Equus 3145 - Digital Ford Code Reader (1981 - 1995) - Manual (Page 38)

Retrieving Codes
KOER SELF TEST (EEC-IV SYSTEMS)
35 Chapter 4
■ Code 10 is not a fault code.
The vehicle's computer uses
code 10 to signal the Code
Reader operator to perform
a Wide Open Throttle
(WOT) test (quickly press
and release the accelerator
pedal).
This procedure is called the Dynamic Response
Check. The computer uses this brief Wide-Open
Throttle (WOT) test to verify the operation of the
Throttle Positioning, Mass Airflow, Manifold Absolute
Pressure and Knock Sensors.
■ If you fail to press the accelerator to the floor as
instructed in step 9, a Dynamic Test Failure Code
may be generated.
10. After the dynamic test is completed (if applicable), the
vehicle computer proceeds to test the actuators, switches,
relays and their related circuits. If any problems are detected
in any of these components or circuits as they are tested, a
Diagnostic Trouble Code is sent to the Code Reader.
NOTE: Each code is repeated two times.
11. If no problems are found during
the KOER Self Test, the computer
sends a “pass code” (code 11 or
111) to the Code Reader.
■ Code 11 or 111 indicates that
all the relays and actuators
and their related circuits
that were tested during the
KOER Self-Test are OK, and
no faults were found.
NOTE: Most Ford EEC-IV vehicle computers up to 1991
use a two-digit code system. From 1991 to 1995 most use a
three-digit code system.
12. After all the KOER Self Test codes are received by the
Code Reader (wait until the flashing square icon no longer
appears on the screen for 30 consecutive seconds to ensure
that all the codes have being retrieved), turn the Code
Reader off, turn the engine off, and disconnect the Code
Reader from the vehicle's test connectors. The codes
received are now stored in the code reader's memory.
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