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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 (see 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 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 PGM-FI subrelay, and the ECM/PCM.

  5. Turn the ignition switch OFF.
  6. Check the No. 11 Fl SUB (15 A) fuse in the under-hood fuse/relay box.

    Is the fuse OK? 

    YES  -Go to step 7.

    NO  -Go to step  20.

  7. Test the PGM-FI subrelay (E) in the under-hood fuse/relay box (see POWER RELAY TEST ).
    Fig 1: Identifying PGM-FI Subrelay
    G06264484Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the PGM-FI subrelay OK? 

    YES  -Go to step 8.

    NO  -Replace the PGM-FI subrelay, then go to step  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.
    Fig 2: Measuring Resistance Between A/F Sensor (Sensor 1) 4P Connector Terminals 3 And 4
    G06264485Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 2.0-2.7 Ω at room temperature? 

    YES  -Go to step 10.

    NO  -Go to step  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.
    Fig 3: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminals 1 And 3
    G06264486Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  23.

    NO  -Go to step 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.
    Fig 4: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal 3 To Body Ground With Jumper Wire
    G06264487Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Check for continuity between ECM/PCM connector terminal C9 and body ground.
    Fig 5: Continuity Between ECM/PCM Connector Terminal C9 And Body Ground
    G06264488Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 15.

    NO  -Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step  25.

  15. Remove the PGM-FI subrelay (E) from the under-hood fuse/relay box.
    Fig 6: Identifying PGM-FI Subrelay
    G06264489Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 7: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal 4 To Body Ground With Jumper Wire
    G06264490Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check for continuity between PGM-FI subrelay 4P connector terminal No. 2 and body ground.
    Fig 8: Checking Continuity Between PGM-FI Subrelay 4P Connector Terminal 2 And Body Ground
    G06264491Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step 18.

    NO  -Repair open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step  24.

  18. Disconnect ECM/PCM connector A (44P).
  19. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and ECM/PCM connector terminal A21.
    Fig 9: Checking Continuity Between PGM-FI Subrelay 4P Terminal 3 And ECM/PCM Connector Terminal A21
    G06264492Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Go to step  31.

    NO  -Repair open in the wire between the ECM/PCM (A21) and the PGM-FI subrelay, then go to step  25.

  20. Remove the PGM-FI subrelay (E) from the under-hood fuse/relay box.
    Fig 10: Identifying PGM-FI Subrelay
    G06264493Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Disconnect the A/F sensor (Sensor 1) 4P connector.
  22. Disconnect the EVAP canister vent shut valve 2P connector.
  23. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.
    Fig 11: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal 4 And Body Ground
    G06264494Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  -Repair short in the wire between the PGM-FI subrelay, the EVAP canister vent shut valve, and the A/F sensor (Sensor 1). Also replace the No. 11 FI SUB (15 A) fuse, then go to step  25.

    NO  -Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ), then go to step  25.

  24. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT  ).
  25. Reconnect all connectors.
  26. Turn the ignition switch ON (II).
  27. Reset the ECM/PCM with the HDS.
  28. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  29. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES  -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step  1.

    NO  -Go to step 30.

  30. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step  29, go to the INDICATED DTCS TROUBLESHOOTING .

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM, then go to step  1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

  31. Reconnect all connectors.
  32. Update the ECM/PCM if it does not have the latest software (see UPDATING THE ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  33. Start the engine, and let it idle.
  34. Check for Temporary DTCs or DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES  -Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  33. If the ECM/PCM was substituted, go to step  1.

    NO  -Go to step 35.

  35. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES  -If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ). If any other Temporary DTCs or DTCs were indicated in step  34, go to the INDICATED DTCS TROUBLESHOOTING .

    NO  -If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the PGM-FI subrelay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  33. If the ECM/PCM was substituted, go to step  1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

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