For a complete wiring diagram Refer to Section 8W.When Monitored:Ignition on and battery voltage greater than 10 volts.Set Condition:Internal PCM failure detected. Two Trip Fault. Three good trips to turn off the MIL.Possible CausesPCM FUSED IGNITION SWITCH CIRCUITPCM INTERNALAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).1. PCM IGNITION CIRCUIT

Turn the ignition off.Disconnect the C1 PCM harness connector.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.With a 12-volt test light connected to ground and with special tool #8815 installed, probe the (F1) Fused Ignition Switch circuit (Off, Run, Start) circuit.Perform the above check with the Ignition key in the off lock position, Ignition on, engine not running position, and during cranking.Wiggle the related wire harness while probing the special tool with the test light to try to interrupt the circuit.Does the test light illuminate brightly?YesGo To 2NoRepair the open or excessive resistance in the (F1) Fused Ignition Switch (Off, Run, Start) circuit. 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) 2. PCMThe Powertrain Control Module is reporting internal errors.Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were there any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoReplace and program the Powertrain Control Module per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)