Key On Engine Off (KOEO) Injector Buzz Test

PURPOSE
To determine if the injectors are electronically capable of firing and provide the technician with a fault code and audible feedback for injector operation.

After a Key On Engine Off (KOEO) test with the engine off and on operator demand, this test will rapidly electronically fire all of the injectors then repeatedly fire an individual injector in numerical sequence. Reading any subsequent fault codes and/or listening for the injector buzz will allow the technician to determine if the injector solenoids are functioning.

Equipment Hook-up:

RECOMMENDED PROCEDURE
It is recommended that all present and historical faults be corrected before performing this test.

With all accessories OFF and the ignition key OFF, connect the Super STAR II Tester to the diagnostic connector under the hood. Latch the center button on the Super STAR II Tester ON and turn the ignition key to the RUN position.

Depress and release the brake pedal during slow code transmission to abort standard KOEO tests. Depress and release the accelerator to start the injector buzz test.

All injectors will rapidly fire for approximately 2 seconds. Individual injectors will buzz in approximately 1 second intervals in numerical order (1 through 8).

At the end of the test either a pass code will be transmitted or fault code(s) indicating which injector(s) could not be enabled.

POSSIBLE CAUSES
Open injector wire, bad injector connector, shorted wire or connector, open solenoid or defective Injector Driver Module (IDM).

TOOLS REQUIRED
Rotunda Super STAR II Tester 007-0041B