Normal Operation

Normal Operation Of 2002 4L30-E Transmission
Torque Converter Clutch (Electronically Controlled Capacity Clutch: ECCC) Application Conditions:
The clutch apply is controlled by moving the converter clutch control valve by commanding Torque Converter Clutch (TCC) solenoid using the PWM signal.
The TCC is normally applied in 2nd, 3rd and 4th gears only when all of the following conditions exist:
The engine coolant temperature is above 70°C (158°F) and ATF temperature is above 18°C (64.5°F).
The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th gears when the transmission oil temperature is above 135°C (275°F).
This mode should be canceled at 125°C (257°F).

ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing) if the transmission oil temperature is above 145°C (293°F).
The ATF warning lamp goes off again when the transmission oil temperature is below 125°C (257°F).

Reverse Lock Out
With the selector lever in reverse position, the PCM will not close the PWM solenoid until the vehicle is below 11 km/h (6.8 mph), thus preventing reverse engagement above this speed.