AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT)(D) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR STUCK OFF

DTC DETECTING CONDITION:

• Lock up clutch malfunction

• Sticky valve

TROUBLE SYMPTOM:

No lock-up occurs.

STEPCHECKYESNO

1.CHECK LOCK-UP DUTY SOLENOID CIRCUIT.

Diagnose according to DTC P0743 procedure.

Is there any trouble?

Repair or replace the lock up duty solenoid circuit.

2.CHECK INHIBITOR SWITCH CIRCUIT.

Diagnose according to DTC P0705 procedure.

Is there any trouble?

Repair or replace the inhibitor switch circuit.

3.CHECK STOP LIGHT SWITCH CIRCUIT.

Diagnose according to DTC P0719 and P0724 procedures.

Is there any trouble?

Repair or replace the stop light switch circuit.

4.CHECK ATF TEMPERATURE SENSOR CIRCUIT.

Diagnose according to DTC P0712 AND P0713 procedure.

Is there any trouble?

Repair or replace the ATF temperature sensor circuit.

5.CHECK ACCELERATOR PEDAL POSITION SENSOR.

1) Connect the Subaru Select Monitor to the data link connector.

2) Turn the ignition switch to ON.

3) Read the value of Accel. opening angle on Subaru Select Monitor display.

Does the value of Accel. opening angle change from 0% to 100% smoothly when accelelator is operated from fully closed to fully open?

Check the accelerator pedal position sensor circuit.

6.CHECK TORQUE CONVERTER TURBINE SPEED SENSOR.

1) Move the select lever to “P” or “N” range.

2) Idle the engine.

Does the value of turbine speed displayed by Subaru Select Monitor almost correspond with the value of the tachometer?

Check the torque converter turbine speed sensor circuit.

7.CHECK ENGINE SPEED SIGNAL.

Idle the engine.

Does the value of engine speed displayed by Subaru Select Monitor almost correspond with the value of the tachometer?

There are malfunctions in TCM, TCM connector poor contact, or transmission assembly mechanical malfunction.

Check the engine speed signal circuit.