Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 36)

Retrieving Codes
KOER SELF TEST (EEC-IV SYSTEMS)
33 Chapter 4
1. Warm up the vehicle to normal operating temperature.
■ Start the engine, increase engine speed to 2000 RPM,
and maintain engine speed for approximately two to
three minutes. In most cases, this is sufficient to
allow the engine to warm up to normal operating
temperature.
NOTE: Failure to warm engine to normal operating
temperature before performing KOER test might result in a
false Fault Code being sent to the code reader.
2. Turn ignition off.
3. Turn the Code Reader off (press the ON/OFF button, as
necessary), then connect the Code Reader to the vehicle's
test connectors.
■ Both the large and small connectors must be
connected.
4. Turn ignition on and start the engine.
5. Press and release the ON/OFF
button to turn the Code Reader
"ON".
■ Three zeros should be visible
on the display at this time.
6. Press and release the TEST/HOLD button to put the
Code Reader in Test Mode.
■ A square icon (on the right-
hand side of the screen)
displays and flashes each
time the Code Reader
receives a code. The code is
then shown on the Code
Reader’s display.
■ A small “R” is shown in the upper right-hand corner
of the display to indicate that the code being received
is a KOER Self Test Fault Code.
7. The first code displayed by the
code reader is the Cylinder
Identification (ID) Code.
■ The cylinder ID code identi-
fies the number of cylinders
of the vehicle that is under
test.
4
CYL R
R