Jeep >> Cherokee 2.5/4.0L – Grand Cherokee 4.0/5.2/5.9L – Wrangler 2.5/4.0L

Model Year Engine identification System
Cherokee 2.5L 1998 VIN  position 8 =  P   JTEC
Cherokee 4.0L 1998 VIN  position 8 =  S   JTEC
Grand Cherokee 4.0L 1998 VIN  position 8 =  S   JTEC
Grand Cherokee 5.2L 1998 VIN  position 8 =  Y   JTEC
Grand Cherokee 5.9L 1998 VIN  position 8 = Z JTEC
Wrangler 2.5L 1998 VIN  position 8 =  P   JTEC
Wrangler 4.0L 1998 VIN  position 8 =  S   JTEC

General information

  • Malfunction indicator lamp (MIL) will illuminate or flash if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.

Accessing

• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC):
  1. o Cherokee/Wrangler 1
  2. o Grand Cherokee 2

Erasing

• Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC).

Trouble code  identification

Scan code Ptype Fault location Probable cause
PO,P2,UO Refer to OBO-II trouble code tables
P1195 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, heating inoperative, H02S
P1197 Heated oxygen sensor (H02S) 2, bank 1 slowresponse Wiring, heating inoperative, H02S
P1281 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECT sensor
P1282 Fuel pump relay Wiring open circuit/short circuit, fuel pump relay
P1294 Idle speed control (ISC) system -rpm lower/higher than expected Wiring, air leak, throttle valve tight/sticking, lAC valve
P1296 Manifold absolute pressure (MAP) sensor no 5 volt supply Wiring, ECM
P1297 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
P1388 Engine control relay Wiring open circuit/short circuit, engine control relay
P1389 Engine control relay Wiring open circuit, engine control relay
P1391 Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal Wiring, poor connection, air gap, CKP sensor, CMP sensor
P1398 Engine control module (ECM) -misfire detection limit reached Wiring, poor connection, CKP sensor
P1486 Evaporative emission (EVAP) system -blockage detected Hose connection(s), hose blocked/trapped, EVAP canister
P1492 Ambient/battery temperature sensor -voltage high Wiring, ambient/battery temperature sensor
P1493 Ambient/battery temperature sensor -voltage low Wiring, ambient/battery temperature sensor
P1494 Evaporative emission (EVAP) leak detection pump -pressure switch Wiring, hose leak!blockage, EVAP leak detection pump
P1495 Evaporative emission (EVAP) leak detection pump solenoid Wiring open circuit/short circuit, hose leak! blockage, EVAP leak detection pump solenoid
P1594 Alternator -voltage high Wiring, battery, alternator
P1595 Cruise control Wiring open circuit/short circuit, hoses, cruise control master switch, cruise control vacuum switching valve
P1596 Cruise control master switch -high voltage Wiring, cruise control master switch
P1597 Cruise control master switch -low voltage Wiring, cruise control master switch
P1683 Cruise control Wiring, cruise control vacuum switching valve
P1696 Engine control module (ECM) -EEPROM error ECM
P1762 Govemor pressure sensor -incorrect signal Signal wire short circuit to ground/positive, supply wire open circuit/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM
P1763 Governor pressure sensor -signal high Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
P1764 Govemor pressure sensor -signal low Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
P1765 Transmission system relay Wiring open circuit/short circuit, transmission system relay, ECM
P1756 Governor pressure not equal to target (15-20PSI) -mid pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
P1757 Govemor pressure not equal to target -low pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
P1899 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECMITCM
 
