19
• Perform a brief Wide-Open-Throttle
(WOT) action right after the Dynamic
Response
signal.
(Completely
press and
release
throttle.)
• Some
vehicles do
not use this signal – no throttle
action is necessary.
9) Get Codes from the Flashing STO
Light.
• The KOER (Key On Engine
Running) codes are sent 4 to 15
seconds after the Dynamic
Response signal. There are no other
code groups or separator signals
sent.
• Pay no attention to the brief, rapid
blinks which occur before the regular
codes are sent.
• Count flashes to get service codes.
This is done the same way as in
Self-Test Part 2.
Code 12 looks like:
❊
PAUSE
❊❊
FLASH (pause) FLASH FLASH
(FLASH = 1, FLASH FLASH = 2.
Put 1 and 2 together = code 12.)
Code 23 looks like:
❊❊
PAUSE
❊❊❊
FLASH FLASH (pause)
FLASH FLASH FLASH
NOTE: Certain 1991 and newer vehicles
use 3 digit codes (refer to vehicle service
manual to determine whether your
system uses 2 or 3 digit codes).
These codes are sent as follows:
Code 123 looks like:
❊
PAUSE
❊❊
PAUSE
❊❊❊
FLASH (pause) FLASH FLASH (pause)
FLASH FLASH FLASH
• The KOER (Key On Engine
Running) codes are sent as a
group.
— The KOER group will always
contain at least one code. This will
be a “system pass” code (11 or 111)
if no problems are seen.
— The KOER code group is sent
twice (so you can double check your
code list).
• Code sequence example with
KOER codes = 21 and 32:
❊❊
PAUSE
❊
FLASH FLASH (pause) FLASH
(longer pause).
❊❊❊
PAUSE
❊❊
FLASH FLASH FLASH (pause)
FLASH FLASH
(longer pause).
❊❊
PAUSE
❊
FLASH FLASH (pause) FLASH
(longer pause).
❊❊❊
PAUSE
❊❊
FLASH FLASH FLASH (pause)
FLASH FLASH
• Write down codes in the order they
are sent.
• Code definitions are listed in
Section 5, “Code Meanings (EEC-IV
system).”
10) Turn Ignition Key to OFF Position.
Refer to KOER Test Results chart
following.
