F 150 2WD Lightning V8-5.4L SOHC SC VIN 3 (2001)
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Transmission Mode Indicator - A/T: Description and Operation
TRANSMISSION CONTROL INDICATOR LAMP
The Transmission Control Indicator Lamp (TCIL) is an output signal from the PCM that controls the lamp on/off function depending on the
engagement or disengagement of overdrive. Refer to Transmission Control Switch, PCM Inputs.