1998 Navigator 4WD V8-54L SOHC VIN L: Overdrive Indicator Lamp Info
Overdrive Indicator Lamp: Description and Operation
TRANSMISSION CONTROL SWITCH (TCS) AND TRANSMISSION CONTROL INDICATOR LAMP (TCIL)
The Transmission Control Switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the powertrain control module
to allow automatic shifts from first through fourth gears or first through third gears only. The powertrain control module energizes the Transmission
Control Indicator Lamp (TCIL) when the switch is off. The TCIL indicates overdrive cancel mode activated (lamp on) and Electronic Pressure
Control (EPC) circuit shorted (lamp flashing) or monitored sensor failure.
