Idle Speed Motor Position Sensor: Testing and Inspection

1. Turn ignition switch to Lock, then disconnect ISC motor connector.
2. Turn ignition switch On, then apply approximately 6 volts (DC) or lower between terminals 1 and 2 of ISC motor connector, and then measure the resistance between terminals 1 and 2 of the motor position sensor connector when the idle-speed control servo is activated (caused to expand and contract).
3. Ensure MPS output voltage changes smoothly, during ISC motor operation, between .5 and 5 volts.
4. If there is a deviation from the standard value, or it doesn't change smoothly, replace the idle-speed control servo assembly.