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6
Section 6 – Ford Diagnostics

FORD 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 automatically recognizes the
computer system installed.
If the function is not supported by the vehicle, than the scan tool
does not display it.
✓Ford vehicles manufactured from 2002 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 Control 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 page 9-2.
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 Continuous Memory
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 vehicle’s memory at the time of
occurrence during continuous self-test monitoring. They will 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 data stream.
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.