Automatic Transmission/Transaxle: Description and Operation

RANGE REFERENCE CHART

NORMAL OPERATION OF 1998 4L30-E TRANSMISSION
TORQUE CONVERTER CLUTCH (TCC) APPLICATION CONDITIONS:
Engine coolant temperature must be above 70°C (158°F). Moreover, TCC is on in 2nd gear during kick down operation when engine coolant temperature is above 70°C (158°F). Also, TCC is always on in 2nd, 3rd & 4th gear when 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 140°C (284°F). The ATF warning lamp goes off again when the transmission oil temperature is below 120°C (248°F).

SPECIAL SHIFT PATTERN WHEN THE ENGINE IS COLD:
A special shift pattern is activated when the engine coolant temperature is below 70°C (158°F). (3-4 shifts, for example, are delayed for small throttle openings and will occur a few MPH higher.)