P0498

DTC P0498: EVAP Canister Vent Shut Valve Control Circuit Low 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.
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. Do the 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 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. 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 12.

NO - Go to step 18.

12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector E (31P).




15. Check for continuity between 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 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 PCM connector terminal E10 and body ground.

Is there continuity?

YES - Go to step 25.

NO - Repair open in the wire between the EVAP canister vent shut valve and the 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 PCM with the HDS.
22. Do the PCM idle learn procedure.
23. Do the 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 P0498 is indicated, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM, 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.

25. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
26. Do the EVAP CVS ON in the INSPECTION MENU with the HDS.
27. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0498 is indicated, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

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