Jeep Wrangler TJ. Manual — part 27
Symptom:
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE PCM
CHECK FUSE #7 IN FUSE BLOCK
OPEN GROUND CIRCUITS
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
SCI TRANSMIT CIRCUIT OPEN
CONTROLLER ANTILOCK BRAKE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB attempt to communicate with the PCM.
Was the DRB able to communicate with the PCM?
All
Yes
→ Go To 2
No
→ Refer to symptom list for problems related to No Response From
PCM.
Perform ABS VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Remove and inspect fuse #7 in the Fuse Block.
Is the fuse open?
All
Yes
→ Refer to the wiring diagrams located in the service information to
help isolate a possible short to ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the CAB harness connector.
Using a 12-volt test light connected to 12-volts, probe each ground circuit.
Is the test light illuminated for each circuit?
All
Yes
→ Go To 4
No
→ Repair the ground circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4
Turn the ignition off.
NOTE: Ensure fuse #7 is installed in the Fuse Block.
Disconnect the CAB harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
All
Yes
→ Go To 5
No
→ Repair the Fused Ignition Switch Output circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
105
COMMUNICATION
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Disconnect the CAB harness connector.
Measure the resistance of the SCI Transmit circuit between the CAB connector and
the DLC.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 6
No
→ Repair the SCI Transmit circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
106
COMMUNICATION
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE —
Continued
Symptom:
*NO RESPONSE FROM INSTRUMENT CLUSTER
POSSIBLE CAUSES
OPEN GROUND CIRCUIT
OPEN FUSED IGNITION SWITCH OUTPUT CIRCUIT
OPEN FUSED B+ CIRCUIT
OPEN PCI BUS CIRCUIT
INSTRUMENT CLUSTER
TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Turn all lights off.
Disconnect the Instrument Cluster C1 harness connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?
All
Yes
→ Go To 2
No
→ Repair the ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
All
Yes
→ Go To 3
No
→ Check the fuse in the Fuse Block for an open. Refer to the wiring
diagrams. If ok, repair the Fused Ignition Switch Output circuit
for an open.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the Instrument Cluster C1 harness connector.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit.
Is the test light illuminated?
All
Yes
→ Go To 4
No
→ Repair the Fused B+ circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
107
COMMUNICATION
TEST
ACTION
APPLICABILITY
4
Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Instrument Cluster C2 harness connector.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII
t select Pep Module Tools.
Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again
when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Instrument Cluster connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?
All
Yes
→ Go To 5
No
→ Repair the PCI Bus circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
5
If there are no possible causes remaining, view repair.
All
Repair
Replace the Instrument Cluster in accordance with the service
information.
Perform BODY VERIFICATION TEST - VER 1.
108
COMMUNICATION
*NO RESPONSE FROM INSTRUMENT CLUSTER —
Continued
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