E40D

Transmission Control Switch (TCS)/Transmission Control Indicator Lamp (TCIL)










Description

The Transmission Control Switch (TCS) is a momentary contact switch. When the switch is pressed, a signal is sent to the PCM. The PCM then energizes the Transmission Control Indicator Lamp and the Coast Clutch Solenoid (CCS), applying the coast clutch provide engine braking and cancels fourth gear operation.

Note: TCIL will also flash if the EPC circuit is shorted.

Sensor: Transmission Control Switch (TCS)

Transmission Function-Disable fourth gear operation.

Symptoms-No overdrive cancel when switch is cycled.

Diagnostic Trouble Codes-65 (two digit), 632 (three digit), tested during Key On Engine Off (KOEO) On-Board Diagnostic only. Refer to Manufacturer Code Charts

Actuator: Transmission Control Indicator Lamp (TCIL)

Transmission Function-Indicates overdrive to cancel mode activated (lamp on) and EPC circuit shorted (lamp flashing).

Symptoms-Failed on-overdrive cancel mode always indicated, no flashing for EPC circuit shorted. Failed off-overdrive cancel mode never indicated, no flashing for EPC circuit shorted.

Diagnostic Trouble Codes-97 (two digit), 631 (three digit). Refer to Manufacturer Code Charts