voltage between ground and:

— ABS module C135-2, circuit 601 (LB/PK), harness side.— ABS module C135-32, circuit 1844 (LG/RD), harness side.

YesGO to A3.NoVERIFY SJB fuse 18 (10A) is OK. If OK,REPAIR circuit 1844 (LG/RD).VERIFY BEC fuse 65 (30A) is OK. If OK,REPAIR circuit 601 (LB/PK).CLEAR the DTCs. CARRY OUT the

• Are the voltages greater than 10 volts? self-test with the brake pedal not applied.A3 CHECK THE ABS MODULE GROUND

• Key in OFF position.• Measure the resistance between ground and:

— ABS module C135-45, circuit 1205 (BK), harness side.— ABS module C135-16, circuit 1205 (BK), harness side.

YesGO to A4.NoREPAIR the affected circuit(s). REPEAT

• Are the resistances less than 5 ohms? the self-test.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST A: DTCs B1317 AND B1318 — BATTERY VOLTAGE HIGH/LOW (Continued)

Test Step Result / Action to TakeA4 CHECK FOR CORRECT ABS MODULE OPERATION

• Disconnect: ABS Module C135. Yes• Check for: INSTALL a new ABS module. REFER to

Anti-Lock Brake System (ABS) Module in— corrosion. this section. CLEAR the DTCs. REPEAT— spread terminals. the self-test.— pushed-out pins.• Connect the ABS module connector and make sure it seats No

correctly. The system is operating correctly at this• Operate the system and verify the concern is still present. time. The concern may have been caused• Is the concern still present? by a loose or corroded connector. CLEAR

the DTCs. CARRY OUT the self-test withthe brake pedal not applied.

Pinpoint Test B: DTCs C1095 and C1096 — Fused battery voltage is supplied from the bussedABS Hydraulic Pump Motor Circuit electrical center (BEC) fuse 8 (40A) along circuitFailure/Open 534 (YE/LG). Ground is provided along circuit

1205 (BK).Refer to Wiring Diagrams Cell 42, VehicleDynamic Systems for schematic and connector Possible Causesinformation.

• FuseNormal Operation

• Circuit openAnti-lock brake system (ABS) diagnostic trouble

• Hydraulic pump motorcode (DTC) C1095 sets only when the motor isinitially commanded on for 100 ms (+/-6 ms) and • Anti-lock brake system (ABS) modulethe ABS hydraulic pump motor is then commandedoff and the voltage back is read after 6 ms. If thevoltage indicates the motor is spinning at less than500 rpm, there may be a locked motor. If thiscondition is detected 4 times, then a locked motorDTC C1095 is set. The pump motor is checked foran open circuit 2 seconds after the most recentsuccessful pump motor off command. If the pumpmotor feedback remains greater than 0.75 volt formore than 50 ms (+/-6 ms) after these conditionshave been met, then DTC C1096 is set.

PINPOINT TEST B: DTCs C1095 AND C1096 — ABS HYDRAULIC PUMP MOTOR CIRCUITFAILURE/OPEN


Test Step Result / Action to TakeB1 CHECK THE ABS PUMP MOTOR

• Key in ON position. Yes• Is the ABS pump motor running all the time? INSTALL a new ABS module and

hydraulic control unit (HCU). REFER toAnti-Lock Brake System (ABS) Moduleand Hydraulic Control Unit (HCU) in thissection. CLEAR the DTCs. REPEAT theABS self-test.NoGO to B2.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST B: DTCs C1095 AND C1096 — ABS HYDRAULIC PUMP MOTOR CIRCUIT

FAILURE/OPEN (Continued)

Test Step Result / Action to TakeB2 CHECK THE PUMP MOTOR OPERATION

• Trigger the ABS module pump motor ON active command. Yes• Does the ABS pump motor run for approximately 2 CLEAR the DTCs. CHECK the yellow ABS

seconds? warning indicator while driving the vehicle(brakes must not be applied) above 32km/h (20 mph). If the yellow ABS warningindicator illuminates, RETRIEVE theDTCs. If DTC C1096 is retrieved, GO toB5.If DTC C1095 is retrieved, INSTALL a newHCU. REFER to Hydraulic Control Unit(HCU) in this section. CLEAR the DTCs.REPEAT the self-test.NoTRIGGER the ABS module pump motorOFF active command. GO to B3.

