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Ford Enhanced (OBD II) Diagnostics
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6
Quick Tests (7.3L Powerstroke Diesel Only)
These additional
Quick Tests
are available when testing a truck equipped with
a 7.3L Powerstroke Diesel engine.
KOEO Inj. Buzz
The
KOEO Inj. Buzz
is a functional test performed on demand with the ignition
key ON and Engine OFF. The test determines if the injector circuits and sole-
noids are operating electrically correct and without faults.
All injectors are buzzed initially (audible feedback of solenoids energizing the
valves) for approximately 2 seconds. Then each injector will buzz individually
for approximately 1 second, in numerical order (1 – 8).
Select
KOEO Inj. Buzz
from the Quick
Tests screen, press
.
Perform the following:
1) Set Parking Brake.
2) Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Turn Key On-Engine Off. (Do Not Start
).
Press
to start the test. Listen for
one long buzz and then 8 short equal
buzzes as each fuel injector is ener-
gized.
Press the
key to return to the
Ford Function List or
to return
to the Quick Tests screen.
KOER Glow Plug
The
KOER Glow Plug
is an on-demand test which activates the glow plug relay
and detects any difference in the amount of current between both banks of glow
plugs. DTCs returned from the test indicate which bank has failed glow plugs
or failed wiring.
Exhaust gases are harmful or FATAL. Always operate
vehicle in a well-ventilated area.
The KOER glow plug test is done with the engine running.
Do not over-rev engine. Observe all safety precautions.
✓ Battery Voltage must be between 11.8 and 14.0 volts for the Glow Plug
Test. To maintain battery voltage, increase engine RPM. If required, mon-
itor battery voltage during the test using a voltmeter.
Select
KOER Glow Plug
from the
Quick Tests screen. Perform the fol-
lowing:
1) Set Parking Brake.
2) Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Start Engine — Let Idle.