Circuit Description

Torque Converter Clutch (TCC) solenoid is a Pulse Width Modulated (PWM) solenoid. When vehicle operating conditions are appropriate to apply TCC, PCM begins TCC PWM duty cycle at about 42 percent. PCM then increases duty cycle up to 90 percent to achieve full TCC apply pressure.

When TCC PWM is de-energized, solenoid blocks filtered 2-3 drive fluid and allows TCC signal fluid to exhaust. When energized, solenoid modulates fluid into TCC signal fluid circuit. When fully energized, modulation stops and solenoid blocks both 2-3 drive fluid and TCC signal fluid from being exhausted. DTC P0741 will set when PCM detects a high TCC slip speed when TCC is commanded on.