DTC Troubleshooting

DTC Troubleshooting: P0451

DTC P0451: FTP Sensor Circuit Range/Performance Problem

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

- If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422 first, then recheck for DTC P0451.

1. Turn the ignition switch to ON (II).

2. Clear the DTC with the HDS.

3. Start the engine, then let it idle for 1 minute.

4. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?
YES - Go to step 5.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and the ECM. If the screen indicates NOT COMPLETED, keep idling until a result comes on.


5. Turn the ignition switch to LOCK (0).

6. Replace the FTP sensor. Service and Repair

7. Turn the ignition switch to ON (II).

8. Reset the ECM with the HDS.

9. Do the ECM idle learn procedure. ECM Idle Learn Procedure

10. Start the engine, then let it idle for 1 minute.

11. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0451 indicated?
YES - Check for poor connections or loose terminals at the FTP sensor and the ECM, then go to step 1.

NO - Go to step 12.


12. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 11, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor and the ECM, then go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.