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Ford Enhanced (OBD II) Diagnostics
6
When the vehicle has finished the test,
the DTCs found display on the screen.
If no codes are read, the System Pass
screen is displayed.
Use
arrow keys to view
Codes.
Press the
key to return to the Ford Function List or to return to
the Quick Tests screen.
KOER Cyl. Cont.
The
KOER Cyl. Cont.
is an on-demand test performed with the engine running,
the A/C OFF and engine oil temperature above 76.6C (170°F). This test deter-
mines that all cylinders are contributing equally to engine performance.
The PCM first tests the cylinders in numeric order (1 – 8) for a bad/weak cyl-
inder. If all cylinders check good, a 4 cylinder test is then executed (if a weak
cylinder is detected in the 8 cylinder test, the four cylinder test will not be
started).
During the test, the engine will emit smoke, and the RPM varies with each check
(there is no audible difference in RPM if a bad/weak cylinder is detected).
Exhaust gases are harmful or FATAL. Always operate
vehicle in a well-ventilated area.
The KOER cylinder contribution test is done with the
engine running. Set the parking brake and place the
transmission in DRIVE (
Automatic Transmissions only
).
Do not over-rev engine. Observe all safety precautions.
Select
KOER Cyl. Cont.
from the
Quick Tests
screen.
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. Start Engine — Let Idle.
When the vehicle has finished the test, the DTCs found display on the screen.
Use
arrow keys to view
Codes.
If no Codes are read, the System Pass
screen is displayed.
Press the
key to return to the
Ford Function List or
to return
to the Quick Tests screen.
KOER Switch
The
KOER Switch
is a functional test performed On-Demand with the engine
running. The test is designed to set DTCs if one or more switches fail to tran-
sition from one state to another (i.e. - cycle ON/OFF). Upon initiating the test,
wait 5 seconds before beginning the driver-operated controls. This eliminates
the possibility of setting false DTCs with the cruise/speed control switches.