DTC Troubleshooting
DTC Troubleshooting: P0498
DTC P0498:
EVAP Canister Vent Shut Valve Circuit Low Voltage
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.
1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. Clear the DTC with the HDS.
3. Check for Pending or Confirmed 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 Pending or Confirmed DTCs with the HDS.
Is DTC P0498 indicated?
YES -
Go to step 6.
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 PCM.
6. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
7. Disconnect the EVAP canister vent shut valve 2P connector.
8. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
9. Measure the 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 an open in the wire between the EVAP canister vent shut valve and the PGM-FI subrelay, then go to step 18.
10. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
11. At the valve side, measure the 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 17.
12. Jump the SCS line with the HDS.
13. Disconnect PCM connector A (49P).
14. Check for continuity between PCM connector terminal A22 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the EVAP canister vent shut valve and the PCM (A22), then go to step 18.
NO -
Go to step 15.
15. Connect EVAP canister vent shut valve 2P connector terminal No. 1 to body ground with a jumper wire.
16. Check for continuity between PCM connector terminal A22 and body ground.
Is there continuity?
YES -
Go to step 25.
NO -
Repair an open in the wire between the EVAP canister vent shut valve and the PCM (A22), then go to step 18.
17. Replace the EVAP canister vent shut valve Service and Repair.
18. Reconnect all connectors.
19. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
20. Reset the PCM with the HDS.
21. Do the PCM idle learn procedure PCM Idle Learn Procedure.
22. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
23. Check for Pending or Confirmed 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 PCM, then go to step 1.
NO -
Go to step 24.
24. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 23, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 22.
25. Reconnect all connectors.
26. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
27. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
28. Check for Pending or Confirmed 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 PCM. If the PCM was updated, substitute a known-good PCM, then go to step 27. If the PCM was substituted, go to step 1.
NO -
Go to step 29.
29. Monitor the OBD STATUS for DTC P0498 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 28, go to the indicated DTC's troubleshooting.
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the EVAP canister vent shut valve and the PCM. If the PCM was updated, substitute a known-good PCM, then go to step 27. If the PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, go to step 27.