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 Freeze Frame Data for more information.

Note: 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 harness FICM circuit injector solenoids and valves are functioning by clicking all injectors together and then each injector in numerical sequence (1 through 8).

KOEO Injector Electrical Self-Test

Note: Sequence repeats three times.

Note: DTCs can be historical if not cleared from a previous test.

Note: 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.

^ Use the scan tool. Injector DTCs are displayed after the self-test is completed.
^ All injectors momentarily click then each injector clicks in sequence 1 through 8.










Recommended Procedure:

This test determines if the injector circuits and solenoids are electrically operating correctly. All injectors will first click together for approximately 2 seconds then each injector will click for approximately 1 second in numerical order (1 a DTC will be present on the data link at the end of the test when requested by a scan tool. Only KOEO and KOER DTCs will be displayed.

^ Connect the scan tool.
^ Turn off all accessories. If vehicle is equipped with a power takeoff (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 Quick Test Operation.
^ Refer to the scan tool operating manual for instructions.
^ Key ON engine OFF.
^ Follow the operating instructions from the diagnostic menu.
^ Carry out the KOEO Injector Electrical Self-Test (Click Test).
^ Record the DTCs and Refer to the appropriate pinpoint test to continue diagnosis.

Possible Causes:

^ Open or short injector circuit
^ Injector connector
^ Injector solenoid
^ FICM power or ground circuit
^ FICM

Tools Required:

Scan tool