P0452
DTC P0452: FTP Sensor Circuit Low Voltage1. Check the vacuum lines at the FTP sensor for improper routing, leakage, breakage and clogging.
Are the vacuum lines OK?
YES - Go to step 2.
NO - Repair or replace vacuum lines as necessary.
2. Reset the PCM.
3. Remove the fuel fill cap.
4. Turn the ignition switch ON (II).
5. Monitor the FTP sensor voltage with the Honda PGM Tester, or measure voltage between body ground and PCM connector terminal A29.
Is there about 2.5 V?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the FTP sensor and the PCM.
NO - Go to step 6.
6. Turn the ignition switch OFF.
7. Reinstall the fuel fill cap.
8. Disconnect the FTP sensor 3P connector.
9. Turn the ignition switch ON (II).
10. Measure voltage between FTP sensor 3P connector terminals No.1 and No.2.
Is there about 5 V ?
YES - Go to step 11.
NO - Repair open in the wire between the FTP sensor and the PCM (C28).
11. Measure voltage between FTP sensor 3P connector terminals No.2 and No.3.
Is there about 5 V?
YES - Replace the FTP sensor.
NO - Go to step 12.
12. Turn the ignition switch OFF.
13. Disconnect the PCM connector A (32P).
14. Check for continuity between FTP sensor 3P connector terminal No.3 and body ground.
Is there continuity?
YES - Repair short in the wire between the FTP sensor and PCM (A29).
NO - Substitute a known-good PCM and recheck. If normal voltage is indicated, replace the original PCM.