P1897

P1897-LEVEL 1 RPM BUS UNLOCK

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Engine running.

- Set Condition:
When the PCM recognizes an internal failure to communicate with the FCM or the CMP and CKP Sensor count periods are too short. One trip fault. ETC light is flashing.





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

Diagnostic Test

1. POWERTRAIN CONTROL MODULE (PCM)
NOTE: Diagnose any CMP or CKP Sensor faults before continuing. Check for intermittent loose CMP or CKP connections.

The Powertrain Control Module is reporting internal errors, view repair to continue.

Repair

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