Transmission Control Switch (TCS)

Transmission Electronic Control System

Transmission Control Switch (TCS)

The Transmission Control Switch (TCS) is a momentary contact switch that allows the driver to cancel operation of 5th gear.

The TCS is located on the end of the selector lever.

When the driver presses the TCS a signal is sent to the PCM.

The PCM uses the shift solenoids to disengage/disable 5th gear operation and activate the coast clutch.

At the same time, the PCM illuminates the Transmission Control Indicator Lamp (TCIL) to notify the driver that 5th gear is canceled.

When the TCS is pressed again, 5th gear operation is enabled, the coast clutch is released and the TCIL is turned off.

Whenever the ignition is cycled, the TCS is turned off and 5th gear will be enabled, even if the TCS had been on when the ignition was cycled off.