Scan code Hex type Fault location Probable cause
0 DTC error
1 Camshaft position (CMP) sensor no signal Wiring, CMP sensor
2 Engine control module (ECM) -intemal fault ECM
5 Altemator -voltage low Wiring, battery, alternator drive belt, alternator
6 Altemator -voltage high Wiring, battery, alternator
OA Engine control relay Wiring open circuit/short circuit, engine control relay
8 Altemator, field control -circuit malfunction Wiring open circuit/short circuit, alternator, battery
OC Torque converter clutch (TeC) solenoid -electrical Wiring open circuit/short circuit, TCC solenoid
0F Cruise control Wiring open circuit/short circuit, hoses, cruise control master switch, cruise control vacuum switching valve
10 AlC compressor clutch relay Wiring open circuit/short circuit, AlC compressor clutch relay
12 Evaporative emission (EVAP) canister purgevalve -circuit malfunction Wiring open circuit/short circuit, EVAP canisterpurge valve
13 Injector 3 -circuit malfunction Wiring, injector
14 Injector 2 -circuit malfunction Wiring, injector
15 Injector 1 -circuit malfunction Wiring, injector
19 Idle speed control (ISC) system -malfunction Wiring open circuit/short circuit, lAC valve
1A Throttle position (TP) sensor -low input Wiring short circuit to ground, TP sensor
18 Throttle position (TP) sensor -high input Wiring short circuit to positive, TP sensor
1E Engine coolant temperature (ECT) sensor low input Wiring short circuit to ground, coolant thermostat, ECT sensor
1F Engine coolant temperature (ECT) sensor high input Wiring open circuit/short circuit to positive, coolantthermostat, ground wire defective, ECTsensor
21 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECTsensor
23 Vehicle speed sensor (VSS) -signal Wiring, VSS
24 Manifold absolute pressure (MAP) sensor lowinput Wiring short circuit to ground, MAP sensor
25 Manifold absolute pressure (MAP) sensor highinput Wiring short circuit to positive, MAP sensor
27 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
28 Crankshaft position (CKP) sensor no !,lignal Wiring, air gap, CKP sensor
28 Ignition coil A, primary/secondary -circuitmalfunction Wiring, ignition coil
2C Engine control relay Wiring open circuit, engine control relay
31 Engine control module (ECM) -EEPROM error ECM
32 Shift solenoid (SS) A -electrical Wiring, shift solenoid, ECMITCM
39 Intake air temperature (IAT)’ sensor low input Wiring short circuit to ground, IAT sensor
3A Intake air temperature (IAT) sensor -high input Wiring open circuit/short circuit to positive, ground wire defective, IAT sensor
3D Injector 4 -circuit malfunction Wiring, injector
3E Heated oxygen sensor (H02S) 1, bank 1 highvoltage Wiring short circuit to positive, fuel pressure,injector control, EVAP canister purge valve, air filter blocked, H02S
44 Engine control module (ECM) -internal fault ECM
45 Injector 5 -circuit malfunction Wiring, injector
46 Injector 6 -circuit malfunction Wiring, injector
4A Transmission fluid temperature (TFT) sensor low input Wiring short circuit to ground, TFT sensor, ECM
48 Transmission fluid temperature (TFT) sensor high input Wiring short circuit to positive, TFT sensor, ECM
4F Injector 7 -circuit malfunction Wiring, injector
50 Injector 8 -circuit malfunction Wiring, injector
52 Cruise control Wiring, cruise control vacuum switching valve
56 Cruise control master switch -high voltage Wiring, cruise control master switch
57 Cruise control master switch -low voltage Wiring, cruise control master switch
65 Fuel pump relay Wiring open circuit/short circuit, fuel pump relay
66 Heated oxygen sensor (H02S) 1, bank 1 slow response Wiring, heating inoperative, H02S
67 Heated oxygen sensor (H02S) 1, bank 1 heater control -circuit malfunction Wiring, H02S
69 Heated oxygen sensor (H02S) 2, bank 1, heater control -circuit malfunction Wiring, H02S
6A Random/multiple cylinder(s) -misfire detected Wiring, spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression
68 Cylinder 1 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
6C Cylinder 2 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
60 Cylinder 3 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
6E Cylinder 4 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
