For a complete wiring diagram Refer to Section 8W.When Monitored:Ignition on.Set Condition:The PCM doesn't receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus. One Trip fault.Possible CausesCAN C BUS CIRCUIT OPEN OR SHORTEDANTI-LOCK BRAKE MODULEPCMAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) .The PCM receives the vehicle speed signal over the CAN C bus from the Anti-lock Brake Module.1. ACTIVE DTCIgnition on, engine not running.With the scan tool, select View DTCs.Is the DTC Active at this time?YesGo To 2 NoRefer to the INTERMITTENT CONDITION Diagnostic Procedure.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2. U0121-LOST COMMUNICATION WITH ABS MODULE ALSO SETWith the scan tool continue reading DTCs.Is the U0121-LOST COMMUNICATION WITH ABS MODULE also set?YesFollow the diagnostics for U0121-LOST COMMUNICATION WITH ABS MODULE. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)