B3 CHECK CIRCUIT 534 (YE/LG) FOR AN OPEN• Disconnect: ABS Module C135.• Measure the voltage between ABS module C135-31, circuit 534

(YE/LG), harness side and ground.

YesGO to B4.NoVERIFY BEC fuse 8 (40A) is OK. If OK,REPAIR circuit 534 (YE/LG). CLEAR the

• Is the voltage greater than 10 volts? DTCs. REPEAT the self-test.B4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN

• Key in OFF position.• Measure the resistance between ground and:

— ABS module C135-45, circuit 1205 (BK), harness side.— ABS module C135-16, circuit 1205 (BK), harness side.

YesREPAIR the affected circuit(s). CLEAR theDTCs. REPEAT the self-test.NoINSTALL a new HCU. REFER to HydraulicControl Unit (HCU) in this section. CLEAR

• Are the resistances greater than 10,000 ohms? the DTCs. REPEAT the self-test.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST B: DTCs C1095 AND C1096 — ABS HYDRAULIC PUMP MOTOR CIRCUIT

FAILURE/OPEN (Continued)

Test Step Result / Action to TakeB5 CHECK FOR CORRECT ABS MODULE OPERATION




the DTCs. REPEAT the self-test.

Pinpoint Test C: DTCs C1145, C1155, C1165 Voltage and ground signals are supplied to theand C1175 — Wheel Speed Sensor Input wheel speed sensors from the ABS module.Circuit Failure

Possible CausesRefer to Wiring Diagrams Cell 42, Vehicle

• Circuit openDynamic Systems for schematic and connectorinformation. • Circuit shorted

• Wheel speed sensorNormal OperationThe active wheel speed sensors generate a square • Anti-lock brake system (ABS) modulewave signal that is sent to the anti-lock brakesystem (ABS) module. The wheel speed sensorcircuitry connects to the ABS module through 2wires and a connector at each wheel speed sensor.When the ignition is turned to the run position, theABS module carries out a self-test by sending areference voltage to all of the wheel speed sensorsand their circuitry to determine if they arefunctional.

PINPOINT TEST C: DTCs C1145, C1155, C1165 AND C1175 — WHEEL SPEED SENSOR INPUT CIRCUITFAILURE


Test Step Result / Action to TakeC1 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT

TO VOLTAGENOTE: Both circuits must be checked for each DTC.• Key in OFF position.• Disconnect: ABS Module C135.• Disconnect: Suspect Wheel Speed Sensor.• Key in ON position.• For DTC C1145, measure the voltage between:

— ABS module C135-26, circuit 514 (YE/RD), harness sideand ground.

— ABS module C135-27, circuit 516 (YE/BK), harness sideand ground.

• For DTC C1155, measure the voltage between:— ABS module C135-13, circuit 522 (TN/BK), harness side

and ground.— ABS module C135-12, circuit 521 (TN/OG), harness side

and ground.• For DTC C1165, measure the voltage between:

— ABS module C135-44, circuit 524 (PK/BK), harness sideand ground.

— ABS module C135-43, circuit 523 (RD/PK), harness sideand ground.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST C: DTCs C1145, C1155, C1165 AND C1175 — WHEEL SPEED SENSOR INPUT CIRCUIT

FAILURE (Continued)

Test Step Result / Action to TakeC1 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT

TO VOLTAGE (Continued)

• For DTC C1175, measure the voltage between: Yes— ABS module C135-42, circuit 518 (LG/RD), harness side REPAIR the affected circuit(s). CLEAR theand ground. DTCs. REPEAT the self-test.— ABS module C135-41, circuit 519 (LG/BK), harness sideand ground. No

• Is voltage present? GO to C2.C2 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR A SHORT

TO GROUNDNOTE: Both circuits must be checked for each DTC.• Key in OFF position.• For DTC C1145, measure the resistance between:

— ABS module C135-26, circuit 514 (YE/RD), harness sideand ground.

