Actron GM Code Scanner CP9001 - Manual (Page 87)

87
Reading ABS Codes:
Kelsey-Hayes RWAL
IMPORTANT: Perform all steps in
DIAGNOSTIC CIRCUIT CHECK
before reading ABS codes!
1) Take Safety Precautions
• Set parking brake, block drive
wheels.
• Put shift lever in PARK (automatic
transmission) or NEUTRAL
(manual transmission).
• Make sure ignition key is in OFF
position.
2) Verify ABS Problem Currently
Exists
• Turn the ignition key to the ON
position, but do not start the
engine.
WARNING: Stay away from the
radiator cooling fan! It may turn
on.
• Wait 5 seconds, and then observe
the brake warning light.
– Brake light OFF: ABS computer
does NOT detect a current
problem. Do not proceed with this
test! A false code 9 will be stored
in ABS computer memory if the
code reading steps are followed
when no faults currently exist! Turn
the ignition key OFF and stop
testing.
– Brake light ON: An ABS problem
currently exists. At least one
trouble code is stored in computer
memory. Go to step 3 and continue
code reading procedure.
3) Find the Computer Test Connec-
tor
• Service manuals call this connector
the Assembly Line Diagnostic Link
(ALDL) connector. It may also be
called the Assembly Line Communi-
cation Link (ALCL) or simply test
connector.
• The connector is located under the
dashboard on the driver’s side.
O
FF
ON
T E S T
ABS ENGINE
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GM 1982 & higher - CP 9001 Car C om pu ter C od e R ead er
• The connector may be in full view,
or it may be recessed behind a
panel opening.
• The connector
may have a
slip-on cover
labeled
“Diagnostic
Connector.”
Remove cover for testing. Replace
cover after testing. Some vehicles
require this cover in place for
proper operation.
4) Verify Ignition
Key is ON and
Engine is OFF
5) Put the TEST switch on ABS
6) Plug the Code Scanner into the
Test Connector
• The Code Scanner only fits ONE
WAY into the test connector.
• The Code Scanner will not harm
the vehicle computer.
Note: The Code Scanner does not
use all of the test connector
contacts. This is normal.
7) Get the Code from the Flashing
“Brake” Light
• Count flashes to get the trouble
code.
– Flashes begin after 20 seconds,
or more.
– The code starts with one long flash
and is followed by several short
flashes. Count the long flash along
with the short flashes to get the code
number. After a pause, the code is
repeated.