GENERAL DESCRIPTION

The PCM/TCM controls the locking and unlocking of the Torque Converter Clutch ( or Damper Clutch ), to the input shaft of the transmission, by appling hydraulic pressure. The main purpose of T/C clutch control is to save fuel by decreasing the hydraulic load.

DTC DESCRIPTION

The PCM/TCM increases the duty ratio to engage the Damper Clutch by monitoring slip rpms (difference vlaue beteween engine speed and turbine speed ). To decrease the slip of the Damper Clutch, the PCM/TCM increases the duty ratio by appling more hyraulic load.

DTC DETECTING CONDITION

Item

Detecting Condition & Fail Safe

Possible cause

DTC Strategy

● Stuck "OFF"

※ TORQUE CONVERTER(DAMPER) CLUTCH : TCC

● Faulty TCC or oil pressure system

● Faulty TCC solenoid valve

● Faulty bady control valve

● Faulty PCM/TCM

Enable Conditions

● A/T range switch D,SP(sports mode)

● Solenoid valve stetus is 100% duty

Threshold value

●Calculated slip (engine speed-input speed)

＞ 160rpm(need to verify Threshold value)

Diagnostic Time

● more than 4sec

Fail Safe

●Damper clutch abnormal system

(If diagnosis code P0741 is output four times, TORQUE CONVERTER(DEMPER) CLUTCH is not controlled by PCM/TCM)

MONITOR SCANTOOL DATA
1.

Connect scantool to data link connector(DLC)

2.

Engine "ON".

3.

Sellect "D RANGE" and drive vehicle

4.

Monitor the "TORQUE CONVERTER(DAMPER) CLUTCH" parameter on the scantool

Specification : TCC SLIP＜160RPM(In condition that TCC SOL. DUTY ＞ 80% )

Are "TCC SOLENOID DUTY and TCC SLIP" within specifications ?

▶ 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. Throughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or

▶ 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 Solenoide valve Actuator test and Operate Actuator test.

Can you hear operating tone for using TCC SOLENOID VALVE Actuator Testing Function ?

▶ Go to "CHECK OIL PRESSURE" as below.

▶ Replace "TCC SOLENOID VALVE" as necessary and Go to "Verification Vehicle Repair" procedure

2.

CHECK OIL PRESSURE

(1)

Connect Oil pressure guage to "DA" port.

(2)

Engine "ON".

(3)

After connecting Scantool and monitor the "TCC SOLENIOD VALVE DUTY" parameter on the Scantool data list.

(4)

Operate vehicle with 3rd or 4th gear and operate the "TCC SOLENIOD VALVE DUTY" more than 85%.

Specification : Oil pressure guage approx 735.4960KPa(7.5kg/cm²)-(In condition that TCC SOL. DUTY ＞ 85%)

Is oil pressure value within specification?

▶ Repair TORQUE CONVERTER CLUTCH(REPLACE Torque Converter ) as necessary and Go to "Verification Vehicle Repair " procedure.

▶ Replace A/T ass'y (possible to BODY CONTROL VALVE faulty) as necessary and Go to "Verification Vehicle Repair " procedure.

VERIFICATION OF VEHICLE REPAIR

After a repair, it is essential to verify that the fault has been corrected.

1.

Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.

2.

Using a scantool, Clear DTC.

3.

Operate the vehicle within DTC Enable conditions in General information.

Are any DTCs present ?

▶ Go to the applicable troubleshooting procedure.

▶ System performing to specification at this time.

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