8. Key On Engine Off (KOEO) Fuel Injector Electrical Self-Test

8. KEY ON ENGINE OFF (KOEO) FUEL INJECTOR ELECTRICAL SELF-TEST

NOTE: If unable to carry out KOEO Fuel Injector Electrical Self-Test, disconnect the PCM connector and check the fuel injector for shorts or opens.

Purpose:
The purpose of this test is to determine if the fuel injectors are functioning.

KOEO Fuel Injector Electrical Self-Test
- Use the scan tool. Fuel injector DTCs are displayed after the self-test is completed.

Cylinder And Fuel Injector Location:

Recommended Procedure:
This test determines if there are any concerns with the operation of the fuel injector circuits. If a concern is detected, a DTC outputs on the data link at the end of the test when requested by a scan tool. Only a hard fault DTC is displayed.

Connect the scan tool. Turn off all accessories. If the vehicle is equipped with a PTO system or auxiliary idle control, it must be turned off to carry out the self-test.
- Carry out the necessary vehicle preparation and a visual inspection. Refer to Diagnostic Methods, Quick Test Operation. Quick Test Description
- Refer to the scan tool operating manual for instructions.
- Ignition ON, engine OFF.
- Follow the operating instructions from the diagnostic menu.
- Carry out the KOEO Fuel Injector Electrical Self-Test.
- Record the DTCs and refer to the appropriate pinpoint test to continue diagnosis.

Possible Causes:
- Open or short fuel injector circuit
- Fuel injector connector
- Fuel injector

Tools Required:
Scan tool