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.
- Information marked with an asterisk (*) applies to '06-08 models.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS, then wait 5 seconds.
3. Select the 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/PCM.
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 - '04-05 models: Repair open in the wire between the EVAP canister vent shut valve and the No. 18 ACG (15 A) fuse in the under-dash fuse/relay box, then go to step 16.
'06-08 models: 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/PCM 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/PCM 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/PCM (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/PCM with the HDS.
19. Do the ECM/PCM idle learn procedure.
20. Select the 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/PCM, 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 indicates PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 21, 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 20.
23. Reconnect all connectors.
24. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
25. Select the 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/PCM, then go to step 1.
NO - Go to step 27.
27. Monitor the OBD STATUS for P0499 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 26, 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 25. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 25.