Capable of diagnosing signal issues in 1987 and newer GM Model 700 TBI and PFI fuel injection systems, this IAC signal test light provides visual confirmation of electronic control module output. It connects to the system via a flat 4-pin connector to check the idle air control circuit for proper operation. This 2-ounce (56.7 g) light serves as a dedicated diagnostic tool for identifying electrical faults within the fuel injection harness.

Capable of diagnosing signal issues in 1987 and newer GM Model 700 TBI and PFI fuel injection systems, this IAC signal test light provides visual confirmation of electronic control module output. It connects to the system via a flat 4-pin connector to check the idle air control circuit for proper operation. This 2-ounce (56.7 g) light serves as a dedicated diagnostic tool for identifying electrical faults within the fuel injection harness.