6a. KOEO Injector Electrical Self-Test

6a. KOEO INJECTOR ELECTRICAL SELF-TEST

NOTE:
- Before carrying out the KOEO injector electrical self-test, allow the engine to stabilize at the temperature necessary to recreate the symptom. Access the PCM and record the freeze frame data. The freeze frame data contains information which can be used to recreate original conditions that caused the symptom. Refer to Diagnostic Methods, Freeze Frame Data for more information. Freeze Frame Data
- If unable to carry out the KOEO Injector Electrical Self-Test and DTCs are present, refer to the applicable pinpoint test. If unable to carry out the KOEO Injector Electrical Self-Test and DTCs are not present, disconnect the harness connector at the fuel injector control module (FICM) and test the suspect fuel injectors for an open or short.

Purpose:
The purpose of this test is to determine if the injector coils and valves are functioning by energizing all injectors together and then each injector in numerical sequence (1 through 8).

KOEO Injector Electrical Self-Test

NOTE:
- Sequence repeats three times.
- DTCs can be historical if not cleared from a previous test.
- When all 8 fuel injector DTCs are retrieved together or all fuel injectors within an engine bank indicate a concern GO to Pinpoint Test S. Test S: Fuel Injector Control Module (FICM) Low Voltage

- Use the scan tool. Injector DTCs will be transmitted after the self-test is completed.
- All the injectors momentarily click, then each injector clicks in sequence 1 through 8.

6.0L Engine, Cylinder And Fuel Injector Location:

Recommended Procedure:
This test determines if the injector circuits and coils are correctly operating. All injectors click simultaneously for approximately 2 seconds, then each individual injector clicks for approximately 1 second in numerical order 1 through 8. If an electrical concern is present, a DTC sets and outputs on the data link at the end of the test when requested by a scan tool.

- Connect the scan tool.
- Turn OFF all accessories. If the vehicle is equipped with a power take-off (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 Diagnostic Methods, Vehicle Check/Preparation. Vehicle Check/Preparation
- Refer to the scan tool operating 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.

Possible Causes:
- Open or shorted injector circuit
- Injector connector
- Injector coils
- FICM power or ground circuit
- FICM

Tools Required:
Scan tool