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, then wait 5 seconds.
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, 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. 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 ohms at room temperature?
YES - Go to step 9.
NO - Go to step 12.
9. Jump the SCS line with the HDS.
10. Disconnect ECM/PCM connector E (31P).
11. Check for continuity between ECM/PCM connector terminal E19 and body ground.
Is there continuity?
YES - Repair short in the wire between the EVAP canister vent shut valve and the ECM/PCM (E19), then go to step 13.
NO - Go to step 21.
12. Replace the EVAP canister vent shut valve.
13. Reconnect ECM/PCM connector E (31P).
14. Reconnect the EVAP canister vent shut valve 2P connector.
15. Turn the ignition switch ON (II).
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure.
18. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
19. 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 - If Temporary DTC or DTC P0498 is not indicated, or if any other Temporary DTCs or DTCs are indicated, go to step 20.
20. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If there was no Temporary DTCs or DTCs indicated on step 19, troubleshooting is complete. If any other Temporary DTCs or DTCs was indicated on step 19, go to the indicated DTC's 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 18 and recheck.
21. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
22. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
23. 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 22. If the ECM/PCM was substituted, go to step 1.
NO - If Temporary DTC or DTC P0498 is not indicated, or if any other Temporary DTCs or DTCs are indicated, go to step 24.
24. 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 was indicated on step 23, go to the indicated DTC's 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 22. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 22 and recheck.