emmisioncontrol and obd codes

8/14/2019 Emmisioncontrol and OBD Codes

1/4

EMISSION CONTROL SYSTEMS

CONTENTS

page

ON-BOARD DIAGNOSTICS . . . . . . . . . . . . . . . . . 1

ON-BOARD DIAGNOSTI CS

INDEX

page

DESCRIPTION AND OPERATIONDIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . 1

DESCRIPTION AND OPERATION

DIAGNOSTIC TROUBLE CODES

A D ia g n os t ic Tr ou b le C od e (D TC ) i n di ca t e s t h e

P C M h a s r e cog n iz ed a n a b n or m a l con d it i on i n t h e

system.

D i a g n o s t i c t r o u b l e c o d e s a r e t h e r e s u l t s o f a

s y st e m o r c i rc u it fa i lu r e, b u t d o n o t d i re c tl y

i d e n t i fy t h e f a il e d c o m p o n e n t o r c o m p o n e n t s .

Stored DTCs can be r ead by connecting the DRBscan tool (or an equivalent scan tool) to the 16way

data link connector.

NOTE: For a list of DTCs, refer to the charts in thissection. For complete diagnosis of the DTCs, referto the 1998 TJ Powertrain Diagnostic Manual. Vehi-

cles equipped to run on leaded fuel do not use oxy-gen sensors.

OBTAINING DIAGNOSTIC TROUBLE CODES

WARNING: APPLY PARKING BRAKE AND/ORBLOCK WHEELS BEFORE PERFORMING ANY TESTON AN OPERATING ENGINE.

(1) Connect the DRB scan tool to data l ink (diag-

nostic) conn ector.

(2) Turn the ignition switch on, a ccess Read Fau lt

Screen. Record all th e DTCs shown on the DRB scan

tool.

(3 ) To e r a s e D TC s , u s e t h e Er a s e Tr ou b le C od e

data screen on the DRB scan tool.

T J EMISSION CONTROL SYSTEMS 25 - 1


2/4

DIAGNOSTIC TROUBLE CODE DESCRIPTIONS

* Check E ngine Lam p (MIL) will illuminat e dur ing engine opera tion if th is Diagnostic Trouble Code was r ecorded.

Hex Code

GenericScan

ToolCode

DRB Scan Tool Display Description of Diagnostic Trouble Code

00 DTC Error

01 P0340 No Cam Signal at PCM No camshaft signal detected during enginecranking.

02 P0601 Internal Controller Failure PCM Internal fault condition detected.

05 Charging System VoltageToo Low

Battery voltage sense input below target chargingduring engine operation. Also, no significantchange detected in battery voltage during activetest of generator output circuit.

06 Charging System VoltageToo High

Battery voltage sense input above target chargingvoltage during engine operation.

0A Auto Shutdown RelayControl Circuit

An open or shorted condition detected in the autoshutdown relay circuit.

0B Generator Field NotSwitching Properly

An open or shorted condition detected in thegenerator field control circuit.

0C P0743 Torque Converter ClutchSoleniod CKT

An open or shorted condition detected in thetorque converter part throttle unlock solenoidcontrol circuit (3 speed auto RH trans. only).

0F Speed Control SolenoidCircuits

An open or shorted condition detected in theSpeed Control vacuum or vent solenoid circuits.

10 A/C Clutch Relay Circuit An open or shorted condition detected in the A/Cclutch relay circuit.

12 P0443 EVAP Purge SolenoidCircuit

An open or shorted condition detected in the dutycycle purge solenoid circuit.

*13 P0203 Injector #3 Control Circuit Injector #3 output driver does not respond properlyto the control signal.

or


or


19 P0505 Idle Air Control MotorCircuits

A shorted or open condition detected in one ormore of the idle air control motor circuits.

*1A P0122 Throttle Position SensorVoltage Low

Throttle position sensor input below the minimumacceptable voltage

or

*1B P0123 Throttle Position SensorVoltage High

Throttle position sensor input above the maximumacceptable voltage.

*1E P0117 ECT Sensor Voltage TooLow

Engine coolant temperature sensor input belowminimum acceptable voltage.

or

25 - 2 EMISSION CONTROL SYSTEMS T J

DESCRIPTION AND OPERATION (Continued)


3/4

Hex Code

GenericScanTool

Code

DRB Scan Tool Display Description of Diagnostic Trouble Code

*1F P0118 ECT Sensor Voltage Too

High

Engine coolant temperature sensor input above

maximum acceptable voltage.

21 Engine Is Cold Too Long Engine did not reach operating temperature within

acceptable limits.

23 P0500 No Vehicle SpeedSensor Signal

No vehicle speed sensor signal detected duringroad load conditions.

*24 P0107 MAP Sensor Voltage TooLow

MAP sensor input below minimum acceptablevoltage.

or

*25 P0108 MAP Sensor Voltage TooHigh

MAP sensor input above maximum acceptablevoltage.

*27 P1297 No Change in MAP FromStart to Run

No difference recognized between the engine MAPreading and the barometric (atmospheric) pressure

reading from start-up.

28 No Crank ReferenceSignal at PCM

No crank reference signal detected during enginecranking.

2B P0351 Ignition Coil #1 PrimaryCircuit

Peak primary circuit current not achieved withmaximum dwell time.

2C No ASD Relay OutputVoltage at PCM

An Open condition Detected In The ASD RelayOutput Circuit.

31 P1698 PCM Failure EEPROMWrite Denied

Unsuccessful attempt to write to an EEPROMlocation by the PCM.

*39 P0112 Intake Air Temp Sensor

Voltage Low

Intake air temperature sensor input below the

maximum acceptable voltage.

or

*3A P0113 Intake Air Temp SensorVoltage High

Intake air temperature sensor input above theminimum acceptable voltage.

*3D P0204 Injector #4 Control Circuit Injector #4 output driver does not respond properlyto the control signal.

3E P0132 Left O2 Sensor Shortedto Voltage

Left oxygen sensor input voltage maintained abovethe normal operating range.

44 P0600 PCM Failure SPICommunications

PCM Internal fault condition detected.


or

*46 P0206 Injector #6 Control Circuit Injector #6 output driver does not respond properly

to the control signal.

52 S/C Power Relay Circuit Malfunction detected with power feed to speedcontrol servo solenoids.

57 Speed Control SwitchAlways Low

Speed control switch input below the minimumacceptable voltage.

65 Fuel Pump Relay ControlCircuit

An open or shorted condition detected in the fuelpump relay control circuit.

T J EMISSION CONTROL SYSTEMS 25 - 3

DESCRIPTION AND OPERATION (Continued)


4/4

emmisioncontrol and obd codes

Documents