Idle Speed Control Motor (DC Motor)

Operation

The volume of Intake air during idling Is regulated by the opening and closing of the throttle valve, caused by expansion and contraction of the servo plunger.

The servo plunger expands or contracts In accordance with whether the DC motor (located within the idle speed control motor) is driven in the forward or reverse direction.

The DC motor is driven in either the forward or reverse direction according to the direction of switching of the current flow of the motoractivation IC within the engine control module.

Troubleshooting Hints

If there is unstable idling or engine stalling, etc., and it is difficult to presume the cause of the problem, switch ON the ignition switch and leave as is for 15 seconds or longer; then disconnect the servo connector.

The cause of the problem can then be easily presumed by checking in this condition. Note that, if necessary, the engine speed adjusting screw should be turned to adjust the engine rpm.





Harness Inspection



Actuator Inspection

(1) Disconnect the idle speed control motor connector.
(2) Check continuity of the idle speed control motor coil.









(3) Connect 6V DC between terminal 1 and terminal 2 of the idle speed control motor connector, and check to be sure that the idle speed control motor operates.

Caution: Apply only a 6V DC or lower voltage. Application of higher voltage could cause locking of the servo gears.

(4) If not, replace idle speed control motor as an assembly.