Diagnostic Instructions
Circuit/System Description
The
CH-47976
Active Fuel Injector Tester (AFIT) is used to test the fuel pump, fuel system leak down, and the fuel injectors. The on screen prompts or selections will indicate the steps required to
perform each of the available tests. The tester will perform all of the tests automatically and display results of the test. The results can also be down loaded for storage and printing. Refer to the User Guide, CH 47976-11 for more information.
Diagnostic Aids
• | Monitoring the misfire current counters, or misfire graph, may help to isolate the fuel injector that is causing the condition. |
• | Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition. |
Reference Information
Schematic Reference
Engine Controls Schematics
Scan Tool Reference
Control Module References for scan tool information
Special Tools
• | CH-47976
Active Fuel Injector Tester (AFIT) |
Component Testing
Fuel Injector Balance Test with Special Tool
- Ignition ON, verify that the scan tool engine coolant temperature (ECT) parameter is less than 94°C (201°F).
⇒ | If the ECT is greater than 94°C (201°F) allow the engine to cool before proceeding. |
- Turn OFF all accessories.
- Turn OFF the ignition.
Note: DO NOT connect the
EL-39021-460
until prompted by the AFIT.
- Install the AFIT. Refer to the AFIT User Guide.
- Turn ON the AFIT and select the vehicle.
- Turn ON the ignition and perform the Injector Test.
- View the test results.
⇒ | If any injector exceeds the recommended tolerance, replace the injector(s). |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Fuel Injector and Fuel Rail Replacement