DTC Troubleshooting
DTC P0498: EVAP Canister Vent Shut Valve Circuit Low VoltageNOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0498 indicated?
YES - Go to step 6.
NO - Go to step 4.
4. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
5. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0498 indicated?
YES - Go to step 6.
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 ECM/PCM.
6. Turn the ignition switch OFF.
7. Disconnect the EVAP canister vent shut valve 2P connector.
8. Turn the ignition switch ON (II).
9. Measure voltage between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 10.
NO - Repair open in the wire between the EVAP canister vent shut valve and the A/F sensor relay then go to step 19.
10. Turn the ignition switch OFF.
11. At the valve side, measure resistance between EVAP canister vent shut valve 2P connector terminals No. 1 and No. 2.
Is there about 25 - 30 ohm at room temperature?
YES - Go to step 12.
NO - Go to step 18.
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector E (31P).
15. Check for continuity between ECM/PCM connector terminal E10 and body ground.
Is there continuity?
YES - Repair short in the wire between the EVAP canister vent shut valve and the ECM/PCM (E10), then go to step 19.
NO - Go to step 16.
16. Connect EVAP canister vent shut valve 2P connector terminal No. 1 to body ground with a jumper wire.
17. Check for continuity between ECM/PCM connector terminal E10 and body ground.
Is there continuity?
YES - Go to step 26.
NO - Repair open in the wire between the EVAP canister vent shut valve and the ECM/PCM (E10), then go to step 19.
18. Replace the EVAP canister vent shut valve.
19. Reconnect all connectors.
20. Turn the ignition switch ON (II).
21. Reset the ECM/PCM with the HDS.
22. Do the ECM/PCM idle learn procedure.
23. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
24. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0498 indicated?
YES - Check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM/PCM, then go to step 1.
NO - Go to step 25.
25. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 24, go to the indicated DTCs troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 23.
26. Reconnect all connectors.
27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
28. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
29. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0498 indicated?
YES - Check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 28. If the ECM/PCM was substituted, go to step 1.
NO - Go to step 30.
30. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs were indicated in step 29, go to the indicated DTCs troubleshooting.
NO - If the screen indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 28. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 28.