Transmission Control Switch (TCS)

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

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

When the driver initially 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 cancelled.

When the TCS  is pressed again, 5th (D) gear operation is enabled, the coast clutch is released and the TCIL  is turned OFF.

Whenever the ignition is cycled (vehicle shut off, then started again), the TCS  is turned OFF and 5th gear will be enabled, even if the TCS  had been on when the ignition was shut off.