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6
Section 6 – Ford DiagnosticsFORD HISTORIC SELF-TEST ROUTINES
Due to different processor calibrations, the Ford Function List for a particular
vehicle may or may not appear as shown. Based on the vehicle information
entered at the Vehicle Setup menu, the tool auto matically recogni zes the com-
puter system installed.
If the function is not supported by the vehicle, than the scan tool
does not display it.
✓Ford vehicles manufactured from 2000 to present automatically use Global
OBD II Diagnostics.
✓Most Ford vehicles prior to 1996 use the EEC-IV system. Vehicles with
Mazda-sourced engines use the Mazda Electronic Cont rol System (MECS) .
Refer to “
Appendix A - Data Link Connectors
".
✓ If the Scan Tool displays an
Error Message
, make sure the adapter cable
is securely attached and the ignition key is ON. Cycle the ignition key to
OFF for 10 seconds, then ON. This may be required because the Ford
system allows only one Self-Test function to be performed for each Key
ON. Attempt the test selected again and if the problem remains, refer to
“
Error Messages
” on page8-2.
Manual Info
The
Manual Info
function instructs the user what section of the manual to use.
This section covers
Ford Historic Self-Test Routines
Read KOEO Codes
The
Read KOEO
Codes
function activates the KOEO (Key On Engine Off) and
Continuous Memory self-tests which retrieves KOEO and Con tinuou s Memory
DTCs from the PCM.
•
KOEO DTCs
are transmitted through the PCM data link when a trouble c on-
dition is active. KOEO codes remain until the trouble condition becomes
inactive – usually when the fault is repaired.
•
Continuous Memory DTCs
are stored in vehicle’s memory at the time of
occurrence during continuous self-test monitoring. They will rema in 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. Contin-
uous memory codes follow the KOEO codes in the data stream.
The DTCs are transmitted in two formats; both transmit the same i nformat ion:
•
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 diag-
nostic tool. Retrieving Fast Codes erases Continuous Memor y Codes, Sl ow
Codes does not.
Fast Codes
do not apply to MECS vehicles.
Select
Read KOEO Codes
from the
Ford Function List
and press .