ECM Internal Fault

0984-ECM INTERNAL FAULT

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Ignition on, engine running.

- Set Condition:
When the PCM recognizes an internal failure has occurred. One trip fault.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. POWERTRAIN CONTROL MODULE (PCM)
Check for any TSBs that may apply to this fault code.
Verify that the Powertrain Control Module is at the latest calibration level.
Check the Powertrain Control Module ground circuits with a test light connected to B+.
Check the Powertrain Control Module Fused B+ circuit with a test light connected to ground.
Check the Powertrain Control Module Main Relay circuits with a test light connected to ground.
Do the PCM power and ground circuits light the test light brightly.

Yes

- Replace and program the Powertrain Control Module.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Repair the circuit for an open or shorted condition.
- Perform the Powertrain Verification Test. Powertrain Verification Test.