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• When Monitored: • Set Condition: Possible Causes CAN C BUS CIRCUIT SHORTED CAN C BUS CIRCUIT OPEN ABS MODULE PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Theory of Operation The ABS Module or FCM (NON-ABS) sends vehicle speed information over the CAN C Bus circuit to the PCM. Diagnostic Test 1. ACTIVE DTC NOTE: Diagnose all CAN B and C communication failures before continuing. With a scan tool, read DTCs. Is the U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT IS ACTIVE Continue reading DTCs. Is the U0001-NO COMMUNICATION ON THE CAN C BUS CIRCUIT ACTIVE at this time? Yes >> Refer to the Diagnostic Procedure for the U0001-NO COMMUNICATION ON THE CAN C BUS CIR- CUIT. No >> Go To 3 3. ABS MODULE IS ACTIVE ON THE CAN C BUS With the scan tool, select ECU View. Verify that the ABS Module is active on the bus. Is the ABS Module active on the bus? Yes >> Go To 4 No >> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No Response diagnostic procedures. Perform BODY VERIFICATION TEST – VER 1. 9 - 1004 ENGINE ELECTRICAL DIAGNOSTICS LX |