Actron GM Code Scanner CP9001 - Manual (Page 59)

59
Perform FUNCTIONAL CHECK before
reading codes!
Functional Check
Brougham
1) Start the engine.
The brake
warning lamp should come ON
during engine cranking, and turn
OFF shortly after the engine starts. If
it does not, check the brake warning
lamp circuit in accordance with
vehicle service manual instructions.
2) Turn the engine OFF. Turn the
ignition key to the ON (RUN)
position, but do not start the engine.
The anti-lock lamp should illuminate
for about 4 seconds and then turn
OFF, if no trouble codes are
currently stored. However “history”
trouble codes may be stored.
Proceed directly to Step 3 below. If
the anti-lock lamp stays ON, trouble
codes are stored. Proceed directly to
READING ABS CODES.
3) Drive the vehicle at least 20 MPH. If
the anti-lock lamp turns ON,
proceed to READING ABS CODES.
Caprice, Custom Cruiser, Roadmaster
1) Start the engine. The brake warning
lamp should come ON during engine
cranking, and turn OFF shortly after
the engine starts. If it does not,
check the brake warning lamp circuit
in accordance with vehicle service
manual instructions.
2) Turn the engine OFF. Turn the
ignition key to the ON (RUN)
position, but do not start the engine.
The anti-lock lamp should illuminate
for about 2 seconds and then turn
OFF if no trouble codes are currently
stored, however “history” trouble
codes may be stored. Proceed to
Step 3 below. If the anti-lock lamp
stays ON, trouble codes are stored.
Proceed directly to READING ABS
CODES. If the anti-lock lamp does
not turn ON at all or flashes very
briefly (less than 1/2 of a second), a
problem exists in the anti-lock lamp
circuitry. See your vehicle service
manual.
3) Drive the vehicle at least 20 MPH. If
the anti-lock lamp turns ON,
proceed to READING ABS CODES.
Reading ABS Codes:
Bosch 2U (Version A)
IMPORTANT: Perform all steps in
PRE-DIAGNOSTIC VISUAL INSPEC-
TION and FUNCTIONAL 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) 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 Communication 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