Enables ECU signal faults to be located and isolated. Simply disconnect harness and plug in the test light. Noid Lite: GM TBI / SCPI / PFI / Multec 2 / Bosch / PFI, Ford TBI, Geo TBI
IAC Lite: GM 700 TBI FBI with flat or square 4 pin 1.3 fibre optic cable to view light from the drivers seat.