P0740

DTC P0740: Problem in Lock-up Control System

NOTE:
^ Record all freeze data 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 OBD II scan tool indicates another code.
Does the OBD II scan tool indicate another code?
YES - Perform the Troubleshooting Flowchart for the indicated Code(s). Recheck for code P0740 after troubleshooting.
NO - Go to step 2.

NOTE: Do not continue with this troubleshooting until the causes of any other DTCs have been corrected.

2. Measure the line pressure.
Is the line pressure within the service limit?
YES - Go to step 3.
NO - Repair the hydraulic system as necessary.
3. Replace the shift solenoid valve E.
4. Replace the A/T clutch pressure control solenoid valve A.
5. Turn the ignition switch OFF, and reset the PCM memory by removing the No. 6 ECU (15 A) fuse in the under-hood fuse/relay box for more than 10 seconds.
6. Using the scan tool, 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).
7. Drive the vehicle at the freeze data speed or at 55 mph (88 km/h) in 5th gear for more than 1 minute.
8. Recheck for code P0740.
Does the OBD II scan tool indicate code P0740?
YES - Replace the transmission and torque converter.
NO - The system is OK at this time.