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Ford Historic Self-Test Routines
6
After viewing and noting the KOEO
codes, use the arrow key to view
Continuous Memory codes.
When done, press to return to
the Ford Function List.
Read KOER Codes
The
Read KOER Codes
function activates the KOER (Key-On-Engine-Run-
ning) self-test which retrieves KOER DTCs that are present when the engine
is running.When the trouble condition is inactive, the K OER Code will no lon ger
be sent through the data stream. This function also per forms a
Computed Tim-
ing Check
for EEC-IV vehicles manufactured from 1984 through 1991.
The DTCs are transmitted in two formats which tr ansmit t he sam e inf ormati on:
•
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 diag-
nostic tool. MECS vehicles do not support Fast Codes.
Exhaust gases are harmful or lethal. Always Operate
vehicle in a well-ventilated area.
The KOER test is done with the engine running. Do not
over-rev engine. Observe all safety precautions.
Avoid Cooling Fan! It May Turn On During Test.
Select
Read KOEO Codes
from the
Ford Function List
and press .
Fast or Slow Codes
Select
Fast Codes
or
Slow Codes
and
press .
Follow the instructions step-by-step.
Failure to perform these steps may set
a false DTC in the PCM — observe the
display.
1) Set Parking Brake.
2) Transmission In Park Or Neutral.
3) Turn A/C Off.
4) Start Engine — Let Idle Until Hot.
5) Turn Ign Key Off.
6) Wait 10 Seconds. Start Engine — Let Idle.
7) If Vehicle Has A Manual Transmission, Release Clutch.
Press to activate the self-test.
✓The following actions do not apply to MECS vehicles.
❒For a 7.3L Diesel, depress the throttle until test is done.
!
WARNING
!
CAUTION
!
CAUTION