P0742

DTC P0742 TORQUE CONVERTER CLUTCH CIRCUIT - STUCK ON

GENERAL DESCRIPTION
Refer to DTC P0741. P0741

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

DTC DETECTING CONDITION





MONITOR SCANTOOL DATA
1. Connect scan tool 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 scan tool.





5. Is TCC SLIP" within specifications?

YES

> Fault is intermittent caused by poor contact in the sensor's and/or TCM (PCM)'s connector or was repaired and TCM (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 scan tool to data link connector (DLC).
2) Ignition "ON" & Engine "OFF".
3) Select A/T solenoid valve actuator test and operate actuator test.
4) Is Actuator Testing performed normally?





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 scan tool and monitor the "TCC SOLENOID VALVE DUTY" parameter on the scan tool data list.
4) Select 1st gear and accelerate Engine speed to 2500 rpm.
5) Measure oil pressure.

Specification: approx. Above 5.1-7.1 kg/cm2 (500-696 kpa, 72.5-100.99 psi)

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