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Troubleshooting Flowchart — Lock-up Control System • OBD II Scan Tool indicates Code P0740. • Self-diagnosis indicator light indicates Code 40. Check for Another Code Test Line Pressure: and ). Is the line pressure within the Replace the Torque Converter 1. Replace the torque converter clutch solenoid valves A and ). 2. Turn the ignition switch OFF and reset the PCM by remov- 3. Using the OBD II scan tool, check that the engine coolant 4. Drive the vehicle at 55 mph (88 km/h) constantly for more than one minute. 5. Recheck for code P0740 (40). Does the OBD II scan tool or the indicator light indicate another code? Possible Cause Faulty Lock-up control system Perform the Troubleshooting troubleshooting. NOTE: Do not continue with this trou- Repair the hydraulic system as ). The system is OK at this time. Does the OBD II scan tool or the indicator light indicate another code? Replace the transmission and Main Menu Table of Contents |