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P1618-SENSOR REFERENCE VOLTAGE 1 CIRCUIT ERRATIC For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO GROUND (F855) PRIMARY 5-VOLT SUPPLY SHORTED TO BATTERY VOLTAGE (F855) PRIMARY 5-VOLT SUPPLY CIRCUIT OPEN 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. 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 GROUND Turn the ignition off. Disconnect the PCM harness connectors. Disconnect all the Sensors that share the (F855) Primary 5-volt Supply NOTE: This code can be caused by the improper installation of 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 9 - 688 ENGINE ELECTRICAL DIAGNOSTICS LX |