Secondary (For Traction Control System, TCS)

Secondary Throttle Position Sensor:

PURPOSE
To provide the Traction Control Module (TCM) with a voltage signal that corresponds to the opening angle of the throttle control motor. In addition, the sensor detects the opening and closing speed and position of the secondary throttle valve and feeds the voltage signal the the TCM.

OPERATION
The secondary throttle position sensor responds to the movement of the throttle motor which is controlled by the TCM.
When the secondary throttle valve opening becomes smaller than the ordinary throttle valve opening due to Traction Control System operation, only then, the signal from the secondary throttle valve is used for engine control in place of the signal from the ordinary throttle position sensor. The signal of the secondary throttle valve first enters the TCM, from where it is sent to the ECCS Control Module.