The GM-47976 AFIT (Active Fuel Injector Tester) is a previously essential tool that can quickly and thoroughly diagnose and pinpoint the source of a vehicle's drivability issue, avoiding unnecessary replacement of fuel system components, especially injectors that are not the actual cause of the problem. GM-47976-515 is a universal cable designed to eliminate the need for new cables when ECM controller connector changes or changes in connector pin locations occur in new vehicles. One end of the GM-47976-515 Universal Cable plugs into the AFIT SIDI DMU. The DMU plugs into the AFIT MCU (Main Control Unit).
Any new Cable Adapters required will plug into the other end of the Universal Cable. The GM-47976-516 G7 Adapter and GM-47976-517 G8 Adapter are the first adapters to be used with the GM-47976-515 Universal Cable for engine diagnostics, utilizing the GM-47976 AFIT, due to 2019 vehicle controller changes.