Jeep Wrangler TJ. Manual — part 55
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove Fuse 12 from the PDC.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Using a test light connected to 12 volts, probe the Fused B(+) Circuit.
Does the test light illuminate brightly?
All
Yes
→ Repair the Fused B(+) Circuit Shorted to Ground.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Remove Fuse 12 from the PDC.
The CAB must be connected for the results of this test to be valid.
Using a test light connected to 12 volts, probe the Fused B+ circuit at the PDC fuse
terminal.
Does the test light illuminate brightly?
All
Yes
→ Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
If there are no potential causes remaining, view repair.
All
Continue
Replace the Fuse.
Perform ABS VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Remove Fuse 12 from the PDC.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Fused B+ circuit between the PDC fuse terminal and
the CAB connector.
Is the resistance below 5 ohms?
All
Yes
→ Go To 7
No
→ Repair the Fused B+ circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
7
Remove Fuse 12 from the PDC.
Turn the ignition on.
Measure the voltage of the Fused B+ supply to Fuse 12 in the PDC.
Is the voltage above 10 volts?
All
Yes
→ Go To 8
No
→ Repair the B+ Supply circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
8
If there are no potential causes remaining, view repair.
All
Repair
Replace the Controller Antilock Brake in accordance with the
Service Information.
Perform ABS VERIFICATION TEST - VER 1.
11
BRAKES (CAB)
CAB POWER FEED CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
9
Turn the ignition off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Test Complete.
12
BRAKES (CAB)
CAB POWER FEED CIRCUIT —
Continued
Symptom:
CONTROLLER FAILURE
When Monitored and Set Condition:
CONTROLLER FAILURE
When Monitored:
Ignition on. The CAB monitors its internal microprocessors for correct
operation.
Set Condition:
If the CAB detects an internal fault, the DTC is set.
POSSIBLE CAUSES
GROUND AND POWER CONNECTIONS
GROUND CIRCUIT HIGH RESISTANCE
GROUND CIRCUIT INTERFERENCE
CAB - INTERNAL FAILURE
TEST
ACTION
APPLICABILITY
1
Inspect for non-factory wiring that may interfere with CAB power or ground circuits.
Disconnect the CAB harness connector.
Inspect the CAB wiring harness for incorrect routing and damage.
Inspect the CAB harness and component connectors for corrosion and damage.
Were any concerns found?
All
Yes
→ Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the CAB ground circuits to body ground.
Is the resistance below 1.0 ohm?
All
Yes
→ Go To 3
No
→ Repair the Ground circuit high resistance.
Perform ABS VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the CAB harness connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Turn on all accessories.
Measure the voltage of the Ground circuit.
Is the voltage below 1.0 volts?
All
Yes
→ Go To 4
No
→ Repair as necessary. Unsplice any accessories connected to the
CAB ground circuit. Reroute and shield any high voltage cables
away from the CAB ground circuit.
Perform ABS VERIFICATION TEST - VER 1.
13
BRAKES (CAB)
TEST
ACTION
APPLICABILITY
4
If there are no possible causes remaining, view repair.
All
Repair
Replace the CAB.
Perform ABS VERIFICATION TEST - VER 1.
14
BRAKES (CAB)
CONTROLLER FAILURE —
Continued
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