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Ford Historic (OBD I) Diagnostics
6
✓ If a KOER code of 98 or 998 is
detected, then the fault must be
fixed before performing this
function. Press the
BACK key
to return to the Diagnostic
Codes Menu.
✓ Otherwise, the timing remains
fixed for 90 seconds to allow you
to measure it with the timing light.
✓ Computed timing is equal to the
base timing plus 20 degrees
before top dead center (BTDC)
with 3 degrees tolerance. The
base timing value is printed on the
vehicle emission control
information (VECI) decal.
2. Return to Diagnostic Codes Menu.
•Press
ENTER .
Erase Codes
✓ The service manual may recommend erasing Continuous Memory
Codes from the vehicle’s memory, and then driving the vehicle to
duplicate the malfunction before beginning a diagnostic test. If
KOEO codes were read using Fast Codes, the memory codes
have already been erased.
EEC-IV Erase Codes
From the Diagnostic Codes Menu:
1. Select Erase Codes.
•Use the
UP
or
DOWN
arrow keys until Erase Codes
is highlighted.
•Press
ENTER.
Can't run timing
check. Code 98/998
detected. Fix fault
& redo timing check.
Press BACK to exit.
Computed Timing
Timing is now fixed
at base timing plus
20 degrees (+/- 3 deg).
Time remaining: 1:30
Computed Timing
Read KOEO Codes
Read KOER Codes
Erase Codes
IVSC Speed Ctrl
Review Data
Print Data
Code Lookup
Diagnostic Codes Menu
Erase Codes
