P1637

P1637-TCM INTERNAL-EEPROM PERFORMANCE





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. This DTC indicates that there is an internal error with the controllers Random Access Memory. If detected, the controller will enter Limp-in mode and illuminate the MIL.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
If the TCM indicates that there is an internal error with the controllers Random Access Memory.





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) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM. Transmission Control Module - Removal
- Perform NAG1 TRANSMISSION VERIFICATION TEST.Transmission Verification Test