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DTC P0720: Problem In Output Shaft (Countershaft) Speed Sensor Circuit

WARNING: This page is about a different car, the 2004 Honda Odyssey, 2003 Honda Odyssey, and 2002 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Record all freeze data and review General Troubleshooting Information (see General Troubleshooting Information ) before you troubleshoot.
  1. Turn the ignition switch ON (II).
  2. Check whether the scan tool or the HDS indicates the code for the manifold absolute pressure (MAP) sensor.

    Does the scan tool or the HDS indicate the code for the MAP sensor? 

    YES  - Perform the Troubleshooting for the MAP sensor. Recheck for code P0720 after troubleshooting.

    NO  - Go to step 3.

  3. Turn the ignition switch OFF.
  4. Disconnect the output shaft (countershaft) speed sensor connector.
  5. Turn the ignition switch ON (II).
  6. Measure the voltage between output shaft (countershaft) speed sensor connector terminal No. 1 and body ground.

    Is there about 5 V? 

    YES  - Go to step 7.

    NO  - Go to step  14.

    Fig 1: Measuring Voltage Between Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 1 & Body Ground
    G01502189Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Turn the ignition switch OFF.
  8. Disconnect PCM connector D (16P).
  9. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.

    Is there continuity? 

    YES  - Repair short to ground in the wire between PCM connector terminal D10 and the output shaft (countershaft) speed sensor.

    NO  - Go to step 10.

    Fig 2: Checking Continuity Between Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 2 & Body Ground
    G01502190Courtesy of AMERICAN HONDA MOTOR CO., INC.
  10. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 3 and body ground.

    Is there continuity? 

    YES  - Go to step 11.

    NO  - Repair open in the wire between PCM connector terminal D16 and the countershaft speed sensor.

    Fig 3: Checking Continuity Between Output Shaft (Countershaft) Speed Sensor Connector Terminal No. 3 & Body Ground
    G01502191Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Turn the ignition switch ON (II).
  12. Measure the voltage between output shaft (countershaft) speed sensor connector terminals No. 2 and No. 3.

    Is there about 5 V? 

    YES  - Go to step  18.

    NO  - Go to step 13.

    Fig 4: Measuring Voltage Between Output Shaft (Countershaft) Speed Sensor Connector Terminals No. 2 & No. 3
    G01502192Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Measure the voltage between PCM connector terminals D10 and D16.

    Is there about 5 V? 

    YES  - Repair open in the wire between PCM connector terminal D10 and the output shaft (countershaft) speed sensor.

    NO  - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.

    Fig 5: Measuring Voltage Between PCM Connector Terminals D10 & D16
    G01502193Courtesy of AMERICAN HONDA MOTOR CO., INC.
  14. Measure the voltage between PCM connector terminal C19 and body ground.

    Is there 4.75-5.25 V? 

    YES  - Repair open in the wire between PCM connector terminal C19 and the output shaft (countershaft) speed sensor.

    NO  - Go to step 15.

    Fig 6: Measuring Voltage Between PCM Connector Terminal C19 & Body Ground
    G01502194Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Turn the ignition switch OFF.
  16. Disconnect PCM connector C (31P).
  17. Check for continuity between PCM connector terminal C19 and body ground.

    Is there continuity? 

    YES  - Repair short to ground in the wire between PCM connector terminal C19 and output shaft (countershaft) speed sensor.

    NO  - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.

    Fig 7: Checking Continuity Between PCM Connector Terminal C19 & Body Ground
    G01502195Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Connect the output shaft (countershaft) speed sensor connector.
  19. Measure the voltage between PCM connector terminals D10 and D16.

    Is there 0 V to about 5 V? 

    YES  - Go to step 20.

    NO  - Replace the output shaft (countershaft) speed sensor (see Output Shaft (Countershaft) Speed Sensor Replacement ).

    Fig 8: Measuring Voltage Between PCM Connector Terminals D10 & D16
    G01502196Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Raise the front of the vehicle, and make sure it is securely supported.
  21. Set the parking brake, and block both rear wheels securely.
  22. Start the engine, then shift to D position and let the wheels spin the vehicle.
  23. Measure the voltage between PCM connector terminals D10 and D16.

    Is there 1.5-3.5 V? 

    YES  - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.

    NO  - Replace the output shaft (countershaft) speed sensor (see Output Shaft (Countershaft) Speed Sensor Replacement ).

    Fig 9: Measuring Voltage Between PCM Connector Terminals D10 & D16
    G01502197Courtesy of AMERICAN HONDA MOTOR CO., INC.
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