Normal Operation

Normal Operation of 4L30-E Transmission
Torque Converter Clutch (TCC) Application Conditions: 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).
- The brake pedal is released.
- 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 (V6)
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 (V6)
With the selector lever in reverse position, the PCM will not close the PWM solenoid until the vehicle is below 15 km/h (9.3 mph), thus preventing reverse engagement above this speed.