Jeep XJ. Manual — part 546
Symptom:
*NO RESPONSE FROM PCM-ENGINE STARTS (GAS ONLY)
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH ANOTHER VEHICLE
CHECK PCM POWERS AND GROUNDS
TRANSMISSION CONTROL MODULE
CONTROLLER ANTILOCK BRAKE
SCI TRANSMIT CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT SHORTED TO GROUND
SCI RECEIVE CIRCUIT OPEN
SCI TRANSMIT CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
NOTE: Make sure the vehicle starts and runs before proceeding, if not refer
to the appropriate symptom for a no response and a no start condition.
Connect the DRB to another vehicle.
Will the DRB communicate with this vehicle?
All
Yes
→
No
→
Repair or replace the DRB or DRB cable as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
Perform the symptom Checking PCM Power and Ground Circuits in the Driveability
category.
Did the vehicle pass this test?
All
Yes
→
No
→
Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
3
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
4
Turn the ignition off.
Disconnect the TCM harness connector (if equipped).
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Replace the Transmission Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
64
COMMUNICATION
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the CAB harness connector (if equipped).
Measure the resistance between ground and the SCI Transmit circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Transmit circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
Replace the Controller Antilock Brake.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
6
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance between ground and the SCI Receive circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the SCI Receive circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
No
→
7
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Receive circuit between the PCM C3 connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Receive circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
8
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Disconnect the DRB from the DLC.
Measure the resistance of the SCI Transmit circuit between the PCM C3 connector
and the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the SCI Transmit circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
9
NOTE: Ensure the SCI Transmit and Receive circuits are not shorted to
voltage, damage to the PCM may result.
If there are no possible causes remaining, view repair.
All
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
65
COMMUNICATION
*NO RESPONSE FROM PCM-ENGINE STARTS (GAS ONLY) —
Continued
Symptom:
*NO RESPONSE FROM REMOTE KEYLESS ENTRY MODULE
POSSIBLE CAUSES
FUSED B+ OPEN
GROUND CIRCUIT OPEN
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
RKE MODULE - OPEN COMMUNICATION
TEST
ACTION
APPLICABILITY
1
Disconnect the RKE module 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 BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the RKE module harness connector.
Turn all lights off.
Measure the resistance between ground and the Ground circuit in the RKE Module
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the RKE module 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 BODY VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the RKE module 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 BODY VERIFICATION TEST - VER 1.
66
COMMUNICATION
TEST
ACTION
APPLICABILITY
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Remote Keyless Entry Module.
Perform BODY VERIFICATION TEST - VER 1.
67
COMMUNICATION
*NO RESPONSE FROM REMOTE KEYLESS ENTRY MODULE —
Continued
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