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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 GENERAL TROUBLESHOOTING INFORMATION .
  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.
    Fig 1: Identifying Fuse Access Panel & A/F Sensor Relay
    G05952859Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Test the A/F sensor relay (see POWER RELAY TEST ).

    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. (see UNDER-COWL PANEL REPLACEMENT )
  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 Ω at room temperature? 

    YES:  Go to step  12.

    NO:  Go to step  25.

    Fig 2: Measuring Resistance Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 3 & No. 4
    G05952860Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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.

    Fig 3: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 2 & No. 3 & Terminals No. 2 & No. 4
    G05952861Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector C (49P).
  15. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and ECM/PCM connector terminal C9.

    Is there continuity? 

    YES:  Go to step  16.

    NO:  Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step  26.

    Fig 4: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 3 & ECM/PCM Connector Terminal C9
    G05952862Courtesy 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 5: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G05952863Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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 open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to step  26.

    Fig 6: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 1 & Body Ground
    G05952864Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Disconnect ECM/PCM connector A (49P).
  19. Connect ECM/PCM connector terminal A22 to body ground with a jumper wire.
    Fig 7: Connecting ECM/PCM Connector Terminal A22 To Body Ground With Jumper Wire
    G05952865Courtesy of AMERICAN HONDA MOTOR CO., INC.
  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 open in the wire between the ECM/PCM (A22) and the A/F sensor relay, then go to step  26.

    Fig 8: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 3 & Body Ground
    G05952866Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
    Fig 9: Identifying Fuse Access Panel & A/F Sensor Relay
    G05952867Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Remove the under-cowl panel. (see UNDER-COWL PANEL REPLACEMENT )
  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 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, then go to step  26.

    Fig 10: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 4 & Body Ground
    G05952868Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. Replace the A/F sensor (Sensor 1) (see 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 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 screen 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 (see ECM/PCM UPDATE  ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE 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 (see SUBSTITUTING THE ECM/PCM ), then go to step  35. 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 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 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 (see SUBSTITUTING THE 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.

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