DTC Troubleshooting
DTC Troubleshooting: P0135, P0135
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 Initial Inspection and Diagnostic Overview.
- Information marked with an asterisk (*1) applies to '09-10 models.
- Information marked with an asterisk (*2) applies to '11 model.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed at 3,000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
4. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0135 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 A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM.�
5. Turn the ignition switch to LOCK (0).
6. Check the No. 26 LAF (A/F SENSOR) (10A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
YES -
Go to step 7.
NO -
Go to step 21.
7. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
8. Test the A/F sensor relay Testing and Inspection.
Is the A/F sensor relay OK?
YES -
Go to step 10.
NO -
Replace the A/F sensor relay, then go to step 26.
9. Remove the under-cowl panel. Service and Repair
10. Disconnect the A/F sensor (Sensor 1) 4P connector.
11. At the sensor side, measure the resistance between A/F sensor (Sensor 1) 4P connector terminals No. 3 and No. 4.
Is there 1.9-2.7 Ohms at room temperature?
YES -
Go to step 12.
NO -
Go to step 25.
12. At the sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 2 and No. 3, and between terminals No. 2 and No. 4 individually.
Is there continuity?
YES -
Go to step 25.
NO -
Go to step 13.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector C (49P).
15. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and ECM/PCM connector terminal C9.
Is there continuity?
YES -
Go to step 16.
NO -
Repair an open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step 26.
16. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
17. Check for continuity between A/F sensor relay 4P connector terminal No. 1 and body ground.
Is there continuity?
YES -
Go to step 18.
NO -
Repair an open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to step 26.
18. Disconnect ECM/PCM connector A (49P).
19. Connect ECM/PCM connector terminal A22 to body ground with a jumper wire.
20. Check for continuity between A/F sensor relay 4P connector terminal No. 3 and body ground.
Is there continuity?
YES -
Go to step 32.
NO -
Repair an open in the wire between the ECM/PCM (A22) and the A/F sensor relay, then go to step 26.
21. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
22. Remove the under-cowl panel. Service and Repair
23. Disconnect the A/F sensor (Sensor 1) 4P connector.
24. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the A/F sensor relay and the A/F sensor (Sensor 1). Also replace the No. 26 LAF (A/F SENSOR) (10 A) fuse, then go to step 26.
NO -
Replace the under-dash fuse/relay box; USA models Under-Dash Fuse/Relay Box Removal And Installation (USA Models), Canada models Under-Dash Fuse/Relay Box Removal And Installation (Canada Models), then go to step 26.
25. Replace the A/F sensor (Sensor 1) A/F Sensor Replacement.
26. Reconnect all connectors.
27. Turn the ignition switch to ON (II).
28. Reset the ECM/PCM with the HDS.
29. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (A/T).
30. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0135 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step 1.
NO -
Go to step 31.
31. Monitor the OBD STATUS for DTC P0135 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 30, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step 1. If the HDS indicates NOT COMPLETED, go to step 29.
32. Reconnect all connectors.
33. Update the ECM/PCM if it does not have the latest software ECM/PCM Update (A/T), or substitute a known-good ECM/PCM.
34. Start the engine.
35. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P0135 indicated?
YES -
Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 34. If the ECM/PCM was substituted, go to step 1.
NO -
Go to step 36.
36. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM Service and Repair. If any other Pending or Confirmed DTCs were indicated in step 35, go to the indicated DTC's troubleshooting.�
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 34. If the ECM/PCM was substituted, go to step 1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.