Jeep XJ. Manual — part 547
Symptom:
*NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE
POSSIBLE CAUSES
REPLACE PDC FUSE
FUSED B+ CIRCUIT SHORTED TO GROUND
SKIM - FUSED B+ CIRCUIT SHORTED TO GROUND
FUSED B+ CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
GROUND CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
SENTRY KEY IMMOBILIZER MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Remove and inspect fuse #27 in the PDC.
Is the fuse open?
All
Yes
→
No
→
2
Turn the ignition off.
Replace fuse #27 in the PDC.
Turn the ignition on.
Turn the ignition off and inspect fuse #27 in the PDC.
Is the fuse open?
All
Yes
→
No
→
Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short to ground.
Perform SKIS VERIFICATION.
3
Turn the ignition off.
Disconnect the SKIM harness connector.
Measure the resistance between ground and the Fused B+ circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Fused B+ circuit for a short to ground.
Perform SKIS VERIFICATION.
No
→
Replace the Sentry Key Immobilizer Module.
Perform SKIS VERIFICATION.
68
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
NOTE: Ensure fuse #27 is installed in the PDC.
Disconnect the SKIM harness connector.
Measure the voltage of the Fused B+ circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused B(+) circuit for an open.
Perform SKIS VERIFICATION.
5
Turn the ignition off.
Disconnect the SKIM harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform SKIS VERIFICATION.
6
Turn the ignition off.
Disconnect the SKIM harness connector.
Turn all lights off.
Measure the resistance between ground and both Ground circuits in the SKIM
connector.
Is the resistance below 5.0 ohms for each measurement?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform SKIS VERIFICATION.
7
Turn the ignition off.
Disconnect the SKIM harness connector.
Connect a jumper wire between the CCD Bus (+) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (+) circuit for an open.
Perform SKIS VERIFICATION.
8
Turn the ignition off.
Disconnect the SKIM harness connector.
Connect a jumper wire between the CCD Bus (-) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (-) circuit for an open.
Perform SKIS VERIFICATION.
9
If there are no possible causes remaining, view repair.
All
Repair
Replace the Sentry Key Immobilizer Module.
Perform SKIS VERIFICATION.
69
COMMUNICATION
*NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE —
Continued
Symptom:
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE
POSSIBLE CAUSES
GROUND CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
TRANSMISSION CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Measure the resistance between ground and the ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
2
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit.
Is the voltage above 10.0 volts?
All
Yes
→
No
→
Repair the Fused Ignition Switch Output circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
3
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Connect a jumper wire between the CCD Bus (+) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (+) circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
70
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
NOTE: Ensure the DRB can establish communications with the PCM before
beginning.
Turn the ignition off.
Disconnect the TCM harness connector.
Connect a jumper wire between the CCD Bus (-) circuit and ground.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: SHORT TO GROUND?
All
Yes
→
No
→
Repair the CCD Bus (-) circuit for an open.
Perform AW4 TRANS VERIFICATION TEST-VER1.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Transmission Control Module.
Perform AW4 TRANS VERIFICATION TEST-VER1.
71
COMMUNICATION
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE —
Continued
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