1. The most economic way to check electronic fuel
injection (EFI) signals
2. Fast and easily checks for systems of GM TBI,
Bosch PFI Ford TBI, GM PFI, Geo TBI and
GM SCPI just disconnect the fuel injector, plug
the Noid Lite into injector, Plug the Noid Lite
into injector wiring harness then crank the engine.
IAC Signal Test Lights
Use testers for checking the electronic control module
signal that provides direction to the idle air-control
motor on GM vehicles with throttle body or port fuel
injection systems.