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NO CAN COMMUNICATIONS WITH PCM (CONTINUED) When Monitored and Set Condition • When Monitored: With the ignition on. • Set Condition: CAN Bus communication failure between the Controller Antilock Brake (CAB) and the Power- POSSIBLE CAUSES CAN C BUS (+) CIRCUIT OPEN CAN C BUS (-) CIRCUIT OPEN CONTROLLER ANTILOCK BRAKE For a complete Brake Assist System (BAS) Circuit Diagram (Refer to 5 - BRAKES/ELECTRICAL - SCHEMATICS Diagnostic Test 1. MEASURE THE RESISTANCE OF THE CAN C BUS (+) CIRCUIT Turn the ignition off. Disconnect the CAB harness connector. Disconnect the PCM harness connector. Note: Check connectors - Clean/repair as necessary. Is the resistance below 1.0 ohm? Yes >> Go to 2 No >> Repair the CAN C Bus (+) circuit for an open. Perform ABS VERIFICATION TEST. ZH BRAKES - ABS ELECTRICAL DIAGNOSTICS 5 - 205 |