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Home >> Honda >> 2007 >> Fit Base, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Automatic Transmission) >> DTC Troubleshooting >> DTC P0721: Problem in Output Shaft (Countershaft) Speed Sensor Circuit; DTC P0722: Problem in Output Shaft (Countershaft) Speed Sensor Circuit (No Signal Input)
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DTC P0721: Problem in Output Shaft (Countershaft) Speed Sensor Circuit; DTC P0722: Problem in Output Shaft (Countershaft) Speed Sensor Circuit (No Signal Input)

WARNING: This page is about a different variant/trim than selected.
NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION  .
  • This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
  1. Clear the DTC with the HDS.
  2. Check for proper output shaft (countershaft) speed sensor installation (see OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT ). If the sensor is installed improperly, correct the problem, then go to step  36.
  3. Raise the front of the vehicle, make sure it is securely supported, and allow the all four wheels to rotate freely. Or raise the vehicle on a lift.
  4. Start the engine, and run the vehicle in D with the engine speed at 2,000 rpm or higher for at least 10 seconds. Slowdown, and stop the wheels.
  5. Monitor the OBD status for P0721 or P0722 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate FAILED? 

    YES  - Go to step  6.

    NO  - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the PCM and the output shaft (countershaft) speed sensor connectors. If the HDS indicates NOT COMPLETED, return to step  4 and recheck.

  6. Turn the ignition switch to LOCK (0).
  7. Jump the SCS line with the HDS.
  8. Disconnect PCM connector A (31P).
  9. Check for continuity between PCM connector terminals A8 and body ground, and between A9 and body ground.
    Fig 1: Checking Continuity Between PCM Connector Terminals A8 And Between A9 And Body Ground
    G05455223

    Is there continuity? 

    YES  - Go to step  10.

    NO  - Repair open in the wires between PCM connector terminals A8, A9 and ground (G101), or repair poor ground (G101), then go to step  35.

  10. Connect PCM connector A (31P).
  11. Disconnect the output shaft (countershaft) speed sensor connector.
  12. Turn the ignition switch to ON (II).
  13. Measure the voltage between output shaft (countershaft) speed sensor connector terminal No. 1 and body ground.
    Fig 2: Measuring Voltage Between Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 1 And Body Ground
    G05455224

    Is there about 5 V? 

    YES  - Go to step  14.

    NO  - Go to step  26.

  14. Turn the ignition switch to LOCK (0).
  15. Disconnect PCM connector A (31P).
  16. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
    Fig 3: Checking Continuity Between Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 2 And Body Ground
    G05455225

    Is there continuity? 

    YES  - Repair short in the wire between PCM connector terminal A18 and the output shaft (countershaft) speed sensor connector, then go to step  35.

    NO  - Go to step  17.

  17. Check for continuity between PCM connector terminal A24 and output shaft (countershaft) speed sensor connector terminal No. 3.
    Fig 4: Checking Continuity Between PCM A24 And Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 3
    G05455226

    Is there continuity? 

    YES  - Go to step  18.

    NO  - Repair open in the wire between the output shaft (countershaft) speed sensor connector and PCM connector terminal A24, then go to step  35.

  18. Connect PCM connector A (31P).
  19. Turn the ignition switch to ON (II).
  20. Measure the voltage between output shaft (countershaft) speed sensor connector terminals No. 2 and No. 3.
    Fig 5: Measuring Voltage Between Output Shaft (Countershaft) Speed Sensor Connector Terminals No. 2 And No. 3
    G05455227

    Is there about 5 V? 

    YES  - Go to step  21.

    NO  - Go to step  25.

  21. Connect the output shaft (countershaft) speed sensor connector.
  22. Measure the voltage between PCM connector terminals A18 and A8 or A9.
    Fig 6: Measuring Voltage Between PCM Connector Terminals A18 And A8 Or A9
    G05455228

    Is there voltage 0 V or about 5 V? 

    YES  - Go to step  23.

    NO  - Replace the output shaft (countershaft) speed sensor (see OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT ), then go to step  36.

  23. Start the engine, and run the vehicle in D.
  24. While holding the engine at an engine speed 2,000 rpm or higher, measure the voltage between PCM connector terminals A18 and A8 or A9.
    Fig 7: Measuring Voltage Between PCM Connector Terminals A18 And A8 Or A9
    G05455229

    Is there 1.5-3.5 V? 

    YES  - Go to step  31.

    NO  - Replace the output shaft (countershaft) speed sensor (see OUTPUT SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT ), then go to step  36.

  25. Measure the voltage between PCM connector terminals A18 and A8 or A9.
    Fig 8: Measuring Voltage Between PCM Connector Terminals A18 And A8 Or A9
    G05455230

    Is there about 5 V? 

    YES  - Repair open in the wire between PCM connector terminal A18 and the output shaft (countershaft) speed sensor, then go to step  35.

    NO  - Go to step  30.

  26. Measure the voltage between PCM connector terminals A21 and A8 or A9.
    Fig 9: Measuring Voltage Between PCM Connector Terminals A21 And A8 Or A9
    G05455231

    Is there about 5 V? 

    YES  - Repair open in the wire between PCM connector terminal A21 and the output shaft (countershaft) speed sensor, then go to step  35.

    NO  - Go to step  27.

  27. Turn the ignition switch to LOCK (0).
  28. Disconnect PCM connector A (31P).
  29. Check for continuity between PCM connector terminal A21 and body ground.
    Fig 10: Checking Continuity Between PCM Connector Terminal A21 And Body Ground
    G05455232

    Is there continuity? 

    YES  - Repair short in the wire between PCM connector terminal A21 and the output shaft (countershaft) speed sensor, then go to step  35.

    NO  - Go to step  30.

  30. Reconnect all connectors.
  31. Update the A/T software in the PCM if it does not have the latest software (see UPDATING THE PCM ), or substitute a known-good PCM (see SUBSTITUTING THE PCM ).
  32. Start the engine, and run the vehicle in D with the engine speed at 2,000 rpm or higher for at least 10 seconds. Slow down, and stop the wheels.
  33. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

    Is DTC P0721 or P0722 indicated? 

    YES  - If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1.

    NO  - Go to step  34.

  34. Monitor the OBD status for P0721 or P0722 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate PASSED? 

    YES  - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM (see ECM/PCM REPLACEMENT ). If any other DTCs were indicated on step 33, go to the indicated DTC's troubleshooting.

    NO  - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM (see SUBSTITUTING THE PCM ), then recheck. If the PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, return to step  32 and recheck.

  35. Reconnect all connectors.
  36. Clear the DTC with the HDS.
  37. Start the engine, and run the vehicle in D with the engine speed at 2,000 rpm or higher for at least 10 seconds. Slow down, and stop the wheels.
  38. Check for DTC(s) in the DTCs/Freeze Data in A/T Mode Menu with the HDS.

    Is DTC P0721 or P0722 indicated? 

    YES  - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step  1.

    NO  - Go to step  39.

  39. Monitor the OBD status for P0721 or P0722 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the HDS indicate PASSED? 

    YES  - Troubleshooting is complete. If any other DTCs were indicated on step 38, go to the indicated DTC's troubleshooting.

    NO  - Check for poor connections and loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step  1. If the HDS indicates NOT COMPLETED, return to step  37 and recheck.

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