Step 3-Select A Test; Injector Test - Bosch CH-47976 User Manual

Injector Test

Step 3—Select a Test
Once a vehicle is selected or cleared, AFIT returns to the Main Menu. You will start the Injector
test, Pressure test, and Leak Down test from this screen. Utility Functions and Vehicle Selection
are also accessed from this screen (see Utilities or Step 2—Select Vehicle for further information).
Injector Test
There are three options to choose from:
• Run New Test—tests the fuel injector flow characteristics.
After selecting Run New Test, follow the on-screen directions to complete the test procedure.
Note: it is important to follow these directions for AFIT to successfully complete the fuel
injector flow tests.
The directions will vary slightly depending on the vehicle selected, however, they will
basically follow these steps:
1. Start the vehicle and run at idle until instructed by AFIT to turn the engine off. This will
take approximately one to two minutes.
2. Turn the key to the ON position, but do not start the vehicle. AFIT begins the test.
After a 30 second Leak Down Test, AFIT instructs you to connect the injector harness cable
(or J-Cable Adapter and cable), and if required, the fuel pump cable if a direct connection is
required.
If the engine coolant temperature (ECT) is 204°F or higher: AFIT displays a message
notifying you that the temperature is above the injector test's recommended range. You
are given the option to cancel the test, or continue with the test.
If the tester cannot communicate with the vehicle: AFIT displays a screen with the
following options for you to select: Try Again, Cancel Test, and Continue Anyway.
3. AFIT runs a complete flow test that lasts two to four minutes depending on the number of
cylinders. When the test is complete, AFIT returns to the Injector Test screen.
Main Menu
Pressure Test Leak Down Test Vehicle Selection Utility Functions
Active Fuel Injector Tester User Guide
Testing
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