P0452
DTC P0452: FTP Sensor Circuit Low Voltage1. Turn the ignition switch ON (II).
2. Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II).
5. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.
Are DTC P0107, P0122 and P0452 simultaneously indicated?
YES - Go to step 23.
NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Remove the fuel fill cap.
8. Turn the ignition switch ON (II).
9. Check the FTP SENSOR in the DATA LIST with the Honda PGM Tester or the HDS.
Is about -7.3 kPa (-55 mmHg, -2.16 in.Hg) or 0.3 V, or less indicated?
YES - Go to step 13.
NO - Go to step 10.
10. Install the fuel fill cap.
11. Start the engine.
12. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the Honda PGM Tester or the HDS.
Does the screen indicate FAILED?
YES - Go to step 13.
NO - If the screen indicates PASSED, intermittent failure, system is OK at this time. If the screen indicates NOT COMPLETED, go to step 8 and recheck.
13. Turn the ignition switch OFF.
14. Disconnect the FTP sensor 3P connector.
15. Turn the ignition switch ON (II).
16. Check the FTP SENSOR in the DATA LIST with the Honda PGM Tester or the HDS.
Is about 7.3 kPa (54.7 mmHg, 2.15 in.Hg), 4.90 V indicated?
YES - Go to step 32
NO - Go to step 17.
17. Measure voltage between the FTP sensor 3P connector terminals No.1 and body ground.
Is there about 5 V?
YES - Go to step 19.
NO - Go to step 18.
18. Measure voltage between ECM/PCM connector terminal E5 and body ground.
Is there 5 V?
YES - Repair open in the wire between the ECM/PCM (E5) and the FTP sensor, then go to step 35.
NO - Go to step 41.
19. Turn the ignition switch OFF.
20. Jump the SCS line with the Honda PGM Tester or the HDS.
21. Disconnect ECM/PCM connector E (31P).
22. 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/PCM (E14) and the FTP sensor, then go to step 34.
NO - Go to step 41.
23. Turn the ignition switch OFF.
24. Jump the SCS line with the Honda PGM Tester or the HDS.
25. Disconnect ECM/PCM connectors A (31P) and E (31P).
26. Disconnect the connectors from the these sensors:
- MAP sensor
- TP sensor
- FTP sensor
- Mainshaft speed sensor
- Countershaft speed sensor
27. Check for continuity between body ground and ECM/PCM connector terminals A20, A21, and E5 individually.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A20, A21, or E5) and each sensor, then go to step 34.
NO - Go to step 28.
28. Reconnect ECM/PCM connectors A (31P) and E (31P).
29. Turn the ignition switch ON (II).
30. Measure voltage between ECM/PCM connector terminal A21 and body ground.
Is there about 5 V?
YES - Go to step 31.
NO - Go to step 41.
31. Continue to monitor voltage at the ECM/PCM connector terminal A21 while reconnecting the following sensors, one at a time.
- MAP sensor
- TP sensor
- FTP sensor
- Mainshaft speed sensor
- Countershaft speed sensor
Did the voltage drop to about 0 V?
YES - Replace the sensor that caused the voltage to drop, then go to step 34.
NO - Go to step 41.
32. Turn the ignition switch OFF.
33. Replace the FTP sensor.
34. Reconnect the ECM/PCM connectors.
35. Reconnect the FTP sensor 3P connector.
36. Turn the ignition switch ON (II).
37. Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS.
38. Do the ECM/PCM idle learn procedure.
39. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0452 is indicated, check for poor connections or loose terminals at the FTP sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Go to step 40.
40. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the Honda PGM Tester or the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
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 38 and recheck.
41. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
42. Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0452 is indicated, check for poor connections or loose terminals at the FTP sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.