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
→
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
→
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
→
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.
29
BRAKES (CAB)
