Key ON Engine OFF (KOEO) Injector Electrical Self-Test

The KOEO injector electrical self-test is a functional test of the PCM carried out with the ignition ON and the

engine OFF. This test determines if the injectors and circuits are correctly operating. If a concern is detected by the PCM, the corresponding DTCs are displayed at the end of the self-test.

• 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 self-tests.
• Carry out the necessary vehicle preparation and a visual inspection. Refer to QUICK TEST DESCRIPTION 
• Refer to the scan tool manufacturers manual for instructions.
• Ignition ON, engine OFF.
• Carry out the KOEO injector electrical self-test.
• Ignition in OFF position.
• Record the DTCs and carry out the appropriate pinpoint test.