DTC Troubleshooting

DTC Troubleshooting: P0452

DTC P0452: FTP Sensor Circuit Low Voltage

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

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

2. Clear the DTC with the HDS.

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

4. Remove the fuel fill cap.

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

6. Check the FTP SENSOR in the DATA LIST with the HDS.

Is about -7.3 kPa (-2.16 in.Hg, -55 mmHg), or 0.3 V or less indicated?
YES - Go to step 10.

NO - Go to step 7.


7. Install the fuel fill cap.

8. Start the engine, and let it idle without load (in neutral) until the radiator fan comes on.

9. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?
YES - Go to step 10.

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, go to step 4 and recheck.


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

11. Disconnect the FTP sensor 3P connector.

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

13. Check the FTP SENSOR in the DATA LIST with the HDS.

Is about -7.3 kPa (-2.16 in.Hg, -55 mmHg), or 0.3 V or less indicated?
YES - Go to step 16.

NO - Go to step 14.


14. Measure the voltage between FTP sensor 3P connector terminal No. 1 and body ground.

Is there about 5 V?
YES - Go to step 20.

NO - Go to step 15.






15. Measure the voltage between ECM connector terminal E5 and body ground.

Is there 5 V?
YES - Repair open in the wire between the ECM (E5) and the FTP sensor, then go to step 22.

NO - Go to step 28.






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

17. Jump the SCS line with the HDS.

18. Disconnect ECM connector E (31P).

19. Check for continuity between FTP sensor 3P connector terminal No. 2 and body ground.

Is there continuity?
YES - Repair short in the wire between the ECM (E14) and the FTP sensor, then go to step 22.

NO - Go to step 29.






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

21. Replace the FTP sensor. Service and Repair

22. Reconnect all connectors.

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

24. Reset the ECM with the HDS.

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

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

Is DTC P0452 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 27.


27. Monitor the OBD STATUS for DTC P0452 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 26, 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.


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

29. Reconnect all connectors.

30. Update the ECM if it does not have the latest software, ECM Update or substitute a known-good ECM. Initial Inspection and Diagnostic Overview

31. Start the engine, and let it idle without load (in neutral) until the radiator fan comes on.

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

Is DTC P0452 indicated?
YES - Check for poor connections or loose terminals at the FTP sensor and the ECM. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then go to step 31. If the ECM was substituted, go to step 1.

NO - Go to step 33.


33. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. Service and Repair If any other Temporary DTCs or DTCs were indicated in step 32, 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. If the ECM was updated, substitute a known-good ECM, Initial Inspection and Diagnostic Overview then go to step 31. If the ECM was substituted, go to step 1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.