Autodata - Diagnostic Trouble Codes Fault locations and probable causes - 2004 edition
CHRYSLER Model: Cherokee 2,5/4,0 Grand Cherokee 4,014,7 Wrangler 2,5/4,0 Engine management/transmission Year: 1999-02 Engine code: System: VIN position 8 = N, P, S JTEC Grand Cherokee General information Refer to the front of this manual for general test conditions, terminology, detailed descriptions of wiring faults and a general trouble shooter for electrical and mechanical faults. Malfunction indicator lamp (MIL) will illuminate or flash if certain faults are recorded. ECM operates in emergency mode if sensors fail, to enable vehicle to be driven to workshop. Accessing and erasing The engine control module (ECM) fault memory can only be accessed and erased using diagnostic equipment connected to the data link connector (DLC). Trouble code identification EOBD type Fault location Refer to EOBD trouble code table Decreased engine performance - high intake air temperature Intake air temperature (IAT) sensor - voltage low Intake air temperature (IAT) sensor - voltage high Probable cause PI194 Heated oxygen sensor (HOZS), heater 1 Wiring, HOZS, ECM control - circuit malfunction - Wiring open circuitlshort to positive, earth wire defective, IAT sensor, ECT sensor, engine cooling system, high engine bay temperature, ECM Wiring, IAT sensor, ECM Wiring, IAT sensor, ECM
Model: Cherokee 2,514.0 Grand Cherokee 4,014,7 Wrangler 2,5/4,0 Engine management/transrnission I $ 5 EOBD type Pi195 Pi196 Fault location Heated oxygen sensor (H02S) 1, bank 1 - slow response Heated oxygen sensor (H02S) 1, bank 2 - slow response Probable cause Pi197 Heated oxygen sensor (H02S) 2, I Wiring, heating inoperative, exhaust leak, H02S bank 1 - slow response Pi280 I Fuel pump relay - circuit malfunction / Wiring, fuel pump relay Pi281 Wiring, heating inoperative, exhaust leak, H02S Wiring, heating inoperative, exhaust leak, H02S Pi282 1 Fuel pump relay I Wiring open circuitlshort circuit, fuel pump relay P 1294 Pi295 Pi296 Pi297 Pi298 Engine temperature low for long period Idle speed control (ISC) system - rpm tower1 higher than expected Throttle position (TP) sensor - no 5 volt supply Manifold absolute pressure (MAP) sensor - Wiring, MAP sensor, ECM no 5 volt supply Manifold absolute pressure (MAP) sensor System too lean at prolonged wide open throttle Wiring, engine cooling system, coolant thermostat, ECT sensor Wiring, air leak, throttle valve tightlsticking, IAC valve Wiring, TP sensor, ECM Pi 299 Manifold absolute pressure (MAP) sensor1 Intake leak, hose connection(s), MAP sensor, TP sensor throttle position (TP) sensor Pi388 Pi 389 Pi390 Engine control relay Wiring, hose connection(s), MAP sensor lntakelexhaust leak, MAP sensor, fuel pressurelpump, injector (s), H02S Wiring open circuitlshort circuit, engine control relay Engine control relay 1 Wiring open circuit, engine control relay Pi391 Crankshaft position (CKP) sensorlcamshaft Wiring, poor connection, air gap, CKP sensor, CMP sensor position (CMP) sensor - intermittent signal Pi 398 Engine control module (ECM) - misfire Wiring, poor connection, CKP sensor detection limit reached Pi475 P 1478 Pi486 Pi488 Pi491 Pi492 Pi493 Pi494 Pi495 Crankshaft position (CKP) sensorlcamshaft position (CMP) sensor - signal synchronisation Engine control module (ECM) - auxiliary 5 volt output high I ECM Timing belt looseljumped position, CKP sensor, CMP sensor Battery ambient temperature sensor - range1 Wiring, battery ambient temperature sensor performance problem Evaporative emission (EVAP) system - blockage detected Engine control module (ECM) - auxiliary 5 volt output low Engine coolant blower motor relay - circuit malfunction Battery ambient temperature sensor - voltage high Battery ambient temperature sensor - voltage low Evaporative emission (EVAP) leak detection pump - pressure switch Evaporative emission (EVAP) leak detection pump solenoid I Hose connection(s), hose blockedltrapped, EVAP canister Wiring, ECM Wiring open circuitlshort circuit, engine coolant blower motor Wiring, battery ambient temperature sensor Wiring, battery ambient temperature sensor Wiring, hose leaklblockage, EVAP leak detection pump Wiring open circuitlshort circuit, hose leaklblockage, EVAP leak detection pump solenoid
