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P1604-PCM INTERNAL DUAL-PORT RAM READ/WRITE INTEGRITY FAILURE 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 PCM harness connectors. Ignition on, engine not running. CAUTION: Do not probe the PCM harness connectors. Probing the 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. Perform the POWERTRAIN VERIFICATION TEST. (Refer 2. PCM The Powertrain Control Module is reporting internal errors. 9 - 684 ENGINE ELECTRICAL DIAGNOSTICS LX |