Century L4-2.2L VIN 4 (1994)
Torque Converter Clutch Solenoid: Description and Operation
Torque Converter Clutch (TCC) Solenoid Circuit
Quad-Driver Module (QDM 1) Circuit
PURPOSE:
The Transmission Converter Clutch (TCC) feature eliminates the power loss of the torque converter stage when the vehicle is in a cruise mode.
OPERATION:
The TCC system uses a solenoid operated valve in the automatic transmission to couple the engine flexplate to the output shaft of the transaxle
through the torque converter. This reduces the slippage losses in the converter, which increases fuel economy. For the converter clutch to apply, at
least two conditions must be met.
1.
Internal transmission fluid pressure must be correct.
2.
The PCM completes a ground circuit to energize the TCC solenoid in the transmission, which moves a check ball in the fluid line.
PCM control is based on the input of three sensors:
^
Vehicle Speed Sensor (VSS): Speed above EPROM calibrated value above 35 mph with A/C "OFF", or 44 mph with A/C "ON".
^
Coolant Temperature Sensor (CTS): Engine above 20°C (68°F)
^
Throttle Position Sensor (TPS): Not changing indicating steady road speed
PCM is also controlled by two switches:
^
Brake Switch: Closed
^
Third Gear Switch : Applied
LOCATION:
Transaxle.
