Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review 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 to ON (II).
- Clear the DTC with the HDS.
- Start the engine, and let it idle 1 minute.
- 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, keep idling until a result comes on.
- Turn the ignition switch to LOCK (0).
- Replace the FTP sensor (see «FTP SENSOR REPLACEMENT»(ref-290849-S28805979572008072200000) ).
- Turn the ignition switch to ON (II).
- Reset the ECM/PCM with the HDS.
- Do «ECM/PCM IDLE LEARN PROCEDURE»(ref-290807-S02808252682008072200000) .
- Start the engine, and let it idle for 1 minute.
- 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 «INDICATED DTCS TROUBLESHOOTING»(ref-290849-S31751815122008072200000) . 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, keep idling until a result comes on.