Actron GM Code Scanner CP9001 - Manual (Page 91)

91
Reading ABS Codes:
Kelsey-Hayes 4WAL
IMPORTANT: Perform all steps in
DIAGNOSTIC CIRCUIT CHECK
before reading ABS codes!
Note (1990, 1991 only): Codes 21, 22,
25, 26, 31, 32, 35, and 36 will disable
ABS system, but are not stored in
computer memory. They are erased
when ignition is turned off. All other
codes are stored in memory when they
occur.
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) Have a Pencil and Paper Ready
This is for writing down all the codes.
3) Find the Computer Test Connector
• Service manuals call this connector
the Assembly Line Diagnostic Link
(ALDL) connector. It may also be
called the Assembly Line Commu-
nication Link (ALCL) or simply test
connector.
• The connector is located under the
dashboard on the driver’s side.
• 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 OFF
T E S T
ABS ENGINE
TM
GM 1982 & higher - CP 9001 Car Computer Code Reader
OF
F
ON
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) Turn Ignition
Key to ON
Position but DO
NOT START THE
ENGINE
WARNING: Stay away from the
radiator cooling fan! It may turn
on.
8) Get Codes from the Flashing
“Anti-Lock” Light
• Count flashes to get trouble codes.
(Flashes begin after a few
seconds.)
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
O
FF
ON