•For GM vehicles with throttle body or port fuel injection systems, checks the electronic control module signal that provides direction to idle air control motor.
•113-3501: IAC test light for GM 1982 and newer GM TBI  and PFI fuel injection system with square 4-pin connector.
•113-3502: IAC test light for GM 1987 and newer GM model 700 TBI and PFI fuel injection systems with flat 4-pin connector.
 

•For GM vehicles with throttle body or port fuel injection systems, checks the electronic control module signal that provides direction to idle air control motor.
•113-3501: IAC test light for GM 1982 and newer GM TBI  and PFI fuel injection system with square 4-pin connector.
•113-3502: IAC test light for GM 1987 and newer GM model 700 TBI and PFI fuel injection systems with flat 4-pin connector.