70 Catalytic converter system, bank 1 -efficiency below threshold Wiring, H02S 2, catalytic converter
71 Evaporative emission (EVAP) system incorrect flow detected Hose connection(s), intake leak, EVAP canister purge valve
72 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECMITCM
76 System too rich Wiring, intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), air filter blocked, ignition system, H02S
77 System too lean Wiring, intake/exhaust leak, MAP sensor, fuel pressure/pump, EVAP canister purge valve,injector(s), H02S
7E Heated oxygen sensor (H02S) 2, bank 1 high voltage Wiring short circuit to positive, catalytic converter, H02S
80 Insufficient coolant temperature for closed loop fuel control Wiring, cooling system, coolant thermostat, ECTsensor
84 Throttle position (TP) sensor range/performanceproblem Wiring, accelerator cable adjustment, TP sensor
87 Manifold absolute pressure (MAP) sensor no 5 volt supply Wiring, ECM
8A Idle speed control (ISC) system -rpmlower/higher than expected Wiring, air leak, throttle valve tight/sticking, lAC valve
80 Govemor pressure not equal to target (15-20 PSI) -mid pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
8E Govemor pressure not equal to target -low pressure malfunction Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply
94 Torque converter clutch (TCC) solenoid -circuit malfunction Wiring, TCC solenoid
95 Fuel level sensor -low input Wiring open circuit, fuel level sensor
96 Fuel level sensor -high input Wiring short circuit to positive, fuel level sensor
97 Fuel level sensor -malfunction Wiring, fuel level sensor
99 Ambient/battery temperature sensor -voltage low Wiring, ambient/battery temperature sensor
9A Ambient/battery temperature sensor -voltage high Wiring, ambient/battery temperature sensor
98 Heated oxygen sensor (H02S) 1, bank 1 -low voltage Wiring short circuit to ground, exhaust leak, H02S
9C Heated oxygen sensor (H02S) 2, bank 1 -lowvoltage Wiring short circuit to ground, exhaust leak, H02S
90 Crankshaft position (CKP) st;lnsor/camshaft position (CMP) sensor -intermittent signal Wiring, poor connection, air gap, CKP sensor, CMP sensor
AO Evaporative emission (EVAP) system -small leakdetected Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
A1 Evaporative emission (EVAP) system -large leak detected Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
A4 Transmission fluid temperature (TFT) sensorrange/performance problem Wiring, TFT sensor
A5 Gear selection, 3-4 -shift malfunction Wiring, TR sensor, shift solenoids, transmission mechanical fault
A6 Output shaft speed (OSS) sensor -circuit malfunction Wiring, OSS sensor, ECM
A7 Govemor pressure sensor -signal low Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
A8 Govemor pressure sensor -signal high Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
A9 Govemor pressure sensor -incorrect signal Signal wire short circuit to ground/positive, supply wire open circuit/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM
AB Transmission fluid pressure (TFP) solenoidelectrical Wiring, TFP solenoid, ECM
AD Transmission system relay Wiring open circuit/short circuit, transmissionsystem relay, ECM
AE Cylinder 5 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
AF Cylinder 6 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
BO Cylinder 7 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
B1 Cylinder 8 -misfire detected Wiring, engine mechanical fault, ignition/fuel system, injector
B7 Evaporative emission (EVAP) leak detection pump solenoid Wiring open circuit/short circuit, hose leak/ blockage, EVAP leak detection pump solenoid
B8 Evaporative emission (EVAP) leak detection pump -pressure switch Wiring, hose leak/blockage, EVAP leak detection pump
BA Engine control module (ECM) -misfire detectionlimit reached Wiring, poor connection, CKP sensor
BB Evaporative emission (EVAP) system blockage detected Hose connection(s), hose blocked/trapped, EVAP canister
BC Overdrive solenoid/switch -perforrnance problem Wiring, overdrive solenoid/switch, transmission mechanical fault, ECM
CO Heated oxygen sensor (H02S) 1, bank 1 slowresponse Wiring, heating inoperative, H02S
C2 Heated oxygen sensor (H02S) 2, bank 1 slowresponse Wiring, heating inoperative, exhaust leak, H02S