LEMON Manuals: Even more car manuals for everyone
Home >> Acura >> 2007 >> RDX >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction >> Notes

DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction: Notes

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 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 PCM.

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

    Is the fuse OK? 

    YES  - Go to step  8.

    NO  - Go to step  21.

  7. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
    Fig 1: Identifying PGM-FI Subrelay
    G00485326Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Test the PGM-FI subrelay (see POWER RELAY TEST ).

    Is the PGM-FI subrelay OK? 

    YES  - Go to step  9.

    NO  - Replace the PGM-FI subrelay, then go to step  28.

  9. Disconnect the A/F sensor (Sensor 1) 4P connector.
  10. 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 No. 3 And 4
    G05444500Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there 2.0-2.7 Ω, at room temperature? 

    YES  - Go to step  11.

    NO  - Go to step  26.

  11. 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.
    Fig 3: Checking Continuity Between A/F Sensor 4P Connector Terminals No. 2 And No. 3, And Between Terminals No. 2 And 4
    G05444501Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  26.

    NO  - Go to step  12.

  12. Jump the SCS line with the HDS.
  13. Disconnect PCM connector C (44P).
  14. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 4: Connecting A/F Sensor 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G05444502Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check for continuity between PCM connector terminal C9 and body ground.
    Fig 5: Checking Continuity Between PCM Connector Terminal C9 And Body Ground
    G05444503Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  16.

    NO  - Repair open in the wire between the PCM (C9) and the A/F sensor (Sensor 1), then go to step  27.

  16. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
    Fig 6: Identifying PGM-FI Subrelay
    G00485326Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Connect A/F sensor (Sensor 1) 4P connector terminal No. 3 to body ground with a jumper wire.
    Fig 7: Connecting A/F Sensor 4P Connector Terminal No. 3 To Body Ground With Jumper Wire
    G05444505Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. 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 No. 2 And Body Ground
    G05444506Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  19.

    NO  - Repair open in the wire between the A/F sensor (Sensor 1) and the PGM-FI subrelay, then go to step  27.

  19. Disconnect PCM connector A (44P).
  20. Check for continuity between PGM-FI subrelay 4P connector terminal No. 3 and PCM connector terminal A21.
    Fig 9: Checking Continuity Between PGM-FI Subrelay 4P Connector Terminal No. 3 And PCM Connector Terminal A21
    G05444507Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Go to step  33.

    NO  - Repair open in the wire between the PCM (A21) and the PGM-FI subrelay, then go to step  27.

  21. Remove the PGM-FI subrelay (A) from the under-hood fuse/relay box.
    Fig 10: Identifying PGM-FI Subrelay
    G00485326Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Disconnect the A/F sensor (Sensor 1) 4P connector.
  23. Disconnect the EVAP canister purge valve 2P connector.
  24. Disconnect the EVAP canister vent shut valve 2P connector.
  25. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and body ground.
    Fig 11: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 3 And Body Ground
    G05444509Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    YES  - Repair short in the wire between the PGM-FI subrelay, the EVAP canister purge valve, the EVAP canister vent shut valve, and the A/F sensor (Sensor 1). Also replace the No. 11 LAF (15A) fuse, then go to step  27.

    NO  - Replace the under-hood fuse/relay box (see REMOVAL AND INSTALLATION ), then go to step  27.

  26. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT ).
  27. Reconnect all connectors.
  28. Turn the ignition switch ON (II).
  29. Reset the PCM with the HDS.
  30. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  31. 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 PCM, then go to step  1.

    IMO-Go to step  32.

  32. 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 30, 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 PCM, then go to step  1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

  33. Reconnect all connectors.
  34. Update the PCM if it does not have the latest software (see PCM UPDATE ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  35. Start the engine, and let it idle.
  36. 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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  35. If the PCM was substituted, go to step  1.

    NO  - Go to step  37.

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

    Does the screen indicate PASSED? 

    YES  - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see PCM REPLACEMENT ). If any other Temporary DTCs or DTCs were indicated in step 35, 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 PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then go to step  35. If the PCM was substituted, go to step  1. If the screen indicates NOT COMPLETED, keep idling until a result comes on.

scientia non olet · About LEMON Manuals