Jeep XJ. Manual — part 548
Symptom:
*NO TERMINATION FAILURE
POSSIBLE CAUSES
CCD BUS (+) CIRCUIT OPEN
CCD BUS (-) CIRCUIT OPEN
PCM AND INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the PCM C3 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 POWERTRAIN VERIFICATION TEST VER - 2.
2
Turn the ignition off.
Disconnect the PCM C3 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 POWERTRAIN VERIFICATION TEST VER - 2.
3
If there are no possible causes remaining, view repair.
All
Repair
If there are no possible causes remaining, replace the PCM and
the Instrument Cluster. Note: For this Bus Failure Message to
appear both Instrument Cluster and Powertrain Control Modules
would have to be open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
72
COMMUNICATION
Symptom:
*NOT RECEIVING BUS MESSAGES CORRECTLY
POSSIBLE CAUSES
POWERTRAIN CONTROL MODULE
AIRBAG CONTROL MODULE
SENTRY KEY IMMOBILIZER MODULE (IF EQUIPPED)
REMOTE KEYLESS ENTRY MODULE (IF EQUIPPED)
OVERHEAD CONSOLE (IF EQUIPPED)
TRANSMISSION CONTROL MODULE (IF EQUIPPED)
DRB OR DRB CABLE
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Powertrain Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
2
TURN THE IGNITION OFF, DISCONNECT THE BATTERY AND WAIT TWO
MINUTES BEFORE PROCEEDING.
Disconnect the ACM harness connector.
TURN THE IGNITION ON, THEN RECONNECT THE BATTERY.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Airbag Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
3
Turn the ignition off.
Disconnect the SKIM harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Sentry Key Immobilizer Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
73
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the RKE Module harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Remote Keyless Entry Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
5
Turn the ignition off.
Disconnect the Compass Mini Trip Computer (overhead console) harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Compass Mini Trip Computer (Overhead Console).
Perform BODY VERIFICATION TEST - VER 1.
No
→
6
Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB display: BUS OPERATIONAL?
All
Yes
→
Replace the Transmission Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
→
7
Try another DRB and Cable.
Turn the ignition on.
With the DRB, enter SYSTEM MONITORS then CCD Bus Test.
Does the DRB still display: NOT RECEIVING BUS MESSAGES CORRECTLY?
All
Yes
→
Replace the Instrument Cluster.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Repair/replace the DRB or DRB cable as necessary.
Perform BODY VERIFICATION TEST - VER 1.
74
COMMUNICATION
*NOT RECEIVING BUS MESSAGES CORRECTLY —
Continued
Symptom:
*SHORT TO 5 VOLTS FAILURE
POSSIBLE CAUSES
CONTINUITY BETWEEN BUS(+) OR (-) AND 5 VOLT SUPPLY CIRCUITS
POWERTRAIN CONTROL MODULE
BUS (+) OR BUS (-) CIRCUIT SHORTED TO VOLTAGE
DRB OR DRB CABLE
MODULE/COMPONENT SHORTED INTERNALLY
CCD BUS CIRCUIT SHORTED TO A 5 VOLT CIRCUIT
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the PCM C3 harness connector.
Turn the ignition on.
Does the DRB display: BUS OPERATIONAL after disconnecting the PCM?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance between the CCD Bus (+) circuit and the 5 volt supply circuits
at the PCM connectors.
Measure the resistance between the CCD Bus (-) circuit and the 5 volt supply circuits
at the PCM connectors.
Was the resistance below 800.0 ohms on either of the CCD Bus circuits to any 5 volt
supply circuit?
All
Yes
→
Repair the CCD Bus (+) or the CCD Bus (-) circuit for a short to
a 5 volt supply circuit.
Perform BODY VERIFICATION TEST - VER 1.
No
→
Replace the Powertrain Control Module.
Perform BODY VERIFICATION TEST - VER 1.
75
COMMUNICATION
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