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
A thermistor which provides an electrical indication of the oil temperature to the TCM. The signal is measured as a voltage with reference to analog ground in the TCM.

Kickdown Switch (where fitted)
Kickdown is intended to provide maximum vehicle acceleration, via the appropriate downshift(s), when the operator 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.

Throttle Pedal Stop (where fitted)
This component, used where the kickdown switch is not fitted, limits throttle pedal travel in the same way. The kickdown feature is retained, but is controlled by throttle position only. The pedal stop must be set, using the PDU (Portable Diagnostic Unit), in the same way as the kickdown switch to optimize performance.

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 a new transmission assembly, mounted on the transmission body. The switch is used to indicate to the TCM the six positions of the shaft: Park, Reverse, Neutral, Drive, Third and Second. 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 to indicate to the TCM that the lever has moved from D to 4.