P0135
DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction1. 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 with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
4. Check for Temporary DTCs or DTCs in the DTCs MENU 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) and the ECM/PCM.
5. Turn the ignition switch OFF.
6. Check the following fuses:
- No.19 OPTION (40 A) fuse in under-hood fuse/relay box.
- No.4 A/F SENSOR (15 A) fuse in under-dash fuse/relay box.
- No.23 IGP (7.5 A) fuse in under-dash fuse/relay box.
Are any of the fuses blown?
YES - Repair short in the wire between the A/F sensor relay and the fuses, then go to step 23.
NO - Go to step 7.
7. Disconnect the A/F sensor (Sensor 1) 4P connector.
8. Measure resistance between A/F sensor (Sensor 1) 4P connector terminals No.3 and No.4.
Is there 2.1- 2.9 Ohms at room temperature?
YES - Go to step 9.
NO - Go to step 22.
9. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No.1 and A/F sensor (Sensor 1) 4P connector terminals No.3 and No.4 individually.
Is there continuity?
YES - Go to step 22.
NO - Go to step 10.
10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector A (31P).
12. Check for continuity between ECM/PCM connector terminals A10 and body ground.
Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A10) and the A/F sensor (Sensor 1), then go to step 23.
NO - Go to step 13.
13. Connect the A/F sensor (Sensor 1) 4P connector terminal No.3 to body ground with a jumper wire.
14. Check for continuity between ECM/PCM connector terminal A10 and body ground.
Is there continuity?
YES - Go to step 15.
NO - Repair open in the wire between the ECM/PCM (A10) and the A/F sensor (Sensor 1), then go to step 23.
15. Connect A/F sensor (Sensor 1) 4P connector terminal No.4 to body ground with a jumper wire.
16. Remove the A/F sensor relay (A).
17. Check for continuity between A/F sensor relay terminal No.2. and body ground.
Is there continuity?
YES - Go to step 18.
NO - Repair open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to step 23.
18. Disconnect ECM/PCM connector E (31P).
19. Check for continuity between ECM/PCM connector terminal E8 and the A/F sensor relay terminal No.4.
Is there continuity ?
YES - Go to step 20.
NO - Repair open in the wire between the ECM/PCM (E8) and the A/F sensor relay, then go to step 22.
20. Check the A/F sensor relay.
Is the A/F sensor relay OK ?
YES - Go to step 27.
NO - Replace the A/F sensor relay, then go to step 22.
21. Replace the A/F sensor (Sensor 1).
22. Turn the ignition switch ON (II).
23. Reset the ECM/PCM with the HDS.
24. Do the ECM/PCM idle learn procedure.
25. Check for Temporary DTCs or DTCs in the DTCs MENU 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) and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - Go to step 26.
26. 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) and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 24 and recheck.
27. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
28. Check for Temporary DTCs or DTCs in the DTCs MENU 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), and the A/F sensor relay and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.