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P0642-SENSOR REFERENCE VOLTAGE 1 CIRCUIT LOW (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 (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO GROUND SENSOR SHORTED TO GROUND 5-VOLT SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read DTCs. NOTE: Improperly installed aftermarket accessories can cause this DTC to set. Check for wiring added by Is the DTC 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. (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT SHORTED TO Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect all the Sensors that share the (F855) Primary 5-volt Supply Measure the resistance between ground and the (F855) Primary 5-volt Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (F855) Primary 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 3 HB ENGINE ELECTRICAL DIAGNOSTICS 9 - 699 |