P1601

P1601-INTERNAL TCM COMPUTER ERROR

For a complete wiring diagram Refer to the Wiring Information.

Theory of Operation

The Transmission Control Module (TCM) checks the integrity of each RAM location by writing to it and reading back from it. The read value should be the same as the written value. The transmission will be placed into limp-in mode.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
When the TCM detects an error with the controllers processor.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. 8HP45 Pre-Diagnostic Troubleshooting Procedure

TRANSMISSION CONTROL MODULE

View repair

Repair

- Using the schematics as a guide, check the Transmission Control Module Assembly (TCMA) terminals for corrosion, damage or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCMA. Valve Body - Removal.
- Perform the TRANSMISSION VERIFICATION TEST. Verification Tests.