Equus 3120 - OBD 2&1 Tool Kit - Manual (Page 57)

OBD2 & 1 55
E
Ford OBD1 Systems
CODE RETRIEVAL PROCEDURES - KOER TEST
8. After the above procedures are per-
formed a "One moment please KOER
test is in progress..." message shows
temporarily on the Tool's LCD display,
followed by a "Retrieving codes" mes-
sage.
9. The first code displayed by the Tool is
the Cylinder Identification (ID) Code.
The Cylinder ID code identifies the num-
ber of cylinders of the vehicle that is
under test.
If code 98 or 998 displays instead
of a Cylinder ID code, the vehicle
is operating in "Failure Mode".
The computer goes into failure
mode when it detects a signal
from a sensor that indicates the
sensor has failed and is com-
pletely out of specifications. The
computer substitutes a fixed sig-
nal value for the failed sensor to
keep the vehicle running. Failure
mode codes 98 or 998 are usual-
ly accompanied by one or more Diagnostic Trouble Codes
that indicate the failed sensor. A vehicle operating in failure
mode is operating at a minimal level, and the faults that are
causing these Diagnostic Trouble Codes to set must be
repaired as soon as possible.
If the Tool fails to retrieve CYL ID and DTCs, its possible that
the KOEO Test was not performed properly before proceed-
ing to the KOER Test. Go back and perform the KOEO Test
(page 48) until a PASS code is obtained.
Most Ford EEC-IV vehicle computers up to 1991 use a two-
digit code system. From 1991 to 1995 most use a three-digit
code system.
10. If no problems are found during the
KOER Self-Test, the computer sends a
"PASS code" (code 11 or 111) to the
Tool. Code 11 or 111 indicates that all
the relays and actuators and their relat-
ed circuits that were tested during the
KOER Self-Test are OK, and no faults
were found.
11. After the Tool retrieves all the KOER Self-Test DTCs, turn the
engine off, and disconnect the Tool from the vehicle's test connec-
tors. The DTCs retrieved are now stored in the Tool's memory.