P0452
DTC P0452: FTP Sensor Circuit Low VoltageNOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
1. Check the vacuum lines of the FTP sensor for misrouting, 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 ECM.
3. Remove the fuel fill cap.
4. Turn the ignition switch ON (II).
5. Monitor FTP sensor voltage with the HDS, or measure voltage between body ground and ECM connector terminal A29.
Is there about 2.5 V?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FTP sensor and at the ECM.
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 12.
NO - Go to step 11.
11. Measure voltage between ECM connector terminals C28 and C18.
Is there about 5 V?
YES - Repair open in the wire between the ECM (C28)and the FTP sensor.
NO - Substitute a known-good ECM, If the FTP sensor readings are now normal, replace the original ECM.
12. 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 13.
13. Turn the ignition switch OFF.
14. Disconnect ECM connector A (32P).
15. 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 the ECM (A29).
NO - Substitute a known-good ECM and recheck. If the FTP sensor readings are now normal, replace the original ECM.