P0742

DTC P0742 TORQUE CONVERTER CLUTCH CIRCUIT - STUCK ON

COMPONENT LOCATION
Refer to DTC P0741. P0741

GENERAL DESCRIPTION
Refer to DTC P0741. P0741

DTC DESCRIPTION
The PCM increases duty ratio, to engage the Damper Clutch, by monitoring slip rpms. (difference in value between engine speed and turbine speed). However, If a very small amount of slip rpm is maintained, the PCM applies 0% duty ratio value, then the PCM judges that the Torque Converter Clutch is stuck ON and sets this code.

DTC DETECTING CONDITION:

SCHEMATIC DIAGRAM
Refer to DTC P0741. P0741

MONITOR SCANTOOL DATA
1. Connect Scantool to data link connector(DLC).
2. Engine "ON".
3. Select "D RANGE" and drive vehicle.
4. Monitor the "TORQUE CONVERTER(DAMPER) CLUTCH" parameter on the Scantool.
Specification: TCC SLIP > 5RPM > (In condition that TCC SOL. DUTY 0%)





5. Is "TCC SLIP" within specifications?
YES
^ Fault is intermittent caused by poor contact in the sensors and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of vehicle repair" procedure.

NO
^ Go to "Component inspection" procedure.

COMPONENT INSPECTION
1. CHECK TORQUE CONVERTER CLUTCH SOLENOID VALVE
1) Connect Scantool to data link connector(DLC).
2) Ignition "ON" & Engine "OFF".
3) Select A/T solenoid valve actuator test and operate actuator test.
4) Can you hear operating tone for using TCC SOLENOID VALVE actuator testing function?
YES
^ Go to "CHECK OIL PRESSURE" as below.
NO
^ Repair or replace as necessary and then go to "Verification of vehicle repair" procedure.

2. CHECK OIL PRESSURE





1) Connect oil pressure gauge to "DR" port.
2) Ignition "ON" & Engine "OFF".
3) After connecting Scantool and monitor the "TCC SOLENOID VALVE DUTY" parameter on the Scantool data list.
4) Select 1st gear and accelerate engine speed to 2500 rpm.
5) Measure oil pressure.
Specification: approximately 235-274Kpa(2.4-2.8kg/cm2) @ (in condition that TCC SOL. DUTY 0%)
6) Is oil pressure value within specification?
YES
^ Repair TORQUE CONVERTER CLUTCH(REPLACE Torque Converter) as necessary and go to "Verification of vehicle repair" procedure.

NO
^ Replace A/T assembly (possible to BODY CONTROL VALVE faulty) as necessary and go to "Verification of vehicle repair" procedure.

VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0741. P0741