Idle Speed Actuator

Idle Speed Control (ISC) Servo Circuit:

Idle Speed Control (ISC) Servo Location:

To test the Idle Speed Control (ISC) Servo, located on the throttle body, proceed as follows.
1. Disconnect the ISC motor connector.

Idle Speed Control (ISC) Servo Test:

2. Check the continuity of the ISC motor coil between terminals 1 and 2.

Standard Value...5-35 ohm (@20°C/68°F)

Idle Speed Control (ISC) Servo Test:

3. Connect 6V DC (four dry cells) between terminal 1 and terminal 2 of the ISC motor connector, and check to be sure that the ISC servo operates.
4. Connect 6V DC (four dry cells) in reverse polarity than in step 3, between terminal 1 and terminal 2 of the ISC motor connector and check to be sure that the ISC servo operates.
CAUTION: Apply only a 6V DC or lower voltage. Application of higher voltage could cause locking of the servo gears.

4. If the servo does not operate, replace it as an assembly.