DTC Troubleshooting: P0498

DTC P0498: EVAP Canister Vent Shut Valve Circuit Low Voltage

NOTE: Before you troubleshoot, review the general troubleshooting information.

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

EVAP system check:

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 5.


	NO

Go to step 2.

Problem verification:

Problem verification

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

?2.

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.?

DTC check:

DTC check

?1.

Check for Pending or Confirmed DTCs with the HDS.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P1658 ETCS Control Relay ON Malfunction
P1659 ETCS Control Relay OFF Malfunction

Is DTC P1658 and/or P1659 indicated?


	YES

Go to the indicated DTC's troubleshooting.?


	NO

Go to step 4.

Fuse check:

Fuse check

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

?2.

Check the following fuse.

Fuse	No. B30 (10 A)
Location	Under-hood fuse/relay box

Is the fuse OK?


	YES

Go to step 5.


	NO

Replace the No. B30 (10 A) fuse. If the fuse is blown again, repair a short in the No. B30 (10 A) fuse circuit.?

Open wire check (IGP LAF line):

Open wire check (IGP LAF 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
Test condition	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

Is there battery voltage?


	YES

The IGP LAF wire is OK. Go to step 6.


	NO

Repair an open in the IGP LAF wire between the EVAP canister vent shut valve and the No. B30 (10 A) fuse in the under-hood fuse/relay box.?

EVAP canister vent shut valve internal resistance check:

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)

Is there about 25?30 ? at room temperature?


	YES

The EVAP canister vent shut valve is OK. Go to step 7.


	NO

Replace the EVAP canister vent shut valve.?

Shorted wire check (VSV line):

Shorted wire check (VSV line)

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

?2.	Jump the SCS line with the HDS.

?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. 17
Test point 2	Body ground

Is there continuity?


	YES

Repair a short in the VSV wire between the PCM (A17) and the EVAP canister vent shut valve.?


	NO

The VSV wire is not shorted. Go to step 8.

Open wire check (VSV line):

Open wire check (VSV 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

?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. 17
Test point 2	Body ground

Is there continuity?


	YES

The VSV wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If DTC P0498 goes away and the PCM was updated, troubleshooting is complete. If DTC P0498 goes away and the PCM was substituted, replace the original PCM.?


	NO

Repair an open in the VSV wire between the PCM (A17) and the EVAP canister vent shut valve.?