Codes P0135 and P0498

Hi Devin,

Here is complete trouble shooting:

DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

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. Start the engine. Hold the engine speed at 3,000 rpm without load (in park or neutral) until the radiator fan comes on, then let it idle.
4. Check for temporary DTCs or DTCs with the HDS.

Is DTC P0135 indicated?

Yes - Go to step 5.

NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay (E), and the ECM/PCM.

5. Turn the ignition switch off.
6. Check the No. 11 FI SUB (15 A) fuse in the under-hood fuse/relay box.

Is the fuse okay?

Yes - Go to step 7.

No - Go to step 18.

7. Test the PGM-FI subrelay (E) (A) in the under-hood fuse/relay box.(Check picture 1)

Is the PGM-FI subrelay (E) okay?

Yes - Go to step 8.

No - Replace the PGM-FI subrelay (E), then go to step 23.

8. Disconnect the A/F sensor (Sensor 1) 4P connector.
9. At the sensor side, measure resistance between A/F sensor (Sensor 1) 4P connector terminals number. 3 and No. 4.(Check picture 2)

Is there 1.9 - 2.5 Ohm, at room temperature?

Yes - Go to step 10.

NOo - Go to step 22.

10. At the sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 1 and No. 3, and between terminals number. 1 and No. 4 individually.(Check picture 3)

Is there continuity?

Yes - Go to step 22.

No - Go to step 11.

11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector C (44P).
13. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and ECM/PCM connector terminal C9.(Check picture 4)

Is there continuity?

Yes - Go to step 14.

No - Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step 23.
14. Remove the PGM-FI subrelay (E) (A) from the under-hood fuse/relay box.(Check picture 5)
15. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and PGM-FI subrelay (E) 4P connector terminal No. 2.(Check picture 6)

Is there continuity?

Yes - Go to step 16.

No - Repair open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay (E), then go to step 23.

16. Disconnect ECM/PCM connector A (44P).

17. Check for continuity between PGM-FI subrelay (E) 4P connector terminal No. 3 and ECM/PCM connector terminal A21.(Check pic7)

Is there continuity?

Yes - Go to step 29.

No - Repair open in the wire between the ECM/PCM (A21) and the PGM-FI subrelay (E), then go to step 23.
18. Remove the PGM-FI subrelay (E) (A) from the under-hood fuse/relay box.(Check picture 8)
19. Disconnect the A/F sensor (Sensor 1) 4P connector.
20. Disconnect the EVAP canister vent shut valve 2P connector.
21. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.(Check picture 9)

Is there continuity?

Yes - Repair short in the wire between the PGM-FI subrelay (E) and the A/F sensor (Sensor 1), and the EVAP canister vent shut valve. Also replace the No. 11 FI SUB (15 A) fuse, then go to step 23.

NO - Replace the under-hood fuse/relay box, then go to step 23.

22. Replace the A/F sensor (Sensor 1).
23. Reconnect all connectors.
24. Turn the ignition switch ON (II).
25. Reset the ECM/PCM with the HDS.
26. Do the ECM/PCM idle learn procedure.
27. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

Yes - If DTC P0135 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay (E), and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 28.

28. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

Yes - Troubleshooting is complete.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay (E), and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 26 and recheck.

29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
30. Start the engine.
31. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0135 indicated?

Yes - Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay (E), and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 30. If the ECM/PCM was substituted, go to step 1.

NO - If no Temporary DTCs or DTCs are indicated, go to step 32. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

32. Monitor the OBD STATUS for DTC P0135 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.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay (E), and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 30. If the ECM/PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, let the engine idle until a result comes on.
-trouble shooting for fault code 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. Select 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 ECM/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.(Check pic10)

Is there battery voltage?

Yes - Go to step 10.

NO - Repair open in the wire between the EVAP canister vent shut valve and the PGM-FI subrelay (E), then go to step 18.

10. Turn the ignition switch OFF.
11. Measure resistance between EVAP canister vent shut valve 2P connector terminals No. 1 and No. 2.(Check pic 11)

Is there about 25 - 30 Ohm at room temperature?

Yes - Go to step 12.

NO - Go to step 17.

12. Jump the SCS line with the HDS.
13. Disconnect ECM/PCM connector A (44P).
14. Check for continuity between ECM/PCM connector terminal A10 and body ground.(Check pic12)

Is there continuity?

Yes - Repair short in the wire between the EVAP canister vent shut valve and the ECM/PCM (A10), 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.(Check pic 13)
16. Check for continuity between ECM/PCM connector terminal A10 and body ground.(Check pic 14)

Is there continuity?

Yes - Go to step 24.

NO - Repair open in the wire between the EVAP canister vent shut valve and the ECM/PCM (A10), then go to step 18.

17. Replace the EVAP canister vent shut valve.
18. Reconnect all connectors.
19. Turn the ignition switch ON (II).
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure.
22. Select EVAP CVS ON in the INSPECTION MENU with the HDS.
23. 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 ECM/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.

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

NO - 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 are indicated, go to the indicated DTC's troubleshooting.