Jeep >> Cherokee 2.5/4.0L – Grand Cherokee 4.0/5.2L – Wrangler 2.5/4.0L (1996 – 1997)

Model Year Engine identification System
Cherokee 2.5L 1996·97 VIN  position 8 =  P   JTEC
Cherokee 4.0L 1996·97 VIN  position 8 =  S   JTEC
Grand Cherokee 4.0L 1996·97 VIN  position 8 =  S   JTEC
Grand Cherokee 5.2L 1996·97 VIN  position 8 =  Y   JTEC
Wrangler 2.5L 1996·97 VIN  position 8 =  P   JTEC
Wrangler 4.0L 1996·97 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.
  • Trouble codes can be displayed by the MIL, digital odometer or by using a Scan Tool connected to the data link connector (DLC).

Accessing

Flash codes

  • Within 5 seconds switch the ignition key ON-OFF-ON-OFF-ON.
  • Count MIL flashes. Note trouble codes.
  • Each trouble code consists of two groups [1] A.
  • The first group of flashes indicate the ‘tens’ of the trouble code.
  • The second group of flashes indicate the ‘units’ of the trouble code.
  • A short pause separates ‘tens’ and ‘units’ [1] [B].
  • A long pause separates each trouble code [1] [C].
  • For example: Trouble code 21 displayed [1]
  • End of test sequence indicated by trouble code 55.
  • Trouble codes can also be displayed by the digital odometer using the same key cycling procedure as above. After code 55 is displayed the odometer will return to its normal mode.

P codes & Hex codes

• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC):
  1. Cherokee/Wrangler [2]
  2. Grand Cherokee [3]

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 OBD-II trouble code tables
P1294 Idle speed control (ISC) system -rpm lower/ higherthan expected Wiring, air leak, throttle valve tight/sticking, lAC valve
P1296 Manifold absolute pressure (MAP) sensor supply voltage Wiring, MAP sensor, ECM
P1297 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
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, engine mechanical fault, ignition/fuel system, CKP sensor, ECM
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, ECM
P1493 Ambient/battery temperature sensor -voltage low Wiring, ambient/battery temperature sensor, ECM
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
P1698 Engine control module (ECM) -EEPROM error ECM
P1756 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
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
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 Govemor 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
P1899 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECM
 
