ULEV Model
DTC P0453: FTP Sensor Circuit High Voltage (ULEV model)1. Check the vacuum lines at 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 with the HDS.
3. Remove the fuel fill cap.
4. Turn the ignition switch ON (II).
5. Monitor the FTP sensor voltage with the HDS, or measure voltage between body ground and ECM connector terminal E14.
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 3P connector terminals No.1 and No.2.
Is there about 5 V?
YES - Go to step 16.
NO - Go to step 11.
11. Turn the ignition switch OFF.
12. Wait for 1 minute. If the radiator fan is running, wait for 1 minute after the it stops.
13. Disconnect ECM connector E (31P).
14. Connect FTP sensor 3P connector terminal No.2 to body ground with a jumper wire.
15. Check for continuity between ECM connector terminal E4 and body ground.
Is there continuity?
YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.
NO - Repair open in the wire between the ECM (E4) and the FTP sensor.
16. 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 17.
17. Measure voltage between ECM connector terminals E4 and E14.
Is the re about 5 V?
YES - Repair open in the wire between the FTP sensor and the ECM (E14).
NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.