DTC Troubleshooting

Control System DTCs

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 How To Troubleshoot The Fuel And Emissions Systems.

1. EVAP system check:

EVAP system check
-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 inHg, -55 mmHg), or 0.3 V or less indicated?
-YES- Go to step 3.
-NO- Go to step 2.

2. Problem verification:

Problem verification
-1. Install the fuel fill cap.

-2. Start the engine, and let it idle.

-3. Monitor the OBD STATUS for DTC P0452 with the HDS.

Does the HDS indicate FAILED?
-YES- The failure is duplicated. Go to step 3.
-NO- If the HDS 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 HDS indicates NOT COMPLETED, keep idling until a result comes on.

3. Determine possible failure area (PTANK line, others):

Determine possible failure area (PTANK line, others)
-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.





-3. Turn the ignition switch to ON (II).

-4. Check the FTP SENSOR in the DATA LIST with the HDS.

Is about -7.3 kPa (-2.16 inHg, -55 mmHg), or 0.3 V or less indicated?
-YES- Go to step 4.
-NO- Go to step 5.

4. Shorted wire check (PTANK line):

Shorted wire check (PTANK line)
-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Repair a short in the PTANK wire between the ECM (A37) and the FTP sensor, then do the repair verification.
-NO- The PTANK wire is OK. Update the ECM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM Service and Repair, then do the repair verification.

5. Determine possible failure area (FTP sensor, others):

Determine possible failure area (FTP sensor, others)
-1. Measure the voltage between test points 1 and 2.









Is there about 5.0 V?
-YES- Replace the FTP sensor Service and Repair, then do the repair verification.
-NO- There is a problem in the VCC6 line. Go to step 6.

6. Open wire check (VCC6 line):

Open wire check (VCC6 line)
-1. Turn the ignition switch to LOCK (0).

-2. Jump the SCS line with the HDS.

-3. Disconnect the following connector.





-4. Connect terminals A and B with a jumper wire.









-5. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The VCC6 wire is OK. Update the ECM ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM Service and Repair, then do the repair verification.
-NO- Repair an open in the VCC6 wire between the ECM (A30) and the FTP sensor, then do the repair verification.

Repair verification (OBD STATUS check):

-1. Turn the ignition switch to LOCK (0).

-2. Reconnect all connectors.

-3. Turn the ignition switch to ON (II).

-4. Reset the ECM with the HDS How To Troubleshoot The Fuel And Emissions Systems.

-5. Do the ECM idle learn procedure ECM/PCM Idle Learn Procedure.

-6. Start the engine, and let it idle.

-7. Monitor the OBD STATUS for DTC P0452 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED, FAILED, or NOT COMPLETED?
-PASSED- Troubleshooting is complete. If the ECM was substituted, replace the original ECM Service and Repair. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.
-FAILED- Go to step 1 and recheck. If the ECM was updated, substitute a known-good ECM Service and Repair, then check the OBD STATUS again.
-NOT COMPLETED- Keep idling until a result comes on.