P0605

P0605-INTERNAL CONTROL MODULE ROM

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

After the controller is reset (ignition turned to the RUN position) 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 the program memory.

- When Monitored:
One time after the controller is reset (ignition turned to the RUN position).

- Set Condition:
Whenever the Powertrain Control Module (PCM) detects an internal controller problem.





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

Diagnostic Test
CHECK WIRING AND CONNECTORS FOR INTERMITTENT OPERATION
1. Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits.
2. Wiggle the wires while checking for shorted and open circuits.
3. Check for any Service Bulletins that may apply.

Were there any problems found?

Yes

- Repair the power and/or ground circuits as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

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