Idle Speed Motor Position Sensor: Description and Operation

Idle Switch / Motor Position Sensor Locations:

DESCRIPTION
The Motor Position Sensor (MPS) is a variable resistor type sensor. The MPS uses a plunger (contact) that is connected to the ISC servo and a set of electrical windings that are stationary.

LOCATION
The MPS is located on the Idle Air Control (IAC) servo.

OPERATION
As the servo moves, so does the plunger, changing the output voltage of the sensor. The ECU uses this signal to determine the position of the ISC servo.