— ABS module C135-27, circuit 516 (YE/BK), harness sideand ground.

• For DTC C1155, measure the resistance between:— ABS module C135-13, circuit 522 (TN/BK), harness side

and ground.— ABS module C135-12, circuit 521 (TN/OG), harness side

and ground.• For DTC C1165, measure the resistance between:

— ABS module C135-44, circuit 524 (PK/BK), harness sideand ground.

— ABS module C135-43, circuit 523 (RD/PK), harness sideand ground.

• For DTC C1175, measure the resistance between: Yes— ABS module C135-42, circuit 518 (LG/RD), harness side GO to C3.and ground.— ABS module C135-41, circuit 519 (LG/BK), harness side No

and ground. REPAIR the affected circuit(s). CLEAR the• Are the resistances greater than 10,000 ohms? DTCs. REPEAT the self-test.

C3 CHECK THE WHEEL SPEED SENSOR CIRCUITS FOR AN OPENNOTE: Both circuits must be checked for each DTC.• For DTC C1145, measure the resistance between:

— ABS module C135-26, circuit 514 (YE/RD), harness sideand RH front wheel speed sensor C160-1, circuit 514(YE/RD), harness side.

— ABS module C135-27, circuit 516 (YE/BK), harness sideand RH front wheel speed sensor C160-2, circuit 516(YE/BK), harness side.

• For DTC C1155, measure the resistance between:— ABS module C135-13, circuit 522 (TN/BK), harness side

and LH front wheel speed sensor C150-2, circuit 522(TN/BK), harness side.

— ABS module C135-12, circuit 521 (TN/OG), harness sideand LH front wheel speed sensor C150-1, circuit 521(TN/OG), harness side.

• For DTC C1165, measure the resistance between:— ABS module C135-44, circuit 524 (PK/BK), harness side

and RH rear wheel speed sensor C3117-2, circuit 524(PK/BK), harness side.

— ABS module C135-43, circuit 523 (RD/PK), harness sideand RH rear wheel speed sensor C3117-1, circuit 523(RD/PK), harness side.

• For DTC C1175, measure the resistance between:— ABS module C135-42, circuit 518 (LG/RD), harness side

and LH rear wheel speed sensor C3116-1, circuit 518 Yes(LG/RD), harness side. GO to C4.— ABS module C135-41, circuit 519 (LG/BK), harness sideand LH rear wheel speed sensor C3116-2, circuit 519 No(LG/BK), harness side. REPAIR the affected circuit(s). CLEAR the

• Are the resistances less than 5 ohms? DTCs. REPEAT the self-test.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST C: DTCs C1145, C1155, C1165 AND C1175 — WHEEL SPEED SENSOR INPUT CIRCUIT

FAILURE (Continued)

Test Step Result / Action to TakeC4 CHECK FOR SHORTED WHEEL SPEED SENSOR CIRCUITS

• Measure the resistance between the suspect wheel speedsensor pins, harness side with the meter in the 10 mega ohmrange.

YesREPAIR the affected circuit(s). CLEAR theDTCs. REPEAT the self-test.No

• Is there any continuity? GO to C5.C5 CHECK THE ABS MODULE OUTPUT

• Connect: ABS Module C135.• Key in ON position.• Measure the voltage between the suspect wheel speed sensor

pins, harness side.

YesINSTALL a new wheel speed sensor.REFER to Wheel Speed Sensor — Frontor Wheel Speed Sensor — Rear in thissection. CLEAR the DTCs. REPEAT theself-test.No

• Is the voltage greater than 10 volts? GO to C6.C6 CHECK FOR CORRECT ABS MODULE OPERATION





Pinpoint Test D: DTCs C1222, C1233, C1234, Normal OperationC1235 and C1236 — Wheel Speed Sensor The wheel speed sensor and sensor ring generate aInput Signal Missing/Mismatch square wave signal to the anti-lock brake system

(ABS) module that is proportional to wheel speed.Refer to Wiring Diagrams Cell 42, VehicleThe ABS module compares wheel speed inputsDynamic Systems for schematic and connectorfrom all wheel speed sensors to determine aninformation.impending wheel lockup. Incorrect tire size can setthese DTCs as well.




