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Reference Voltage (VREF) Signal Diagnostic Trouble Code (DTC) 3-4: Reference Voltage (VREF) Signal Diagnosis With engine running, TCS indi- Check for a short to body ground 1. Disconnect the PCM connec- tor D (22P) and TCS control unit 14P connectors. 2. Check for continuity between the PCM connector D (22P) ter- minal No. 20 and body ground. Is there continuity? Is there about 5 V? Check for an open in the VREF Measure the voltage between the TCS control unit 14P connector Is there about 5 V? The system is OK at this time. If the problem recurs, replace the TCS control unit. PCM CONNECTOR D (22P) Repair short to body ground in Wire side of female terminals Check for loose PCM connectors. good PCM and recheck. TCS CONTROL UNIT 14P CONNECTOR Repair open in the wire between Wire side of female terminals Main Menu Table of Contents |