Jeep Liberty KJ. Manual — part 794
P1131-GLOW PLUG MODULE INTERNAL FAULT
For a complete wiring diagram Refer to Section 8W
9 - 1234
ENGINE DIESEL DIAG
KJ
Possible Causes
BATTERY SUPPLY CIRCUIT OPEN
GROUND CIRCUIT OPEN
INTERMITTENT CONDITION
GLOW PLUG CONTROL MODULE
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.
Turn the ignition off for 10 seconds.
Turn the ignition on.
Monitor the scan tool for ECM DTCs.
Repeat this test several times.
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.
GROUND CIRCUIT OPEN
Turn the ignition off.
Disconnect the Glow Plug Control Module harness connector.
Using a 12-volt test light connected to 12-volts, check the Ground circuit
at the Glow Plug Control Module harness connector.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the Glow Plug Control Module Ground circuit for an
open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
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ENGINE DIESEL DIAG
9 - 1235
3.
BATTERY SUPPLY CIRCUIT OPEN
Turn the ignition off.
Disconnect the Glow Plug Control Module harness connector.
Using a 12-volt test light connected to ground, check the Battery Supply
circuit at the Glow Plug Control Module harness connector.
Does the test light illuminate brightly?
Yes
>> Replace the Glow Plug Control Module.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
No
>> Repair the Glow Plug Control Module Battery Supply circuit
for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
9 - 1236
ENGINE DIESEL DIAG
KJ
P1135-GLOW PLUG MODULE CONTROL CIRCUIT EXCESSIVE CURRENT
For a complete wiring diagram Refer to Section 8W
KJ
ENGINE DIESEL DIAG
9 - 1237
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