Idle Speed Control (ISC) Motor

With air cleaner removed, air conditioner off (if equipped) and engine at normal operating temperature, connect a tachometer to terminals 1 (+) and 3 (-) of the small diagnostic connector (D1). See Fig 1 . Turn ignition off and observe ISC motor plunger. The plunger should move to fully extended position.
With ISC motor fully extended, disconnect wire connector and start engine. Idle speed should be 3300-3700 RPM. If not, turn adjusting nut on plunger until correct idle speed is obtained. See Fig 2 .
Hold closed throttle switch plunger all the way in while opening throttle. Release the throttle. Throttle lever should not make contact with the plunger. If contact is made, inspect throttle linkage and/or cable for binding or damage. Repair as needed.
Reconnect ISC motor wire connector and turn ignition off for 10 seconds. Motor should move to fully extended position. Start engine. Engine should idle at 3300-3700 RPM for a short time and then fall to normal idle. Turn off engine and remove tachometer.

Fig 1: Diagnostic Connector Location With Terminal Identification Diagnostic connectors and relays are mounted on a common bracket, just in front of right shock tower.
When final adjustments have been made, apply thread sealer to adjustment screw threads to prevent movement. Install air cleaner. Since step 3) may set a trouble code, remove negative battery cable for 10 seconds to clear ECU memory.

Fig 2: Idle Speed Control & WOT Switch Adjustment Use a throttle angle gauge to set WOT switch at 15 Degrees before wide open throttle.