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 and '11-12 models (M/T).
- Information marked with an asterisk (*2) applies to '11-12 models (A/T).
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 ECM/PCM connector terminal C9 and A/F sensor (Sensor 1) 4P connector terminal No. 3.
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.
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, 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.