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Retrieving Codes
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
Chapter 4 38
NOTE:
As soon as the TEST/HOLD button is pressed
the vehicle's computer enters the Self Test mode.
Clicking sounds will be heard coming from the engine.
This is normal. It indicates that the vehicle's computer
is activating relays, solenoids, and other components
to check on their operation.
WARNING:
On some vehicles equipped with an
Electric Cooling Fan, the computer activates the
cooling fan to check its operation. To avoid
injury, keep hands or any part of your body a
safe distance from engine during the test.
6. After 6 to 10 seconds (it may take longer on some vehicles)
the computer will start sending the KOEO Self Test
results to the Code Reader in the form of numerical codes.
■ 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.
7. As soon as the code reader
starts receiving codes, press and
release TEST/HOLD button to
put Code Reader on HOLD.
■ The Code Reader must be
put on HOLD while it is
retrieving codes in order for
“Continuous Memory” codes
to be erased from the
computer's memory.
8. "Continuous Memory" codes are erased.
9. Turn off the ignition and disconnect the Code Reader from
the test connectors.
ADDITIONAL TESTS FOR EEC-IV SYSTEMS
NOTE:
These tests are additional, supplemental tests, and are
not needed to retrieve Diagnostic Trouble Codes. Ford has
included them to further assist the technician / do-it-yourselfer
in the troubleshooting of vehicle problems.
4
MEMORY ON / OFF
TEST / HOLD
FORD LINCOLN MERCURY
Domestic vehicles 1981 to 1995
E C M A B S
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