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Home >> Chrysler >> 2003 >> PT Cruiser Limited, Standard >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Chassis Diagnostic Procedures - Anti-Lock Brake System >> Diagnostic Information And Procedures >> Brakes (Cab) - Symptoms >> Symptom: CONTROLLER FAILURE >> Diagnostic Procedure

Diagnostic Procedure

CONTROLLER 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?
  1. Yes --> Repair as necessary.

    Perform ABS VERIFICATION TEST - VER 1 .

  2. No --> Go To 2
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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?
  1. Yes --> Go To 3
  2. No --> Repair the Ground circuit high resistance.

    Perform ABS VERIFICATION TEST - VER 1 .

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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?
  1. Yes --> Go To 4
  2. 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 .

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4 If there are no possible causes remaining, replace the CAB. Perform ABS VERIFICATION TEST - VER 1 . All
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