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U1412-IMPLAUSIBLE VEHICLE SPEED SIGNAL RECEIVED (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. • 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 sends vehicle speed information over the CAN C Bus circuit to the PCM. Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. 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 (NGC) POWERTRAIN VERIFICATION TEST VER - 5. (Refer to 8 - ELECTRICAL/ELEC- 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 9 - 726 ENGINE ELECTRICAL DIAGNOSTICS ND |