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Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - KOEO TEST
32
NOTES
* Carburetor Model. Carburetor model numbers are usually stamped on top of the carbure-
tor, or on a metal tab attached to the carburetor. Consult your vehicle’s repair manual for
proper identification.
**VIN Number. The VIN number(s) used in this column identify the vehicle’s engine type.
This number is the 8th digit of the VIN (Vehicle Identification Number). Consult your vehicle’s
repair manual for details.
Application Table Definitions. EFI = Electronic Fuel Injection; FBC = Feedback Carburetor;
MFI = Multiport Fuel Injection; OHC = Overhead Cam; SC = Super Charged; SEFI =
Sequential Electronic Fuel Injection; SFI = Sequential Fuel Injection
CODE RETRIEVAL PROCEDURES
Overview of Ford Code Retrieval Process
Ford's computer self-diagnostic system is
divided into four main sections:
1. "Key On Engine Off" (KOEO) Self-Test
2. "Continuous Memory" (CM) Self-Test
3. "Key On Engine Running" (KOER) Self-
Test
4. Other EEC-IV System tests
These Self-Tests are designed to monitor and/or test the components
and circuits that are controlled by the vehicle's computer, and to save
and/or transmit test results to the Scan Tool.
The "Continuous Memory" Self-Test is designed to run continuously
whenever the vehicle is normal operation. If a fault is detected by the
"Continuous Memory" Self-Test, a fault code is saved in the vehicle's
computer memory for later retrieval.
Self-Tests are designed in such a way that in order to properly diagnose
a problem, you must perform all the Self-Tests, in the proper sequence.
If you fail to perform a test, or you perform a test out of sequence, you
might miss a problem that is only detected during that part of the test.
Key On Engine Off (KOEO) Test
During the KOEO Self-Test, two groups of codes are retrieved.
The first group of codes are called "KOEO codes". A "KOEO" icon
shows to indicate code is a "KOEO" code.
The second group of codes are called "Continuous Memory" codes.
A "Continuous Memory" icon shows to indicate the code is a
"Continuous Memory" code.
Check your vehicle thoroughly before performing any test.
ALWAYS observe safety precautions whenever working on a
vehicle.
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