Possible Causes

• Wheel speed sensor

• ABS module

PINPOINT TEST D: DTCs C1222, C1233, C1234, C1235 AND C1236 — WHEEL SPEED SENSOR INPUTSIGNAL MISSING/MISMATCH


Test Step Result / Action to TakeD1 CHECK THE DTCs FROM THE SELF-TEST

• Retrieve the recorded results from the anti-lock brake system Yes(ABS) module continuous and on-demand self tests. GO to Pinpoint Test C.

• Are DTCs C1145, C1155, C1165 or C1175 present? NoIf DTC C1222 is present, GO to D3. Allothers, GO to D2.

D2 CHECK THE WHEEL SPEED SENSOR OUTPUTNOTE: The ignition switch must be in the OFF position until theconnections are made or a DTC will set and the ABS warningindicator will illuminate, cutting voltage to the wheel speed sensors.If this happens, turn the ignition switch to the OFF position andmake sure that no jumper connections are shorted to ground orshorted together. Turn the ignition switch to the ON position andwait for the ABS warning indicator to prove out.• Disconnect: Suspect Wheel Speed Sensor.• Connect a fused (5A) jumper wire between the suspect wheel

speed sensor, component side, and the wheel speed sensor,harness side, as follows:— For DTC C1233: LH front wheel speed sensor C150-1,

circuit 521 (TN/OG), harness side and LH front wheel speedsensor C150 pin 1, circuit 521 (TN/OG), component side.

— For DTC C1234: RH front wheel speed sensor C160-1,circuit 514 (YE/RD), harness side and RH front wheel speedsensor C160 pin 1, circuit 514 (YE/RD), component side.

— For DTC C1235: RH rear wheel speed sensor C3117-1,circuit 523 (RD/PK), harness side and RH rear wheel speedsensor C3117 pin 1, circuit 523 (RD/PK), component side.

— For DTC C1236: LH rear wheel speed sensor C3116-1,circuit 518 (LG/RD), harness side and LH rear wheel speedsensor C3116 pin 1, circuit 518 (LG/RD), component side.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST D: DTCs C1222, C1233, C1234, C1235 AND C1236 — WHEEL SPEED SENSOR INPUT

SIGNAL MISSING/MISMATCH (Continued)

Test Step Result / Action to TakeD2 CHECK THE WHEEL SPEED SENSOR OUTPUT (Continued)

• Connect a digital multi-meter between the suspect wheel speedsensor, component side, and the wheel speed sensor, harnessside, as follows:— For DTC C1233: LH front wheel speed sensor C150-2,

circuit 522 (TN/BK), harness side and LH front wheel speedsensor C150 pin 2, circuit 522 (TN/BK), component side.

— For DTC C1234: RH front wheel speed sensor C160-2,circuit 516 (YE/BK), harness side and RH front wheel speedsensor C160 pin 2, circuit 516 (YE/BK), component side.

— For DTC C1235: RH rear wheel speed sensor C3117-2,circuit 524 (PK/BK), harness side and RH rear wheel speedsensor C3117 pin 2, circuit 524 (PK/BK), component side.

— For DTC C1236: LH rear wheel speed sensor C3116-2,circuit 519 (LG/BK), harness side and LH rear wheel speed

Yessensor C3116 pin 2, circuit 519 (LG/BK), component side.GO to D4.• Key in ACCESSORY position.

• NOTE: The wheel must be moved very slowly to allow the meter Noto read the high and low current as the sensor tone ring INSTALL a new wheel speed sensor.openings pass the sensor. REFER to Wheel Speed Sensor — FrontMeasure the current while rotating the wheel slightly. or Wheel Speed Sensor — Rear in this

• Does the digital multi-meter switch between the low state section. CLEAR the DTC(s). REPEAT the(5-8 mA) and the high state (11-18 mA)? self-test.

D3 CHECK FOR CORRECT ABS MODULE CONFIGURATIONOPERATIONNOTE: DTC C1222 indicates there is a problem with the Yesconfiguration in the ABS module. GO to D4.• Carry out the ABS module configuration. Verify the vehicle data No

matches the vehicle options. Refer to Section 418-01. The system is operating correctly at this• Clear the DTCs and carry out the self-test. time. CLEAR the DTCs. REPEAT the• Is DTC C1222 still present? self-test.

