P0499

DTC P0499: EVAP Canister Vent Shut Valve Circuit High Voltage

NOTE: 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, 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 valve2P 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 Ohm 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 22.

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.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0499 is indicated, check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

22. Update the ECM if it does not have the latest software, or substitute a known-good ECM.
23. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
24. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0499 i? indicated, check for poor connections or loose terminals at the EVAP canister vent shut valve and the ECM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM.