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TM-258 < DTC/CIRCUIT DIAGNOSIS > [CVT: RE0F10B] P0744 TORQUE CONVERTER P0744 TORQUE CONVERTER Description INFOID:0000000012200948 This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This is not only caused by electrical malfunction (circuits open or shorted), but also by mechanical malfunction such as control valve sticking, improper solenoid valve operation, etc. DTC Logic INFOID:0000000012200949 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE CAUTION: Always drive vehicle at a safe speed. 1. PREPARATION BEFORE WORK If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test. >> GO TO 2. 2. CHECK DTC DETECTION With CONSULT 1. Start the engine. 2. Select “Data Monitor” in “TRANSMISSION”. 3. Select “RANGE”, “ATF TEMP SEN”, “ACC PEDAL OPEN” and “VEHICLE SPEED”. 4. Drive the vehicle. 5. Maintain the following condition for 30 seconds or more. 6. Stop the vehicle. 7. Select “Self Diagnostic Results” in “TRANSMISSION”. With GST Follow the procedure “With CONSULT”. YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000012200950 1. CHECK LINE PRESSURE Perform line pressure test. Refer to TM-228, "Inspection and Judgment" . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace damaged parts. Refer to TM-228, "Inspection and Judgment" . 2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE Check torque converter clutch solenoid valve. Refer to DTC Trouble diagnosis name DTC detection condition Possible causes P0744 Torque Converter Clutch Cir- Torque converter slip speed is more than a × 0.8) while TCM is in lock-up command state • Hydraulic control circuit RANGE : D position ATF TEMP SEN : 2.03 V or less ACC PEDAL OPEN : 0.0/8 – 1.0/8 VEHICLE SPEED : 40 km/h (25 MPH) |