P0605

P0605-INTERNAL CONTROL MODULE ROM

For a complete wiring diagram Consult Diagrams/Electrical.

Theory of Operation

After the controller is reset, the microprocessor checks the integrity of the program memory (ROM). A checksum is calculated by adding all used bytes in the program memory. The sum should be the same as a known constant stored in memory. MIL on after 10 seconds of vehicle operation and transmission will be placed in limp-in.

- When Monitored:
One time after the ignition key is turned to the run position.

- Set Condition:
If the ROM checksum does not match a known constant.





Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview

Diagnostic Test

1. PCM - INTERNAL ERROR
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.
If there are no possible causes remaining, view repair.

Repair

- Replace the Powertrain Control Module. With the scan tool perform Quick Learn, then program Pinion Factor in the Front Control Module.
- Perform 42RLE TRANSMISSION VERIFICATION TEST. Transmission Verification Test