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Home › Acura › 2003 › RSX Base, Automatic › Repair and Diagnosis › Transmission › Automatic Trans › Automatic Transmission › DTC Troubleshooting › DTC P0740: Problem in Lock up Control System › 2002-2004 Models

2002-2004 Models

NOTE:
  • Record all freeze data and review General Troubleshooting Information (see GENERAL TROUBLESHOOTING INFORMATION  ) before you troubleshoot.
  • Keep replacement solenoid valves on hand;
    • A/T clutch pressure control solenoid valves A
    • Shift solenoid valves E
  1. Check whether the scan tool or the HDS indicates another code.

    Does the scan tool or the HDS indicate another code? 

    1. YES -  Perform the troubleshooting for the indicated code(s). Recheck for code P0740 after troubleshooting.
    2. NO -  Go to step 2.
      NOTE: Do not continue with this troubleshooting until the causes of any other DTCs have been corrected.
  2. Drain the ATF (see ATF REPLACEMENT  ) through a strainer. Inspect the strainer for metal debris or excessive clutch material.

    Does the strainer contain metal debris or excessive clutch material? 

    1. YES -  Replace the transmission.
    2. NO -  Replace the ATF (see ATF REPLACEMENT  ), then go to step 3.
  3. Measure the line pressure (see PRESSURE TEST  ).

    Is the line pressure within the service limit? 

    1. YES -  Go to step 4.
    2. NO -  Repair the hydraulic system as necessary or replace the transmission.
  4. Replace the shift solenoid valve E (see SHIFT SOLENOID VALVE REPLACEMENT  ).
  5. Replace the A/T clutch pressure control solenoid valve A (see A/T CLUTCH PRESSURE CONTROL SOLENOID VALVE A REPLACEMENT  ).
  6. Reset the PCM memory by removing the No. 6 (15 A) ECU fuse in the underhood fuse/relay box for more than 10 seconds (see PCM RESET PROCEDURES  ).
  7. Using the scan tool or the HDS, check to be sure that the engine coolant temperature is 176°F (80°C) or above. If the coolant temperature is low, warm up the engine to normal operating temperature (the radiator fan comes on).
  8. Drive the vehicle at the freeze data speed or at 55 mph (88 km/h) in 5th gear for more than 1 minute.
  9. Recheck for code P0740.

    Does the scan tool or the HDS indicate code P0740? 

    1. YES -  Replace the transmission and torque converter.
    2. NO -  The system is OK at this time.
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