P0601

P0601-INTERNAL MEMORY CHECKSUM INVALID

For a complete wiring diagram refer to the Wiring Information Electrical Diagrams

- When Monitored:
With the ignition on.

- Set Condition:
The Powertrain Control Module (PCM) detects an internal failure.





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

1. DTC IS ACTIVE

NOTE: If any other DTCs are set, they must be diagnosed and repaired before continuing this test.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.

1. Ignition on, engine not running.
2. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
3. Monitor the scan tool for at least two minutes.
4. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
5. Start the engine and allow it to reach operating temperature.
6. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go to 2

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking for an Intermittent DTC

2. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the Powertrain Control Module (PCM) wiring and connectors.
2. Look for any chafed, pierced, pinched, or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Search for any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the PCM Verification TestPCM Verification Test.

No

- Replace and program the Powertrain Control Module (PCM).
- Perform the PCM Verification TestPCM Verification Test.