Flash code Scan code Hex type Fault location Probable cause
11 Crankshaft position (CKP) sensor/camshaft position (CMP) sensor Wiring, poor connection, air gap, CKP sensor,CMP sensor
28 Crankshaft position (CKP) sensor no signal Wiring, air gap, CKP sensor
90 Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal Wiring, poor connection, air gap, CKP sensor,CMP sensor
BA Engine control module (ECM) -misfire detection limit reached Wiring, poor connection, engine mechanical fault, ignition/fuel system, CKP sensor, ECM
12 Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFF cycles Wiring, battery
13 27 Manifold absolute pressure (MAP) sensor Wiring, hose connection(s), MAP sensor
14 Manifold absolute pressure (MAP) sensor input low/high Wiring, MAP sensor
24 Manifold absolute pressure (MAP) sensor low input Wiring short circuit to ground, MAP sensor
25 Manifold absolute pressure (MAP) sensor high input Wiring short circuit to positive, MAP sensor
87 Manifold absolute pressure (MAP) sensor supply voltage Wiring, MAP sensor, ECM
15 Vehicle speed sensor (VSS) -signal Wiring, VSS, ECM
23 Vehicle speed sensor (VSS) -no signal Wiring, VSS, ECM
A6 Vehicle speed sensor (VSS) -circuit malfunction Wiring, VSS, ECM
17 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECl sensor
21 Engine temperature -low for long period Wiring, cooling system, coolant thermostat, ECl sensor
80 Insufficient coolant temperature for closed loop fuel control Wiring, cooling system, coolant thermostat, ECT sensor
21 Heated oxygen sensor (H02S) 1/2, bank 1 -circuit/signal malfunction Wiring, fuel pressure, injector control, EVAP canister purge valve, compression, air filter blocked, catalytic converter, H02S
3E Heated oxygen sensor (H02S) 1, bank 1 high voltage Wiring short circuit to positive, H02S
66 Heated oxygen sensor (H02S) 1, bank 1 slow response Heating inoperative, wiring, 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
7E Heated oxygen sensor (H02S) 2, bank 1 high voltage Wiring short circuit to positive, catalytic converter, H02S
98 Heated oxygen sensor (H02S) 1, bank 1 low voltage Exhaust leak, wiring short circuit to ground, H02S
9C Heated oxygen sensor (H02S) 2, bank 1 low voltage Exhaust leak, wiring short circuit to ground, H02S
CO Heated oxygen sensor (H02S) 1, bank 1 slow response Heating inoperative, wiring, H02S
22 Engine coolant temperature (ECT) sensor voltage low/high Wiring, coolant thermostat, ECT sensor
1E Engine coolant temperature (ECT) sensor low input Coolant thermostat, wiring short circuit to ground, ECT sensor
1F Engine coolant temperature (ECT) sensor high input Coolant thermostat, wiring open circuit! short circuit to positive, ground wire defective, ECT sensor
23 Intake air temperature (IAT) sensor voltagelow/high Wiring, IAT sensor
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
24 Throttle position (TP) sensor -voltage low/ high Wiring, accelerator cable adjustment, TP sensor
1A Throttle position (TP) sensor -low input Wiring short circuit to ground, TP sensor
1B Throttle position (TP) sensor -high input Wiring short circuit to positive, TP sensor
84 Throttle pOSition (TP) sensor -range/ performance problem Wiring, accelerator cable adjustment, TP sensor
25 Idle air control (lAC) valve Wiring open circuit/short circuit, lAC valve
19 Idle speed control (ISC) system malfunction Wiring open circuit/short circuit, lAC valve
8A Idle speed control (ISC) system -rpmlower/higher than expected Wiring, air leak, throttle valve tight/ sticking, lAC valve
27 Injector(s) -circuit malfunction Wiring, injector
13 Injector 3 -circuit malfunction Wiring, injector
14 Injector 2 -circuit malfunction Wiring, injector
15 Injector 1 -circuit malfunction Wiring, injector
3D Injector 4 -circuit malfunction Wiring, injector
45 Injector 5 -circuit malfunction Wiring, injector
46 Injector 6 -circuit malfunction Wiring, injector
4F Injector 7 -circuit malfunction Wiring, injector
50 Injector 8 -circuit malfunction Wiring, injector
31 Evaporative emission (EVAP) canister purge valve/system Wiring, EVAP canister, EVAP canister purge valve
12 Evaporative emission (EVAP) canister purge valve -circuit malfunction Wiring open circuit/short circuit, EVAP canister purge valve
71 Evaporative emission (EVAP) system incorrectflow detected Hose connection(s), intake leak, EVAP canister purge valve
AO Evaporative emission (EVAP) system -small leak detected 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
BB Evaporative emission (EVAP) system -blockage detected Hose connection(s), hose blocked! trapped, EVAP canister
31 88 Evaporative emission (EVAP) leak detection pump -pressure switch Wiring, hose leak/blockage, EVAP leak detection pump
87 Evaporative emission (EVAP) leak detectionpump solenoid Wiring open circuit/short circuit, hose leak/blockage, EVAP leak detection pump solenoid
33 10 AlC compressor clutch relay Wiring open circuit/short circuit, AlC compressor clutch relay
