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Home >> Acura >> 2004 >> MDX Base >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission >> DTC Troubleshooting >> DTC P0705: Short in Transmission Range Switch Circuit (Multiple Shift-position Input)
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DTC P0705: Short in Transmission Range Switch Circuit (Multiple Shift-position Input)

NOTE:
  • Record all freeze data and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION  ) before you troubleshoot.
  • 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 HAS.
  2. Start the engine.
  3. Move the shift lever through all positions, stopping for at least 1 second in each position. Monitor the OBD status for P0705 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the result indicate FAILED? 

    1. YES  - Go to step 4.
    2. NO  - Intermittent failure, the system is OK at this time. Check for an intermittent short in the wire between the transmission range switch, PCM and gauge assembly. If the tester indicates NOT COMPLETED, return to step  2 and recheck.
  4. Inspect the transmission range switch (see TRANSMISSION RANGE SWITCH TEST  ).

    Is the switch OK? 

    1. YES  - With the switch connector disconnected, go to step 5.
    2. NO  - Replace the transmission range switch (see TRANSMISSION RANGE SWITCH REPLACEMENT  ), then go to step  52.
  5. Turn the ignition switch ON (II).
  6. Measure the voltage between transmission range switch connector terminals No. 4 and No. 5.
    Fig 1: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 4 And No. 5
    G03640206Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  12.
    2. NO  - Go to step 7.
  7. Turn the ignition switch OFF.
  8. Jump the SCS line with the HAS.
  9. Disconnect PCM connector B (56P).
  10. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  11. Check for continuity between PCM connector terminal B22 and body ground.
    Fig 2: Checking For Continuity Between PCM Connector Terminal B22 And Body Ground
    G03640207Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B22, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  12. Measure the voltage between transmission range switch connector terminals No. 3 and No. 5.
    Fig 3: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 3 And No. 5
    G03640208Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step  18.
    2. NO  - Go to step 13.
  13. Turn the ignition switch OFF.
  14. Jump the SCS line with the HAS.
  15. Disconnect PCM connector B (56P).
  16. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  17. Check for continuity between PCM connector terminal B23 and body ground.
    Fig 4: Checking For Continuity Between PCM Connector Terminal B23 And Body Ground
    G03640209Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B23, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  18. Measure the voltage between transmission range switch connector terminals No. 8 and No. 5.
    Fig 5: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 8 And No. 5
    G03640210Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  24.
    2. NO  - Go to step 19.
  19. Turn the ignition switch OFF.
  20. Jump the SCS line with the HAS.
  21. Disconnect PCM connector B (56P).
  22. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  23. Check for continuity between PCM connector terminal B21 and body ground.
    Fig 6: Checking For Continuity Between PCM Connector Terminal B21 And Body Ground
    G03640211Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B21, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  24. Measure the voltage between transmission range switch connector terminals No. 2 and No. 5.
    Fig 7: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 2 And No. 5
    G03640212Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  29.
    2. NO  - Go to step 25.
  25. Turn the ignition switch OFF.
  26. Jump the SCS line with the HAS.
  27. Disconnect PCM connector B (56P).
  28. Check for continuity between PCM connector terminal B20 and body ground.
    Fig 8: Checking For Continuity Between PCM Connector Terminal B20 And Body Ground
    G03640213Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B20, transmission range switch, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  29. Measure the voltage between transmission range switch connector terminals No. 7 and No. 5.
    Fig 9: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 7 And No. 5
    G03640214Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  35.
    2. NO  - Go to step 30.
  30. Turn the ignition switch OFF.
  31. Jump the SCS line with the HAS.
  32. Disconnect PCM connector B (56P).
  33. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  34. Check for continuity between PCM connector terminal B19 and body ground.
    Fig 10: Checking For Continuity Between PCM Connector Terminal B19 And Body Ground
    G03640215Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B19, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  35. Measure the voltage between transmission range switch connector terminals No. 1 and No. 5.
    Fig 11: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 1 And No. 5
    G03640216Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  41.
    2. NO  - Go to step 36.
  36. Turn the ignition switch OFF.
  37. Jump the SCS line with the HAS.
  38. Disconnect PCM connector B (56P).
  39. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  40. Check for continuity between PCM connector terminal B18 and body ground.
    Fig 12: Checking For Continuity Between PCM Connector Terminal B18 And Body Ground
    G03640217Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B18, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  41. Measure the voltage between transmission range switch connector terminals No. 6 and No. 5.
    Fig 13: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 6 And No. 5
    G03640218Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Go to step  47.
    2. NO  - Go to step 42.
  42. Turn the ignition switch OFF.
  43. Jump the SCS line with the HAS.
  44. Disconnect PCM connector B (56P).
  45. Disconnect gauge assembly connector A (30P) (see GAUGE ASSEMBLY REPLACEMENT ).
  46. Check for continuity between PCM connector terminal B40 and body ground.
    Fig 14: Checking For Continuity Between PCM Connector Terminal B40 And Body Ground
    G03640219Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B40, transmission range switch, and gauge assembly, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  47. Measure the voltage between transmission range switch connector terminals No. 9 and No. 5.
    Fig 15: Measuring Voltage Between Transmission Range Switch Connector Terminals No. 9 And No. 5
    G03640220Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage (2003-2004 models) or about 5 V (2005-2006 models)? 

    1. YES  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
    2. NO  - Go to step 48.
  48. Turn the ignition switch OFF.
  49. Jump the SCS line with the HAS.
  50. Disconnect PCM connector B (56P).
  51. Check for continuity between PCM connector terminal B24 and body ground.
    Fig 16: Checking For Continuity Between PCM Connector Terminal B24 And Body Ground
    G03640221Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair short in the wire between PCM connector terminal B24, transmission range switch, then go to step  52.
    2. NO  - Update the PCM if it does not have the latest software, or substitute a known-good PCM (see PCM UPDATING AND SUBSTITUTION FOR TESTING  ), then recheck. If the symptom/ indication goes away with a known-good PCM, replace the original PCM.
  52. Clear the DTC with the HAS.
  53. Move the shift lever through all positions, stopping for at least 1 second in each position. Monitor the OBD status for P0705 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail.

    Does the result indicate PASSED? 

    1. YES  - Troubleshooting is complete.
    2. NO  - Return to step  1 and recheck.
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