P0601

P0601-INTERNAL MEMORY CHECKSUM INVALID



- When Monitored:
With the engine running.

- Set Condition:
Internal checksum for software failed, does not match calculated value. One Trip Fault, Three Good Trips to clear.





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

1. DTC IS ACTIVE

NOTE: Diagnose and repair any other DTCs set in the PCM before proceeding with this test.

1. Turn the ignition on.
2. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
3. Start the engine and allow it to reach operating temperature.

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.

4. With the scan tool, select View DTCs.

Is the DTC Active at this time?

Yes

- Go to 2

No

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

2. CHECKING THE PCM POWER AND GROUND CIRCUITS
1. Perform the diagnostic procedure for *CHECKING THE PCM POWER AND GROUND CIRCUITS Checking the PCM Power and Ground Circuits.

Were any problems found?

Yes

- Repair the PCM power and ground circuit(s) as necessary.
- Perform the PCM Verification Test. PCM Verification Test

No

- Go to 3

3. POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the applicable component and the Powertrain Control Module (PCM).
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 Test. PCM Verification Test

No

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