34 Cruise control Wiring open circuit/short circuit, hoses, voltage low/high, cruise control master switch, cruise control vacuum switching valve
OF Cruise control Wiring open circuit/short circuit, hoses, voltage low/high, 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
35 OE Engine coolant blower motor relay Wiring open circuit/short circuit, engine coolant blower motor relay -low/high speed
37 Transmission control system -malfunction Wiring, transmission fluid level, transmission mechanical fault, PNP switch, TCC solenoid, TFT sensor, TFP solenoid, shift solenoid, governor pressure solenoid, transmission system relay, ECM
OC Torque converter clutch (TCC) solenoid -electrical Wiring open circuit/short circuit, TCC solenoid
32 Shift solenoid (SS) 3-4 electrical Wiring, shift solenoid, ECM
72 Park/neutral position (PNP) switch -input circuit malfunction Wiring, PNP switch, ECM
80 Govemor 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
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
A4 Transmission fluid temperature (TFT) sensor range/performance problem Wiring, TFT sensor
37 AS Gear selection, 3-4 -shift malfunction Wiring, TR sensor, shift solenoids, transmission mechanical fault
AS Transmission fluid pressure (TFP) solenoid -electrical Wiring, TFP solenoid, ECM
AD Transmission system relay Wiring open circuit/short circuit, transmission system relay, ECM
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
41 8 Alternator, field control -circuit malfunction Wiring open circuit/short circuit, alternator, battery
42 Fuel pump relay/engine control relay/fuel level sensor -circuit malfunction Wiring open circuit/short circuit, fuel pump relay, engine control relay, fuel level sensor
OA Engine control relay Wiring open circuit/short circuit, engine control relay
2C Engine control relay Wiring open circuit, engine control relay
65 Fuel pump relay Wiring open circuit/short circuit, fuel pump relay
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
43 Random/multiple cylinder(s) -misfire detected Wiring, spark plug(s), HT lead(s), injector(s),ignition coil(s), low compression
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, ignitionl 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
AE Cylinder 5 -misfire detected Wiring, engine mechanical fault, ignition/ fuel system, injector
AF Cylinder 6 -misfire detected Wiring, engine mechanical fault, ignitionl fuel system, injector
80 Cylinder 7 -misfire detected Wiring, engine mechanical fault, ignitionl fuel system, injector
43 81 Cylinder 8 -misfire detected Wiring, engine mechanical fault, ignition/ fuel system, injector
28 Ignition coil A, primary -circuit malfunction Wiring, ignition coil
44 Ambient/battery temperature sensor voltage low/high Wiring, ambient/battery temperature sensor, ECM
9A Ambient/battery temperature sensor voltage high Wiring, ambient/battery temperature sensor, ECM
99 Ambient/battery temperature sensor voltage low Wiring, ambient/battery temperature sensor,ECM
45 Transmission control system -malfunction Wiring, transmission fluid level, transmission mechanical fault, PNP switch, TCC solenoid, TFT sensor, TFP solenoid, shift solenoid, overdrive solenoid/switch, governor pressure solenoid, transmission system relay, ECM
32 Shift solenoid (SS) 3-4 -electrical Wiring, shift solenoid, ECM
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
8D Govemor 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
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
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
A7 Govemor pressure sensor -signal low Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM
A8 Governor pressure sens.or signal high Signal wire short circuit to poSitive, supply wire open circuit, transmission fluid level,governor pressure sensor, ECM
45 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) solenoid -electrical Wiring, TFP solenoid, ECM
AD Transmission system relay Wiring open circuit/short circuit, transmission system relay, ECM
BC Overdrive solenoid/switch -performance problem Wiring, overdrive solenoid/switch, transmission mechanical fault, ECM
46 6 Alternator -voltage high Wiring, battery, alternator
47 5 Alternator -voltage low Wiring, battery, alternator drive belt, alternator
51 77 System too lean Wiring, intake/exhaust leak, MAP sensor, fuel pressure/pump, EVAP canister purge valve,injector(s), H02S
52 76 System too rich Wiring, intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), air filter blocked, ignition system, H02S
53 Engine control module (ECM) -intemal fault ECM
2 Engine control module (ECM) -intemal fault ECM
44 Engine control module (ECM) -internal fault ECM
54 1 Camshaft pOSition (CMP) sensor -no signal Wiring, CMP sensor
55 End of MIL code output
63 31 Engine control module (ECM) -EEPROM error ECM
72 70 Catalytic converter system, bank 1 efficiency below threshold Catalytic converter, wiring, H02S 2
77 52 Cruise control Wiring, cruise control vacuum switching valve