DTC P0498 (6-Speed A/T, 16-18 9-Speed A/T)

DTC P0498  : EVAP Canister Vent Shut Valve 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. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0498 EVAP Canister Vent Shut Valve Circuit Low Voltage

   Is DTC P0498 indicated?

   YES 

   Go to step 3.

   NO 

   Go to step 2.

2. Problem verification

   - 1. Select the EVAP TEST in the INSPECTION MENU, and do the EVAP CVS ON in the SINGLE SOLENOID with the HDS.

   SINGLE SOLENOID

   Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0498 EVAP Canister Vent Shut Valve Circuit Low Voltage

   Is DTC P0498 indicated?

   YES 

   The failure is duplicated. Go to step 3.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot - Refer to: How to Troubleshoot the Fuel and Emissions Systems .

3. Open wire check (FI SUB line)

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

   - 2. Disconnect the following connector.

   EVAP canister vent shut valve 2P connector

   - 3. Turn the vehicle to the ON mode.

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

   Test condition	Vehicle ON mode
   	EVAP canister vent shut valve 2P connector: disconnected
   Test point 1	EVAP canister vent shut valve 2P connector No. 1
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The FI SUB wire is OK. Go to step 4.

   NO 

   Repair an open in the FI SUB wire between the EVAP canister vent shut valve and the relay circuit board.

4. EVAP canister vent shut valve internal resistance check

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

   - 2. At the vent shut valve side, measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	EVAP canister vent shut valve 2P connector: disconnected
   Test point 1	EVAP canister vent shut valve 2P connector No. 1 (EVAP canister vent shut valve side)
   Test point 2	EVAP canister vent shut valve 2P connector No. 2 (EVAP canister vent shut valve side)

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

   Is there about 25-30 Ω at room temperature?

   YES 

   The EVAP canister vent shut valve is OK. Go to step 5.

   NO 

   Replace the EVAP canister vent shut valve .

5. Shorted wire check (VSS 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 (51P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	EVAP canister vent shut valve 2P connector: disconnected
   	PCM connector A (51P): disconnected
   Test point 1	PCM connector A (51P) No. 15 - Refer to: PCM Connector for Inputs and Outputs(6-Speed A/T) (2016 2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the VSS wire between the PCM (A15) and the EVAP canister vent shut valve.

   NO 

   The VSS wire is not shorted. Go to step 6.

6. Open wire check (VSS line)

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

   Terminal A

   EVAP canister vent shut valve 2P connector No. 2

   Terminal B

   Body ground

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

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

   Test condition	Vehicle OFF (LOCK) mode
   	EVAP canister vent shut valve 2P connector: disconnected
   	EVAP canister vent shut valve 2P connector No. 2: jumped to body ground
   	PCM connector A (51P): disconnected
   Test point 1	PCM connector A (51P) No. 15 - Refer to: PCM Connector for Inputs and Outputs(6-Speed A/T) (2016 2017 2018 2019 2020), or PCM Connector for Inputs and Outputs (9-Speed A/T) (2016 2017 2018)
   Test point 2	Body ground

   Is there continuity?

   YES 

   The VSS 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 (6-Speed A/T), ('16-'18 9-Speed A/T) .

   NO 

   Repair an open in the VSS wire between the PCM (A15) and the EVAP canister vent shut valve.