Transmission Control Module (TCM) Inputs/Outputs

TCM INPUTS
Input Speed Sensor (Torque Converter Turbine)
The input speed sensor provides the Transmission Control Module (TCM) with transmission input shaft speed information. This signal is produced from an inductive pick-up, generating 30 pulses per revolution.

Transmission Output Speed Sensor
The output speed sensor provides the TCM with transmission output shaft speed information. This signal is produced from an inductive pick-up, generating 36 pulses per revolution.

Transmission Oil Temperature Sensor
Provides an electrical indication of the oil temperature to the TCM. The temperature is measured using a negative temperature coefficient thermistor. The signal is measured as a voltage with reference to analogue ground in the TCM.

Kickdown Switch
Kickdown is intended to provide maximum vehicle acceleration, via the appropriate downshift(s), when the driver uses full throttle. A kickdown switch provides an electrical signal to the TCM when the accelerator pedal is fully pressed. The switch is normally open, connected to vehicle ground. Should the switch fail the TCM will detect kickdown using the accelerator pedal position.

Mode Selection Switch
The mode selection switch is a two position switch indicating to the TCM the current performance mode selected by the driver. The switch generates a two-bit digital input to the TCM.

Rotary Position Switch
The rotary position switch detects the position of the transmission selector shaft. The switch is supplied as part of the transmission assembly, mounted on the transmission body. The switch is used to detect seven shaft positions: Park, Reverse, Neutral, Drive, Third, Second and First, the switch provides a four-bit input to the TCM.

Drive to Fourth Switch
Detects the movement of the selector lever from Drive to Fourth position. The selector cable, and therefore the transmission selector shaft, does not move as the lever is operated between these two positions. The switch is located within the 'J-gate' assembly, producing a digital output.