Jeep XJ. Manual — part 593
TEST
ACTION
APPLICABILITY
10
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field harness connector.
Measure the resistance of the Generator Field Driver circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Generator Field Driver circuit for an open.
Perform CHARGING VERIFICATION - VER-3.
11
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform CHARGING VERIFICATION - VER-3.
24
CHARGING
P1682-CHARGING SYSTEM VOLTAGE TOO LOW - DIESEL —
Continued
Symptom:
P-1685 INVALID SKIM KEY
When Monitored and Set Condition:
P-1685 INVALID SKIM KEY
When Monitored:
With the ignition on.
Set Condition:
The PCM does not receive a valid key message from the SKIM.
POSSIBLE CAUSES
INCORRECT VIN IN PCM
INVALID SKIM KEY NOT PRESENT
NO COMMUNICATION WITH SKIM
NO VIN PROGRAMMED IN THE PCM
PCM
SKIM TROUBLE CODES SET
TEST
ACTION
APPLICABILITY
1
With the DRB III, read the PCM DTCs. Look for P1685.
Turn the ignition on.
Is the Starts Since Set counter for DTC P1685 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III, attempt to communicate with the SKIM.
Can you communicate with the SKIM?
All
Yes
→
No
→
Refer to symptom BUS +/- SIGNAL OPEN FROM SKIM in the
COMMUNICATION category.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition on.
With the DRB III, check for SKIM DTC’s.
Are there any trouble codes set in the SKIM?
All
Yes
→
Repair all SKIM DTC’s.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
25
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
NOTE: If a VIN has not been programmed into the PCM, program VIN into
the PCM and retest.
Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Is there a VIN programmed in the PCM?
All
Yes
→
No
→
Program the correct VIN into the PCM and retest.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition on.
With the DRB III, display the VIN that is programmed in the PCM.
Is the correct VIN programmed in the PCM?
All
Yes
→
No
→
Replace and program the PCM in accordance with the Service
Information.
Perform ROAD TEST VERIFICATION - VER-2.
6
Turn the ignition off.
Replace and program the Sentry Key Immobilizer Module in accordance with the
Service Information.
Turn the ignition on.
With the DRB III, erase all DTCs.
Attempt to start and idle the engine.
With the DRB III, read the PCM DTCs.
Does the DRB III display this code?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
7
NOTE: This DTC could have been set if the SKIM harness connector was
disconnected, or if the SKIM was replaced recently.
NOTE: All keys that the customer uses for this vehicle must be tested to
verify they are operating properly.
Verify the correct VIN is programmed in both the PCM and SKIM modules.
Turn the ignition off.
With the next customer key turn the ignition key on and crank the engine to start.
With the DRB III, read the PCM DTCs. Look for P1685
Is the Starts Since Set Counter for DTC P1685 displayed and equal to 0?
All
Yes
→
Replace the Ignition Key.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Test Complete.
NOTE: If this DTC can not be reset, it may have been an actual theft attempt.
26
COMMUNICATION
P-1685 INVALID SKIM KEY —
Continued
Symptom:
P-1686 NO SKIM BUS MESSAGE RECEIVED
When Monitored and Set Condition:
P-1686 NO SKIM BUS MESSAGE RECEIVED
When Monitored:
With the ignition on.
Set Condition:
The PCM does not receive a CCD Bus message from the SKIM when
expected.
POSSIBLE CAUSES
PCM
INTERMITTENT CONDITION
CCD BUS CIRCUIT(S) OPEN FROM PCM TO SKIM
LOSS OF SKIM COMMUNICATION
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB III, read PCM DTCs. LOOK for P1686.
Is the Starts Since Set counter for DTC P1686 displayed and equal to 0?
All
Yes
→
No
→
2
Turn the ignition on.
With the DRB III, attempt to communicate with the SKIM.
With the DRB III, select Theft Alarm and read the SKIM DTCs.
NOTE: This test will indicate if the Bus is operational from the DLC to the
SKIM.
Can the DRB communicate with the SKIM?
All
Yes
→
No
→
Refer to the appropriate symptom in the COMMUNICATION
category.
Perform ROAD TEST VERIFICATION - VER-2.
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the SKIM harness connector.
Measure the resistance of both CCD Bus circuits between the PCM and the SKIM.
Is the resistance below 5.0 ohms for each measurement?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the CCD Bus circuit(s) for an open.
Perform ROAD TEST VERIFICATION - VER-2.
27
COMMUNICATION
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