D4 CHECK FOR CORRECT ABS MODULE OPERATION• Disconnect: ABS Module C135. Yes• Check for: INSTALL a new ABS module. REFER to




Possible CausesPinpoint Test E: DTC C1446 — Brake SwitchCircuit Failure • Circuit shortedRefer to Wiring Diagrams Cell 42, Vehicle • Brake pedal switchDynamic Systems for schematic and connector

• Brake fluid level sensor (master cylinder)information.• Anti-lock brake system (ABS) moduleNormal Operation

The anti-lock brake system (ABS) module receivesa voltage signal from the smart junction box (SJB)along circuit 535 (LB/RD) through the brake pedalswitch. When the brake pedal is applied the voltagesignal is no longer referenced by the ABS module.The SJB provides 5 volts to the brake fluid levelswitch along circuit 547 (LG/YE). When the brakefluid reaches a certain level, the switch closes andthe 5 volts are sent back to the SJB along circuit512 (TN/LG).



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST E: DTC C1446 — BRAKE SWITCH CIRCUIT FAILURE


Test Step Result / Action to TakeE1 MONITOR THE SMART JUNCTION BOX (SJB) STOPLAMP

SWITCH PID• Connect the scan tool. Yes• Key in ON position. GO to E2.• Press and release the brake pedal while monitoring the SJB Nostoplamp switch PID. For further diagnosis of the stoplamps,• Do the stoplamps illuminate and does the PID agree? REFER to Section 417-01.

E2 MONITOR THE ANTI-LOCK BRAKE SYSTEM (ABS) MODULESTOPLAMP SWITCH PID• Press and release the brake pedal while monitoring the ABS Yes

module stoplamp switch PID and observing the stoplamps. GO to E3.• Does the PID agree with the brake pedal position? No

REPAIR circuit 535 (LB/RD). CLEAR theDTCs. REPEAT the self-test.

E3 CHECK THE BRAKE FLUID LEVEL SWITCH FOR A SHORT• Key in OFF position. Yes• Disconnect: Brake Fluid Level Switch C124. GO to E4.• Key in ON position.

No• Clear the DTCs.INSTALL a new brake fluid reservoir.• Perform the smart junction box (SJB) self test. Retrieve andREFER to section Section 206-06.record any DTCs.

• Did DTC C1446 return? CLEAR the DTCs. REPEAT the self-test.E4 CHECK CIRCUIT 512 (TN/LG) FOR A SHORT TO VOLTAGE

• Key in OFF position. Yes• Disconnect: Smart Junction Box (SJB) C2280c. REPAIR circuit 512 (TN/LG). CLEAR the• Key in ON position. DTCs. REPEAT the self-test.• Measure the voltage between brake fluid level switch C124-2,circuit 512 (TN/LG), harness side and ground. No

• Is any voltage present? GO to E5.E5 CHECK THE ABS MODULE CONNECTOR

• Key in OFF position. Yes• Disconnect: ABS Module C135. INSTALL a new ABS module. REFER to• Check the ABS module connector for: Anti-Lock Brake System (ABS) Module in

— corrosion. this section. CLEAR the DTCs. REPEAT— pushed-out pins. the self-test.— spread terminals. No• Connect: ABS Module C135. The system is operating correctly at this• Make sure the ABS module connector seats correctly, then time. The concern may have been causedoperate the system and verify if the concern is still present. by a loose or corroded connector. CLEAR• Is the concern still present? the DTCs. REPEAT the self-test with the

brake pedal not applied.

Possible CausesPinpoint Test F: Spongy/Soft/Low BrakePedal with No Warning Indicator • Base brake systemNormal Operation • Hydraulic control unit (HCU)The brake pedal should be firm when applied.

