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Ford Historic (OBD I) Diagnostics
6
Read KOEO Codes
✓The Read KOEO Codes function activates the KOEO and
Continuous Memory self-tests which retrieve KOEO and
continuous memory diagnostic trouble codes (DTCs) from the
PCM.
•KOEO DTCs are transmitted through the PCM data link when a
trouble condition is active. KOEO codes remain until the trouble
condition becomes inactive – usually when the fault is repaired.
•Continuous Memory DTCs are stored in the vehicle’s memory at
the time of occurrence during continuous self-test monitoring. They
remain there until the problem does not reoccur within 40 warm-up
cycles, Fast KOEO codes have been read, or the Erase Codes
function has been run. Continuous memory codes follow the KOEO
codes in the datastream.
✓The DTCs are transmitted in two formats; both transmit the same
information:
•Slow Codes are regular service codes that allow the user to identify
the faults with an analog voltmeter or the check engine light. Slow
Codes are transmitted within 3 minutes.
•Fast Codes are transmitted within seconds and must be read with
a diagnostic tool. Retrieving Fast Codes erases continuous memory
codes, Slow Codes does not. Fast Codes do not apply to MECS
vehicles.
From the Diagnostic Codes Menu:
1. Select Read KOEO Codes.
•Use
UP
or
DOWN
arrow
key until Read KOEO Codes
is highlighted.
•Press
ENTER.
2. Select Fast Codes or Slow
Codes.
•Use
UP
or
DOWN
arrow
key until selection is
highlighted.
•Press
ENTER.
Read KOEO Codes
Read KOER Codes
Erase Codes
IVSC Spe ed Ctrl
Review Data
Print Data
Code Lookup
Diagnostic Codes Menu
Read KOEO Codes
Fast Codes
Slow Codes
Select Code Type
Fast Codes