DTC P0452 (19-21 9-Speed A/T)

DTC P0452  : Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

NOTE:  Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

DTC (PGM-FI)

1. EVAP system check

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Turn the vehicle to the OFF (LOCK) mode.

   - 4. Insert the emergency fuel funnel into the fuel filler neck.

   NOTE:  The emergency fuel funnel is stored in the maintenance lid of the left side trim panel.

   - 5. Turn the vehicle to the ON mode.

   - 6. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Tank Internal Pressure	Less than -57.21	mmHg

   Do the current condition(s) match the malfunction threshold?

   YES 

   Go to step 3.

   NO 

   Go to step 2.

2. Problem verification

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Remove the emergency fuel funnel from the fuel filler neck.

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

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

   DTC Description	OBD STATUS
   P0452 Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

   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 PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems . If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   FTP sensor 3P connector

   - 3. Turn the vehicle to the ON mode.

   - 4. Check the parameter(s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   Tank Internal Pressure	Less than -57.21	mmHg

   Do the current condition(s) match the malfunction threshold?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Shorted wire check (PTANK line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector A (50P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	FTP sensor 3P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	FTP sensor 3P connector (female terminals) No. 2:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short in the PTANK wire between the PCM (A19) and the FTP sensor.

   NO 

   The PTANK wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) , then recheck. If DTC P0452 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

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

   - 1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	FTP sensor 3P connector: disconnected
   Test point 1	FTP sensor 3P connector (female terminals) No. 3:
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5.0 V?

   YES 

   Replace the FTP sensor .

   NO 

   Go to step 6.

6. Open wire check (VCC2/VCC6 line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector E (80P)

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

   Terminal A	FTP sensor 3P connector (female terminals) No. 3:
   Terminal B	Body ground

   Courtesy of HONDA, U.S.A., INC.

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

   Test condition	Vehicle OFF (LOCK) mode
   	FTP sensor 3P connector: disconnected
   	FTP sensor 3P connector No. 3: jumped to body ground
   	PCM connector E (80P): disconnected
   Test point 1	PCM connector E (80P) No. 76 - Refer to: PCM Connector for Inputs and Outputs (9-Speed A/T) (2019 2020 2021)
   Test point 2	Body ground

   Is there continuity?

   YES 

   The VCC2/VCC6 wire is OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting, or substitute a known-good PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) , then recheck. If DTC P0452 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (9-Speed A/T) (2019 2020 2021) .

   NO 

   Repair an open in the VCC2/VCC6 wire between the PCM (E76) and the FTP sensor.