PINPOINT TEST F: SPONGY/SOFT/LOW BRAKE PEDAL WITH NO WARNING INDICATOR

Test Step Result / Action to TakeF1 CHECK THE BASE BRAKE COMPONENTS

• Visually inspect the brake hoses and tubes from the hydraulic Yescontrol unit (HCU) to the brake calipers. REPAIR or INSTALL new components as

• Visually inspect the calipers and brake components. necessary. TEST the system for normal• Are any of these components damaged? operation.

NoGO to F2.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST F: SPONGY/SOFT/LOW BRAKE PEDAL WITH NO WARNING INDICATOR (Continued)

Test Step Result / Action to TakeF2 CHECK FOR A LEAKING DUMP VALVE

• Key in OFF position.• Remove the rubber boots from the 2 HCU low pressure

accumulators (LPA) and insert a clean steel implement (e.g.paper clip or a small screwdriver) into each LPA.

• Key in ON position.Yes• NOTE: A leaking dump valve is similar to the master cylinderINSTALL a new HCU. REFER to Hydraulicbypass condition. It is important that the pedal be quickly andControl Unit (HCU) in this section.forcefully applied to rule out master cylinder bypass as a

condition. NoHave an assistant press hard on the brake pedal while REMOVE the steel implements. INSTALLobserving the steel implements. the rubber boots on each LPA. REFER to

• Do either of the implements move out 6.35 mm (0.25 in) or Section 206-00 to continue diagnosis ofmore? the base brake system.

Pinpoint Test G: Poor Vehicle Tracking Fused ignition voltage is supplied by the smartDuring Anti-lock Function junction box (SJB) through circuit 1844 (LG/RD)

and fused battery voltage is supplied by the bussedNormal Operationelectrical center (BEC) through circuit 601 (LB/PK)The operating voltage required to supply theand circuit 534 (YE/LG). Ground is providedanti-lock brake system (ABS) module, hydraulicthrough circuit 1205 (BK).pump and isolation valves is in a range between 10

and 16 volts. Possible Causes

• Base brake system

• Hydraulic control unit (HCU)

PINPOINT TEST G: POOR VEHICLE TRACKING DURING ANTI-LOCK FUNCTION

Test Step Result / Action to TakeG1 BLEED THE BRAKE SYSTEM

• Bleed the brake system using the scan tool. Refer to Section Yes206-00. The brake system is operating correctly.

• Test drive the vehicle. The concern may have been caused by• Does the vehicle track correctly? air in the hydraulic system or a sticky

valve.NoGO to G2.

G2 CHECK THE ABS INLET VALVE (CLOSED POSITION)• Key in ON position. Yes• Rotate all the wheels to make sure they rotate freely (the TRIGGER the LF INLET OFF active

transmission must be in NEUTRAL). command. GO to G3.• Trigger the ABS module LF INLET ON active command. No• Apply moderate brake pedal effort. INSTALL a new HCU. REFER to Hydraulic• Have an assistant attempt to rotate the LF wheel. Control Unit (HCU) in this section. TEST• Does the LF wheel rotate? the system for normal operation.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST G: POOR VEHICLE TRACKING DURING ANTI-LOCK FUNCTION (Continued)

Test Step Result / Action to TakeG3 CHECK THE ABS INLET VALVE (OPEN POSITION)

• Apply moderate brake pedal effort. Yes• Have an assistant attempt to rotate the LF wheel. INSTALL a new HCU. REFER to Hydraulic• Does the LF wheel rotate? Control Unit (HCU) in this section. TEST

the system for normal operation.NoGO to G4.

G4 CHECK THE ABS OUTPUT VALVE (OPEN POSITION)• Apply moderate brake pedal effort.• Trigger ABS module LF INLET ON active command.• Trigger ABS module ABS POWER ON active command (turns Yeson the pump motor) for 6 seconds. (The trigger must be pressed TRIGGER all active commands OFF. GO3 times. Each press runs the pump for 2 seconds.) to G5.• Trigger the ABS module LF OUTLET ON active command, then

trigger the ABS module LF OUTLET OFF active command. NoRepeat 3 times. INSTALL a new HCU. REFER to Hydraulic

• Have an assistant attempt to rotate the LF wheel. Control Unit (HCU) in this section. TEST• Does the LF wheel rotate? the system for normal operation.

