P0604

P0604-INTERNAL CONTROL MODULE RAM





For a complete wiring diagram Consult Diagrams/Electrical

Theory of Operation

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the TCM detects an error with the controllers Random Access Memory (RAM), the controller will enter Limp-in mode and illuminate the MIL.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
If the TCM detects an error with the controllers Random Access Memory (RAM).





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

Diagnostic Test

1. TRANSMISSION CONTROL MODULE
View repair

Repair

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM. Service and Repair
- Perform NAG1 TRANSMISSION VERIFICATION TEST.Transmission Verification Test