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P1604-PCM INTERNAL DUAL-PORT RAM READ/WRITE INTEGRITY FAILURE 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 PCM FUSED IGNITION SWITCH CIRCUIT PCM INTERNAL Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. PCM IGNITION CIRCUITS Turn the ignition off. Disconnect the C1 PCM harness connector. Ignition on, engine not running. CAUTION: Do not probe the PCM harness connectors. Probing Perform the above check with the Ignition key in the off lock position, Wiggle the related wire harness while probing the special tool with the Does the test light illuminate brightly? Yes >> Go To 2 No >> Repair the open or excessive resistance in the (F202) and (F924) Fused Ignition Switch (Off, Run, Start) circuits. Inspect the related fuse, if the fuse is open check the circuits for a short to ground. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 820 ENGINE ELECTRICAL DIAGNOSTICS WK |