3-2
Using the Tool
3.2 Read Codes
The
Read
Codes
function retrieves
Diagnostic Trouble Codes (DTCs)
from the vehicle’s computer modules.
This function can be performed with
the KOEO or KOER.
There are two types of codes, Malfunction Indicator Lamp (MIL) codes
and Pending codes. An icon (
) will be displayed next to DTCs that
are Pending codes.
MIL
Codes:
These codes cause the computer to illuminate the MIL
when an emission related or driveability fault occurs. The MIL is also
known as the "service engine soon" or "check engine lamp”. The
computer will illuminate the MIL when the engine is running and
remain in the vehicle’s memory until the fault is repaired.
Pending
Codes:
These codes are also referred as “continuous
monitor” and “maturing codes”. An intermittent fault will cause the
computer to store a code in memory. If the fault does not occur within
40 warm-up cycles, the code will be cleared from memory. If the
fault occurs a specific number of times, the code will mature into a
DTC and the MIL will turn on.
Changing
any
part
without
first
isolating
the
circuit
or
system
may
result
in
the
replacement
of
good
components.
Before
performing
this
function,
read
and
understand
the
Safety
Precautions
and
Section
2
-
Tool
Basics
.
CAUTION!
Avoid Cooling Fan! It May Turn On During Test.
Press the
READ
key to initiate the
Read
Codes
function. The
AutoScanner will retrieve the DTCs
stored in the vehicle’s computer
module(s). This function can also be
run by selecting
Read
Codes
from the
Main
Menu
.
I
f
a
Link
Error
message
displays,
make
sure
the
OBD
II
connector
is
securely
attached,
and
the
ignition
key
is
ON.
Cycle
the
ignition
key
to
OFF
for
10
seconds,
then
ON.
This
may
be
required
to
reset
the
computer.
If
required,
select
“Yes”
to
try
again.
If
the
problem
still
exists,
refer
to
Section
4:
Troubleshooting
.
Main Menu
1)Read Codes
]
!
!
!
Reading
* Data From Vehicle *
!