G5 CHECK THE ABS INLET AND OUTLET VALVES (CLOSEDPOSITION)• Apply moderate brake pedal effort. Yes• Have an assistant attempt to rotate the LF wheel. INSTALL a new HCU. REFER to Hydraulic• Does the LF wheel rotate? Control Unit (HCU) in this section. TEST

the system for normal operation.NoREPEAT this procedure (beginning withStep H2) for the RF, LR and RR wheelsusing the appropriate active commands. Ifno failure occurs, the system is operatingnormally.

Possible CausesPinpoint Test H: DTC C1093 — TractionControl Disable Switch Circuit Failure and/or • Circuit openthe Traction Control System Cannot be

• Circuit shortedDisabled• Traction control switchRefer to Wiring Diagrams Cell 60, Instrument

Cluster for schematic and connector information. • Anti-lock brake system (ABS) module

• Instrument clusterNormal OperationEngine torque modulation is achieved by regulatingfuel and spark to the cylinders. The traction controlsystem operates using the anti-lock brake system(ABS) module to interact with the powertraincontrol module (PCM) to reduce engine torque andapply the brakes if the wheels lose traction andbegin to spin during acceleration.

The instrument cluster circuit 1412 (WH/PK)monitors for a ground (change of state). When thetraction control switch is pressed, a momentaryground occurs through circuit 1205 (BK). Theinstrument cluster then sends a voltage to thetraction control switch through circuit 939 (VT)illuminating the traction control switch anddisabling the system.



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST H: DTC C1093 — TRACTION CONTROL DISABLE SWITCH CIRCUIT FAILURE AND/OR

THE TRACTION CONTROL SYSTEM CANNOT BE DISABLED


Test Step Result / Action to TakeH1 MONITOR THE INSTRUMENT CLUSTER PID

• Key in ON position. Yes• Monitor the instrument cluster traction control switch status PID GO to H6.

while pressing the traction control disable switch repeatedly. No• Does the PID agree with the switch position? GO to H2.H2 CHECK THE TRACTION CONTROL SWITCH INPUT

• Key in OFF position.• Disconnect: Instrument Cluster C220.• Measure the resistance between instrument cluster C220-20,

circuit 1412 (WH/PK), harness side and ground while pressingand releasing the traction control switch.

YesGO to H3.NoINSTALL a new traction control switch.REFER to Traction Control Switch in this

• Is the resistance less than 5 ohms with the switch pressed section. CLEAR the DTCs. REPEAT theand greater than 10,000 ohms with the switch released? self-test.

H3 CHECK CIRCUIT 1412 (WH/PK) FOR A SHORT TO GROUND• Key in OFF position.• Disconnect: Traction Control Switch C2039.• Measure the resistance between traction control switch C2039-7,

circuit 1412 (WH/PK), harness side and ground.

YesREPAIR circuit 1412 (WH/PK). CLEAR theDTCs. REPEAT the self-test.No

• Is the resistance less than 5 ohms? GO to H4.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST H: DTC C1093 — TRACTION CONTROL DISABLE SWITCH CIRCUIT FAILURE AND/OR

THE TRACTION CONTROL SYSTEM CANNOT BE DISABLED (Continued)

Test Step Result / Action to TakeH4 CHECK CIRCUIT 1412 (WH/PK) FOR AN OPEN

• Measure the resistance between instrument cluster C220-20,circuit 1412 (WH/PK), harness side and traction control switchC2039-7, circuit 1412 (WH/PK), harness side.

YesREPAIR circuit 1412 (WH/PK). CLEAR theDTCs. REPEAT the self-test.No

• Is the resistance greater than 10,000 ohms? GO to H5.H5 CHECK CIRCUIT 1205 (BK) FOR AN OPEN

• Measure the resistance between traction control switch C2039-1,circuit 1205 (BK), harness side and ground.

YesREPAIR circuit 1205 (BK). CLEAR theDTCs. REPEAT the self-test.NoINSTALL a new traction control switch.REFER toTraction Control Switch in thissection. CLEAR the DTCs. REPEAT the

• Is the resistance greater than 10,000 ohms? self-test.H6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

• Disconnect: Instrument Cluster C220. Yes• Check for: INSTALL a new instrument cluster.

