The PCM/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 inside the T/C. The PCM/PCM/TCM outputs duty pulses to control the Damper Clutch Control Solenoid Valve( DCCSV ) and hydraulic pressure is applied to the DC according to the DCC duty ratio value. When the duty ratio is high, high pressure is applied and the Damper Clutch is locked. The normal operating range of the Damper Clutch Control duty ratio value is from 30%(unlocked) to 85%(locked).
The PCM/PCM/TCM checks the Damper Clutch Control Signal by monitoring the feedback signal from the solenoid valve drive circuit. If an unexpected signal is monitored (for example, high voltage is detected when low voltage is expected, or low voltage is detected when high voltage is expected) the PCM/PCM/TCM judges that DCCSV circuit is malfunctioning and sets this code.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Check voltage range | ● Open or short in circuit ● Faulty DCC SOLENOID VALVE ● Faulty PCM/TCM |
Enable Conditions | ● 16V > Voltage Battery >10V ● In gear state(no gear shifting) 500msec is passed from turn on the relay ● A/T Relay = ON ● Engine state = RUN | |
Threshold Value | ● Feedback voltage from DCC control solenoide>vb-2V and DCC control duty is 100% ● Feedback voltage from DCC control solenoide≤5.5V and DCC control duty is 0% | |
Diagnostic Time | ● More than 5seconds | |
Fail Safe | ● Locked in 3 rd gear.(Control relay off) |
Solenoid Valve for Pressure Control
- Sensor type : Normal open 3-way
- Operating temperature : -22~266℉(-30℃∼130℃)
- Frequency : LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20℃ above)
DCC : 30.64Hz
※ KM series : 35Hz
- Internal resistance : 2.7~3.4Ω(68℉ or 20℃)
- Surge voltage : 56 V
