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TM-64 < COMPONENT DIAGNOSIS > [CVT: RE0F09B] P0744 A/T TCC S/V FUNCTION (LOCK -UP) P0744 A/T TCC S/V FUNCTION (LOCK -UP) Description INFOID:0000000003848980 This malfunction is detected when the torque converter clutch does not lock-up as instructed by the TCM. This DTC Logic INFOID:0000000003848981 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE CAUTION: Always drive vehicle at a safe speed. 1. CHECK DTC DETECTION With CONSULT-III 1. Turn ignition switch ON. 2. Select “Data Monitor” mode for “TRANSMISSION”. 3. Start engine and maintain the following condition for at least 30 seconds. With GST Follow the procedure “With CONSULT-III”. YES >> Go to NO >> Check intermittent incident. Refer to GI-35, "Intermittent Incident" . Diagnosis Procedure INFOID:0000000003848982 1. CHECK LINE PRESSURE Perform line pressure test. Refer to TM-146, "Inspection and Judgment" . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace damaged parts. Refer to TM-146, "Inspection and Judgment" . 2. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE 1. Turn ignition switch OFF. 2. Disconnect CVT unit connector. 3. Check torque converter clutch solenoid valve. Refer to TM-65, "Component Inspection (Torque Converter . Is the inspection result normal? DTC Item (CONSULT-III screen term) Malfunction is detected when... Possible cause P0744 A/T TCC S/V FNCTN • CVT cannot perform lock-up even if elec- trical circuit is good. • TCM detects as irregular by comparing reference value with slip rotation. • There is a big difference between engine speed and primary speed sensor when • Torque converter clutch solenoid valve ACC PEDAL OPEN : More than 1.0/8 RANGE : “D” position VEHICLE SPEED : Constant speed of more than 40 km/h (25 MPH) |