Idle Speed Motor Position Sensor: Testing and Inspection

Idle Switch / Motor Position Sensor Locations:

To test the Motor Position Sensor, attached to the Idle Speed Control (ISC) servo (mounted on the throttle body), proceed as follows.

Motor Position Sensor, Connector Location:

Motor Position Sensor Test Hook-ups:

1. Connect an ohmmeter between terminals 1 and 4 of the motor position sensor connector.
Terminal 1: Sensor power
Terminal 4: Sensor ground

2. Measure the resistance of the terminals.
Standard Value...4-6 Kohm
3. Attach an ohmmeter between terminals 2 and 4 of the motor position sensor connector.
Terminal 2: MPS output
Terminal 4: Sensor ground

ISC Connector Hook-up:

4. Connect a 6V battery between terminals 1 and 2 of the ISC motor connector (to operate the ISC motor) and check to see that resistance of the MPS (step #3 hook-up) changes smoothly when the ISC motor is activated.

5. If the standard value is not achieved, or if the change is not smooth, replace the ISC servo assembly.