REFER to Section 413-01. CLEAR the— corrosion. DTCs. REPEAT the self-test.— spread terminals.— pushed-out pins. No

• Connect the instrument cluster connector and make sure it seats The system is operating correctly at thiscorrectly. time. The concern may have been caused

• Operate the system and verify the concern is still present. by a loose or corroded connector. CLEAR• Is the concern still present? the DTCs. REPEAT the self-test.

Pinpoint Test I: The Traction Control Switch Normal OperationIndicator is Never/Always On The instrument cluster circuit 1412 (WH/PK)

monitors for a ground (change of state). When theRefer to Wiring Diagrams Cell 42, Vehicletraction control switch is pressed momentary groundDynamic Systems for schematic and connectoroccurs through circuit 1205 (BK). The instrumentinformation.cluster then sends a voltage to the traction controlswitch through circuit 939 (VT) illuminating thetraction control switch and disabling the system.




Possible Causes

• Circuit open

• Circuit shorted

• Traction control switch

• Instrument cluster

PINPOINT TEST I: THE TRACTION CONTROL SWITCH INDICATOR IS NEVER/ALWAYS ON


Test Step Result / Action to TakeI1 VERIFY THE TRACTION CONTROL SYSTEM OPERATION

• Operate the system and verify the traction control system can be Yesenabled and disabled. GO to I2.

• Does the traction control system operate correctly? NoREFER to symptom chart to continuediagnosis.

I2 CHECK CIRCUIT 939 (VT) FOR VOLTAGE• Key in OFF position.• Disconnect: Traction Control Switch C2039.• Key in ON position.• Measure the voltage between traction control switch C2039-4,

circuit 939 (VT), harness side and ground.

YesGO to I3.No

• Is voltage present? GO to I4.I3 CHECK CIRCUIT 939 (VT) FOR A SHORT TO VOLTAGE

• Key in OFF position.• Disconnect: Instrument Cluster C220.• Key in ON position.• Measure the voltage between traction control switch C2039-4,

circuit 939 (VT), harness side and ground.

YesREPAIR circuit 939 (VT). TEST thesystem for normal operation.No

• Is voltage present? GO to I6.

(Continued)



DIAGNOSIS AND TESTING (Continued)PINPOINT TEST I: THE TRACTION CONTROL SWITCH INDICATOR IS NEVER/ALWAYS ON (Continued)

Test Step Result / Action to TakeI4 CHECK CIRCUIT 939 (VT) FOR AN OPEN OR SHORT TO

GROUND• Key in OFF position.• Disconnect: Instrument Cluster C220.• Measure the resistance between instrument cluster C220-21,

circuit 939 (VT), harness side and:— traction control switch C2039-4, circuit 939 (VT), harness

side.— ground.

YesREPAIR circuit 939 (VT). TEST thesystem for normal operation.• Is the resistance greater than 10,000 ohms between the

instrument cluster and the traction control switch, and less Nothan 5 ohms between the instrument cluster and ground? GO to I5.

I5 CHECK THE INSTRUMENT CLUSTER OPERATION• Connect: Traction Control Switch C2039.• Connect a fused (10A) jumper wire between instrument cluster

C220-21, circuit 939 (VT), harness side and instrument clusterC220-3, circuit 1001 (WH/YE), harness side.

YesRemove the jumper wire. GO to I6.NoRemove the jumper wire. INSTALL a newtraction control switch. REFER to TractionControl Switch in this section. CLEAR the

• Does the traction control switch indicator illuminate? DTCs. REPEAT the self-test.I6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION

• Disconnect: Instrument Cluster C220. Yes• Check for: INSTALL a new instrument cluster.

REFER to Section 413-01. CLEAR the— corrosion. DTCs. REPEAT the self-test.— spread terminals.— pushed-out pins. No

• Connect the instrument cluster connector and make sure it seats The system is operating correctly at thiscorrectly. time. The concern may have been caused

• Operate the system and verify the concern is still present. by a loose or corroded connector. CLEAR• Is the concern still present? the DTCs. REPEAT the self-test.


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