User Manual

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5
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This section covers Ford vehicles equipped with EEC-IV and
MECS system from 1984 – 1995. Some Ford trucks still used the
EEC-IV system after 1995. Refer to “Appendix A - Data Link
Connectors".
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 an Operating Error message displays, 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 7-3.
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 format; 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.