New AFIT Adapters Released for 2019MY Engines

The Active Fuel Injector Tester (AFIT) Spark Ignited Direct Injection (SIDI) Diagnostic Kit, essential tool CH-47976, was released several years ago for port and direct injected engine applications (Fig. 7) to help reduce misdiagnosis of fuel systems. The AFIT can aid in diagnosis to pinpoint the source of a vehicle drivability issue and avoid unnecessary replacement of fuel system components, especially fuel injectors that are not the cause of the condition.


Fig. 7


TIP: The AFIT Kit, CH-47976, was an essential tool for Tier 1, 2, 3, and 4 dealerships only. Tier 5 dealerships may order the tool at

The AFIT uses a microprocessor and software program to completely automate the fuel injection test procedure, eliminating the possibility of math errors and omitted calculations. Complete test results, including balance percentages and flow rates, are displayed on the Main Control Unit (MCU) and can be downloaded to a PC for printing and attaching to the repair order.

The AFIT tests include:

  • Injector Test – tests the fuel injector flow characteristics
  • Pressure Test – tests the fuel system pressure
  • Leak Down Test – pressurizes the fuel system and allows a leak down test to the vehicle’s specifications

The CH-47976-500A kit included a Drive/Measurement Unit (DMU) along with several adapters and cables to connect to a variety of GM engines. Since the release of the CH-47976-500A kit, a number of other adapters also have been made available. (Fig. 8)


Fig. 8


To help in determining which adapter to use, the AFIT will display the correct adapter during the testing process. The latest software must be used in order to display all correct adapter and cable selections. Download the latest AFIT software through the Service Workbench selection of “Essential Tools – Software Updates” in GM GlobalConnect (U.S. only). In Canada, the software is available for download through the Service Application selection of GM Special Tools & Equipment – Software Updates in GM GlobalConnect.

With pinout location changes on new Engine Control Modules (ECM), a number of new adapters and a universal cable have been released for several new GM models, including the 2019 Silverado 1500, Sierra 1500, and XT4.


CH-47976-515 – Universal AFIT Cable

Applications: 5.3L V8 (RPO L82, L84), 6.2L V8 (RPO L87), 4.3L V6 (RPO LV3), 2.0L I4 (RPO LSY), 4.2L V8 (RPO LTA)

CH-47976-515 (Fig. 9) is a universal cable designed to avoid the need for new cables when ECM connector changes or connector pin location changes occur in new vehicles. One end of the cable plugs in to the appropriate adapter and the other end to the AFIT SIDI DMU. The DMU plugs into the AFIT MCU and links the entire AFIT system together for injector flow testing and fuel pump pressure and regulator testing


Fig. 9


CH-47976-516 – G7 AFIT Adapter

Applications: 5.3L V8 (RPO L82, L84) with ECM E90, 6.2L V8 (RPO L87) with ECM E90, 4.3L V6 (RPO LV3) with ECM E93

The CH-47976-516 G7 Adapter (Fig. 10) is one of the first adapters used with the CH-47976-515 Universal Cable for engine diagnostics using the CH-47976 AFIT. It’s used on the 2019 Silverado 1500 and Sierra 1500 with the E90 and E93 controllers.


Fig. 10


CH-47976-517 – AFIT G8 Adapter

Application: 2.0L I4 (RPO LSY) with ECM E01

The CH-47976-517 G8 Adapter (Fig. 11) is used with the CH-47976-515 Universal Cable for engine diagnostics using the CH-47976 AFIT on the 2019 XT4 with the E01 controller.


Fig. 11


CH-47976-518 – G9 AFIT Adapter

Application: 4.2L V8 (RPO LTA) with ECM E68

The CH-47976-518 G9 Adapter (Fig. 12) is used with the CH-47976-515 Universal AFIT DMU Cable to allow injector and fuel system diagnosis with the CH-47976 AFIT on the 2019 CT6 with the E68 controller.


Fig. 12


Vehicle Application Chart

An updated 1996-2020 AFIT Vehicle Application Chart has been released to help identify cable adapters for each GM model. The chart lists the model applications, engine RPO, cable components, type of communication, SENT (Single Edge Nibble Transmission) applications and Stop/Start applications.


– Thanks to Rick Jackson and Todd Hayes


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