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Model: Cherokee 2,514.0 Gr<strong>and</strong> Cherokee 4,014,7 Wrangler 2,5/4,0<br />
Engine management/transrnission I $ 5<br />
EOBD<br />
type<br />
Pi195<br />
Pi196<br />
<strong>Fault</strong> location<br />
Heated oxygen sensor (H02S) 1,<br />
bank 1 - slow response<br />
Heated oxygen sensor (H02S) 1,<br />
bank 2 - slow response<br />
Probable cause<br />
Pi197 Heated oxygen sensor (H02S) 2, I Wiring, heating inoperative, exhaust leak, H02S<br />
bank 1 - slow response<br />
Pi280 I Fuel pump relay - circuit malfunction / Wiring, fuel pump relay<br />
Pi281<br />
Wiring, heating inoperative, exhaust leak, H02S<br />
Wiring, heating inoperative, exhaust leak, H02S<br />
Pi282 1 Fuel pump relay I Wiring open circuitlshort circuit, fuel pump relay<br />
P 1294<br />
Pi295<br />
Pi296<br />
Pi297<br />
Pi298<br />
Engine temperature low for long period<br />
Idle speed control (ISC) system - rpm tower1<br />
higher than expected<br />
Throttle position (TP) sensor - no 5 volt<br />
supply<br />
Manifold absolute pressure (MAP) sensor - Wiring, MAP sensor, ECM<br />
no 5 volt supply<br />
Manifold absolute pressure (MAP) sensor<br />
System too lean at prolonged wide open<br />
throttle<br />
Wiring, engine cooling system, coolant thermostat, ECT<br />
sensor<br />
Wiring, air leak, throttle valve tightlsticking, IAC valve<br />
Wiring, TP sensor, ECM<br />
Pi 299 Manifold absolute pressure (MAP) sensor1 Intake leak, hose connection(s), MAP sensor, TP sensor<br />
throttle position (TP) sensor<br />
Pi388<br />
Pi 389<br />
Pi390<br />
Engine control relay<br />
Wiring, hose connection(s), MAP sensor<br />
lntakelexhaust leak, MAP sensor, fuel pressurelpump, injector<br />
(s), H02S<br />
Wiring open circuitlshort circuit, engine control relay<br />
Engine control relay 1 Wiring open circuit, engine control relay<br />
Pi391 Crankshaft position (CKP) sensorlcamshaft Wiring, poor connection, air gap, CKP sensor, CMP sensor<br />
position (CMP) sensor - intermittent signal<br />
Pi 398 Engine control module (ECM) - misfire Wiring, poor connection, CKP sensor<br />
detection limit reached<br />
Pi475<br />
P 1478<br />
Pi486<br />
Pi488<br />
Pi491<br />
Pi492<br />
Pi493<br />
Pi494<br />
Pi495<br />
Crankshaft position (CKP) sensorlcamshaft<br />
position (CMP) sensor - signal<br />
synchronisation<br />
Engine control module (ECM) - auxiliary<br />
5 volt output high I ECM<br />
Timing belt looseljumped position, CKP sensor, CMP sensor<br />
Battery ambient temperature sensor - range1 Wiring, battery ambient temperature sensor<br />
performance problem<br />
Evaporative emission (EVAP)<br />
system - blockage detected<br />
Engine control module (ECM) - auxiliary<br />
5 volt output low<br />
Engine coolant blower motor relay - circuit<br />
malfunction<br />
Battery ambient temperature<br />
sensor - voltage high<br />
Battery ambient temperature<br />
sensor - voltage low<br />
Evaporative emission (EVAP) leak detection<br />
pump - pressure switch<br />
Evaporative emission (EVAP) leak detection<br />
pump solenoid<br />
I Hose connection(s), hose blockedltrapped, EVAP canister<br />
Wiring, ECM<br />
Wiring open circuitlshort circuit, engine coolant blower motor<br />
Wiring, battery ambient temperature sensor<br />
Wiring, battery ambient temperature sensor<br />
Wiring, hose leaklblockage, EVAP leak detection pump<br />
Wiring open circuitlshort circuit, hose leaklblockage, EVAP<br />
leak detection pump solenoid
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