Idle-Up Control System

With engine idling under hot conditions, apply each load as specified in IDLE-UP SOLENOID VALVE TESTING table and confirm operation of correct idle-up solenoid valve (s).

IDLE-UP SOLENOID VALVE TESTING

Component	Condition	Valve(s)
Air Conditioner	On	A & B
Headlights	On	A
Heater Switch	On	A
Power Steering	Turned	A
Rear Defroster	On	A

If correct solenoid valve (s) is not energized, check the operation of each solenoid valve. Do this by applying battery voltage to solenoid valve harness connector while listening for a clicking actuation sound of valve. See Fig 1 . If no actuation of valve is taking place, check harness connector, harness and switch of malfunctioning valve before replacing solenoid valve.

Fig 1: Testing Solenoid Valves

Fig 2: Diagnostic Charts (Improper Idling)

Fig 3: Diagnostic Charts (Engine Startability)

Fig 4: Diagnostic Charts (Engine Stall)