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Ford Historic (OBD I) Diagnostics
6
4. View and write down DTCs.
•Use
UP
or
DOWN
arrow
key.
✓ENG indicates that DTC is from
the engine or powertrain control
module.
✓After viewing and noting the
KOEO codes, use the
DOWN
arrow key to view continuous
memory codes.
✓Continuous memory codes
(codes set previously under
normal driving conditions) are
available after reading KOEO
codes. They are indicated as
Memory Codes by the Scan Tool.
5. Return to Diagnostic Codes Menu.
•Press
BACK.
Read KOER Codes
✓The Read KOER Codes function activates the KOER self-test
which retrieves KOER DTCs that are present when the engine is
running.When the trouble condition is inactive, the KOER code is
no longer sent through the data stream. This function also
performs a Computed Timing Check for EEC-IV vehicles
manufactured from 1984 through 1991.
✓The DTCs are transmitted in two formats which 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. MECS vehicles do not support Fast Codes.
1 of 3
ENG
Excessive converter
clutch sli ppage.
KOEO
628
2 of 3
ENG
MAP sensor signal
voltage higher or
lower then expected.
MEMORY
126