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.
The PCM/TCM checks the Damper Clutch Control Signal by monitoring the feedback signal from the solenoid valve drive circuit.
Item | Detecting Condition & Fail Safe | Possible cause |
DTC Strategy | ● Check voltage range | ※ TORQUE CONVERTER(DAMPER) CLUTCH : TCC ● Open or short in circuit ● Faulty TCC SOLENOID VALVE ● Faulty PCM/TCM |
Enable Conditions | ● Solenoid status Either solid On or OFF ● Voltage of Battery ＞10V | |
Threshold value | ● Voltage ＜3V | |
Diagnostic Time | ● more than 320 ms | |
Fail Safe | ● Locked in 3 rd gear.(Control relay off) |
Connect scantool to data link connector(DLC)
Engine "ON".
Monitor the "TCC SOL. VALVE" parameter on the scantool
Sellect "D RANGE" and Operate "TCC SOLENOID DUTY" more than 85%
Does "TCC SOLENOID DUTY " follow the referance data?
▶ 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 "W/Harness Inspection " procedure
Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure
▶ Go to "Power Circuit Inspection" procedure
Disconnect "A/T SOLENOID VALVE" connector.
Measure voltage between teminal"10" of the sensor harness connector and chassis ground.
Turn ignition switch OFF → ON
Specification: 12V is measured only for approx. 0.5sec
Is voltage within specifications?
▶ Go to "Signal circuit inspection" procedure
▶ Check that A/T-20A Fuse in engine room junction is installed or not blown.
▶ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
Check signal circuit open inspection
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector
Measure resistance between terminal "7" of the ATM SOLENOID VALVE harness connector and terminal "15" of the TCM harness connector
Specification: approx. 0 Ω
Is resistance within specifications?
▶ Go to "Check signal circuit short Inspection" procedure
▶ Check for open in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
Check signal circuit short inspection
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector and "PCM/TCM" connector
Measure resistance between terminal "7" of the ATM SOLENOID VALVE harness and chassis ground.
Specification: Infinite
Is resistance within specifications?
▶ Go to "Component Inspection" procedure
▶ Check for short to ground in harness. Repair as necessary and Go to "Verification Vehicle Repair" procedure
CHECK SOLENOID VELVE
Ignition "OFF".
Disconnect "A/T SOLENOID VALVE" connector
Measure resistance between terminal "7" and terminal "10" of the ATM SOLENOID VALVE harness connector
Specification: Approximately 2.7~3.4 Ω (20°C)
Is resistance within specification?
▶ Go to "CHECK PCM/TCM" as below
▶ Replace TCC SOLENOID VALVE as necessary and go to "Verification Vehicle Repair" procedure
CHECK PCM/TCM
Connect scantool to data link connector(DLC)
Ignition "ON" & Engine "OFF".
Select A/T Solenoide valve Actuator test and Operate Actuator test.
Can you hear operating sound for TCC SOLENOID VALVE Actuator Testing Function ?
▶ Go to "Verification Vehicle Repair" procedure
▶ Replace PCM/TCM as necessary and Go to "Verificaiton Vehicle Repair" procedure
ACTUATOR TEST CONDITION
IG SWITCH ON
TRANSAXLE RANGE SWITCH is normal
P RANGE
Vehicle Speed 0km/h
Throttle position sensor＜ 1V
IDLE SWITCH ON
ENGINE RPM 0
Refer to DTC P0741
Solenoid Valve for Pressure Control
● Sensor type : Normal open 3-way
● Operating temperature : -22~266°F(-30°C∼130°C)
● Frequency :
- LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20°C above)
- DCC : 30.64Hz
※ KM series : 35Hz
● Internal resistance : 2.7~3.4Ω(68°F or 20°C)
● Surge voltage : 56 V
