Idle Switch (Inside ISC Actuator)

Turn ignition off. Using a voltmeter, backprobe between ground and PCM harness connector "B", terminal No. 4. Turn ignition on. With throttle lever in contact with ISC plunger, reading should be 0-1 volt. With throttle lever away from ISC plunger, reading should be 4-6 volts. If either voltage reading is not within specification, replace lower throttle body.