DTC Troubleshooting
DTC P0499: EVAP Canister Vent Shut Valve Circuit High 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. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
4. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0499 indicated?
YES - Go to step 5.
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.
5. Turn the ignition switch OFF.
6. Disconnect the EVAP canister vent shut valve 2P connector.
7. Turn the ignition switch ON (II).
8. Measure voltage between EVAP canister vent shut valve 2P connector terminal No. 2 and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Repair open in the wire between the EVAP canister vent shut valve and the A/F sensor relay (LAF), then Go to step 16.
9. Turn the ignition switch OFF.
10. 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 11.
NO - Go to step 15.
11. Jump the SCS line with the HDS.
12. Disconnect ECM connector E (31P).
13. Connect EVAP canister vent shut valve 2P connector terminal No. 1 to body ground with a jumper wire.
14. Check for continuity between ECM connector terminal E19 and body ground.
Is there continuity?
YES - Go to step 23.
NO - Repair open in the wire between the EVAP canister vent shut valve and the ECM (E19), then Go to step 16.
15. Replace the EVAP canister vent shut valve.
16. Reconnect all connectors.
17. Turn the ignition switch ON (II).
18. Reset the ECM with the HDS.
19. Do the ECM idle learn procedure.
20. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
21. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0499 indicated?
YES - Check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM, then Go to step 1.
NO - Go to step 22.
22. Monitor the OBD STATUS for DTC P0499 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTSs were indicated in step 21, 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, then Go to step 1. If the screen indicates NOT COMPLETED, Go to step 20.
23. Reconnect all connectors.
24. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
25. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
26. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0499 indicated?
YES - Check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM. If the ECM was updated, substitute a known-good ECM, then Go to step 25. If the ECM was substituted, Go to step 1.
NO - Go to step 26.
27. Monitor the OBD STATUS for DTC P0499 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. If any other Temporary DTCs or DTCs were indicated in step 26, 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. If the ECM was updated, substitute a known-good ECM, then Go to step 25. If the ECM was substituted, Go to step 1. If the screen indicates NOT COMPLETED, Go to step 25 and recheck.