The 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 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 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 TCM judges that DCCSV circuit is malfunctioning and sets this code.
Item | Detecting Condition & Limp Home | Possible Cause |
DTC Strategy | ● Circuit continuity-open,ground | ● Open or short circuit ● Defective DCC SOLENOID VALVE ● Defective TCM |
Enable Conditions | ● Shift status in-gear Voltage of Battery >10V | |
Threshold Value | ● Voltage <3V | |
Diagnostic Time | ● More than 320 ms | |
Fail Safe | ● Locked in 3 rd gear.(control relay off) |
Solenoid Valve for Pressure Control
Sensor type : Normal open 3-way
Operating temperature : -30℃∼130℃
Frequency : LR, 2ND, UD, OD, RED : 61.27Hz (at the ATF temp. -20℃ above)
DCC : 30.64Hz
KM series : 35Hz
Internal resistance : 3.0Ω(20℃)
Surge voltage : 56 V
