Idle Speed Controller Test

Fig. 17 Checking idle speed controller & wiring:

TEST 1, INSPECTION

1. Check wiring and the controller for damage or deterioration, Fig. 17.
2. If no repairs are required, proceed to TEST 2.
3. If repairs are required, make necessary repairs, then check controller for proper operation.



TEST 2, POWER FEED TO ACTUATOR CHECK

1. Connect test light between red wire and clean underbody ground, then turn ignition switch to RUN position and observe test light.
2. If light illuminates, proceed to TEST 3.
3. If light does not illuminate, repair open in power feed circuit, then verify proper controller operation.

TEST 3, CONTROLLER OPERATIONAL CHECK

1. Connect jumper wire from actuator gray wire to clean underbody ground, then turn ignition switch to RUN position and listen for controller operation.
2. If controller operates, proceed to TEST 4.
3. If controller does not operate, replace idle speed controller, then verify operation of new controller.

TEST 4, CONTROL CIRCUIT CHECK

1. Using ohmmeter, check for continuity between wire at ECA pin 21 and gray wire at controller.
2. If there is continuity, problem is not in controller.