Jeep Liberty KJ. Manual — part 788
P1001-IGNITION KEY OFF TIMER PERFORMANCE - TOO FAST
For a complete wiring diagram Refer to Section 8W
Possible Causes
BODY CONTROL MODULE
BODY CONTROL MODULE POWER AND GROUNDS
CHECKING FOR OTHER DTCS
CHECKING THE ECT OPERATION
IGNITION SWITCH
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several ignition on key cycles turning the ignition off for 10 seconds between cycles.
Turn the ignition on.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
CHECKING FOR OTHER DTCS
Turn the ignition on.
Does the scan tool display all FCM and BCM DTC’s.
NOTE: Any ECM communication related DTC’s in the FCM or BCM must be diagnosed and corrected before
continuing to diagnose this DTC.
Are there any ECM communication related DTC’s in the FCM or BCM?
Yes
>> Refer to the Symptom List and repair communication DTC’s before continuing.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1210
ENGINE DIESEL DIAG
KJ
3.
CHECKING THE ECT OPERATION
Refer to symptom Checking the ECT Sensor and verify proper ECT Sensor operation.
Is the ECT Sensor operating correctly?
Yes
>> Go To 4
No
>> Repair or replace as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.
IGNITION SWITCH
Refer to the Wiring Information and verify proper ignition switch opera-
tion. Turn the ignition key to each position and verifying correct voltage
output by back probing the corresponding ignition switch harness con-
nector cavity.
Is the Ignition Switch functioning properly?
Yes
>> Go To 5
No
>> Repair or replace Ignition Switch, wiring or connectors as
necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
VERIFY THAT THE BCM IS ACTIVE ON THE BUS
With the scan tool, select ECU View.
Verify that the BCM is active on the bus.
Is the BCM active on the bus?
Yes
>> The condition that caused the code to set is not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the
wiring harness connectors for broken, bent, pushed out, and corroded terminals.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response related diagnostic procedures.
KJ
ENGINE DIESEL DIAG
9 - 1211
P1002-IGNITION KEY OFF TIMER PERFORMANCE - TOO SLOW
For a complete wiring diagram Refer to Section 8W
Possible Causes
BODY CONTROL MODULE
BODY CONTROL MODULE POWER AND GROUNDS
CHECKING FOR OTHER DTCS
CHECKING THE ECT OPERATION
IGNITION SWITCH
INTERMITTENT CONDITION
Diagnostic Test
1.
CHECK FOR ACTIVE DTC
NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions
under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the
DTC is displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may
assist when checking for an active DTC.
Turn the ignition on.
With the scan tool, erase ECM DTCs.
Perform several ignition on key cycles turning the ignition off for 10 seconds between cycles.
Turn the ignition on.
Monitor the scan tool for ECM DTCs.
Did this DTC set again?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
CHECKING FOR OTHER DTCS
Turn the ignition on.
Does the scan tool display all FCM and BCM DTC’s.
NOTE: Any ECM communication related DTC’s in the FCM or BCM must be diagnosed and corrected before
continuing to diagnose this DTC.
Are there any ECM communication related DTC’s in the FCM or BCM?
Yes
>> Refer to the Symptom List and repair communication DTC’s before continuing.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
>> Go To 3
9 - 1212
ENGINE DIESEL DIAG
KJ
3.
CHECKING THE ECT OPERATION
Refer to symptom Checking the ECT Sensor and verify proper ECT Sensor operation.
Is the ECT Sensor operating correctly?
Yes
>> Go To 4
No
>> Repair or replace as necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.
IGNITION SWITCH
Refer to the Wiring Information and verify proper ignition switch opera-
tion. Turn the ignition key to each position and verifying correct voltage
output at each ignition switch harness connector cavity.
Is the Ignition Switch functioning properly?
Yes
>> Go To 5
No
>> Repair or replace Ignition Switch, wiring or connectors as
necessary.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
5.
VERIFY THAT THE BCM IS ACTIVE ON THE BUS
With the scan tool, select ECU View.
Verify that the BCM is active on the bus.
Is the BCM active on the bus?
Yes
>> The condition that caused the code to set is not present at this time. Using the wiring diagram/sche-
matic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the
wiring harness connectors for broken, bent, pushed out, and corroded terminals.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No
Response related diagnostic procedures.
KJ
ENGINE DIESEL DIAG
9 - 1213
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