DTC Troubleshooting: P0135 (41)

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 (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