DTC P0451: FTP Sensor Range/Performance Problem
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- If DTC P2422 is stored at the same time as DTC P0451, troubleshoot DTC P2422 first, then recheck for DTC P0451.
- Turn the ignition switch ON (II).
- Clear the DTC with the HDS.
- Start the engine, then let it idle.
- 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/PCM. If the screen indicates NOT COMPLETED, go to step 3 and recheck.
- Turn the ignition switch OFF.
- Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
- Start the engine, then let it idle.
- 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/PCM, then go to step 1.
NO - Go to step 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/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 10.