| DTC P0135: | A/F Sensor (Sensor 1) Heater Circuit Malfunction |
| 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 (min-1) 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 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.n |
| 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 OK? YES - Go to 7. NO - Go to 20. |
| 7. | Test the PGM-FI subrelay (E) (A) in the under-hood fuse/relay box.
Is the PGM-FI subrelay (E) OK? YES - Go to 8. NO - Replace the PGM-FI subrelay (E), then go to 24. |
| 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 No. 3 and No. 4.
Is there 2.1-2.9 W at room temperature? YES - Go to 10. NO - Go to 23. |
| 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 No. 1 and No. 4 individually.
Is there continuity? YES - Go to 23. NO - Go to 11. |
| 11. | Jump the SCS line with the HDS. |
| 12. | Disconnect ECM/PCM connector C (44P). |
| 13. | Connect 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 C9 and body ground.
Is there continuity? YES - Go to 15. NO - Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to 24. |
| 15. | Remove the PGM-FI subrelay (E) (A) from the under-hood fuse/relay box.
|
| 16. | Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
|
| 17. | Check for continuity between PGM-FI subrelay (E) 4P connector terminal No. 2 and body ground.
Is there continuity? YES - Go to 18. NO - Repair open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay (E), then go to 24. |
| 18. | Disconnect ECM/PCM connector A (44P). |
| 19. | Check for continuity between PGM-FI subrelay (E) 4P connector terminal No. 3 and ECM/PCM connector terminal A21.
Is there continuity? YES - Go to 30. NO - Repair open in the wire between the ECM/PCM (A21) and the PGM-FI subrelay (E), then go to 24. |
| 20. | Remove the PGM-FI subrelay (E) (A) from the under-hood fuse/relay box.
|
| 21. | Disconnect the A/F sensor (Sensor 1) 4P connector. |
| 22. | Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.
Is there continuity? YES - Repair short in the wire between the PGM-FI subrelay (E) and the A/F sensor (Sensor 1). Also replace the No. 11 FI SUB (15 A) fuse, then go to 24. NO - Replace the under-hood fuse/relay box, then go to 24. |
| 23. | Replace the A/F sensor (Sensor 1). |
| 24. | Reconnect all connectors. |
| 25. | Turn the ignition switch ON (II). |
| 26. | Reset the ECM/PCM with the HDS. |
| 27. | Do the ECM/PCM idle learn procedure. |
| 28. | 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 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Go to 29. |
| 29. | Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES - Troubleshooting is complete.n 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 1. If the screen indicates NOT COMPLETED, go to 27 and recheck. |
| 30. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 31. | 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 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |