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About the Ford Code Reader
FUNCTIONS OF THE FORD CODE READER
Chapter 3 20
The vehicle's computer generates and assigns fault codes
whenever it detects a problem in any of the various systems
that it monitors and/or controls. Once the Code Reader is
connected to the vehicle's Test Connector(s), the user can
signal the computer to perform the Self-Tests (by pressing the
TEST/HOLD button). The computer then starts performing a
Self Test of all the components and/or circuits it controls. The
results of the tests are sent to the code reader as numerical
codes to help the repairperson pinpoint a particular problem in
any of the computer control systems.
This Code Reader is designed to retrieve Diagnostic Trouble
Codes from Ford EEC-IV and MCU systems only.
Code Reader Controls and Indicators
1. Code Reader Connector - Connects to the vehicle's six-
pin Test Connector (the six-pin test connector is used on
both MCU and ECC-IV systems).
2. Code Reader Connector - Connects to the vehicle's
single-pin Test Connector. (the single-pin Test Connector
is used on EEC-IV systems only; MCU systems are not
equipped with single pin test connectors).
3. LCD Display - Displays test results, Diagnostic Trouble
Codes and Code Reader functions.
4. ON/OFF Button - Turns the code reader On and Off.
5. TEST/HOLD Button: Toggles between TEST and HOLD
functions.
MEMORY ON / OFF
TEST / HOLD
FORD LINCOLN MERCURY
Domestic vehicles 1981 to 1995
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