Actron GM Code Scanner CP9001 - Manual (Page 70)

70
SYSTEM 4:
Bosch 2U (Version C)
1993 Eldorado, Seville
1994 DeVille, Eldorado, Seville
Pre-Diagnostic Visual Inspection
Complete all steps before reading
trouble codes!
1) Check that all ABS system
grounds are clean and tight.
–Check the ground that is located
on the bottom left side of the
engine block, near the transaxle.
–Check the ground that is located
on the left rear seat brace.
2) Check power sources which
supply various parts of ABS
system.
–Check fuse A1
(10 amp) in
the trunk
compartment
fuse block.
This fuse
provides switched power to the
EBCM.
–Check fuse B3 (20 amp) in the
engine compartment fuse block.
This fuse provides continuous
power to the brake light switch.
–Check fuse A3 (10 amp) in the
engine compartment fuse block.
This fuse provides switched power
to the amber anti-lock indicator
lamp.
–Check fuse # 5 (50 amp) in the
right MAXI fuse block. This fuse
provides continuous power to the
relays in the brake pressure
modulator valve assembly.
–Check the fusible links on the
junction block.
3) Check that all ABS/TCS connec-
tors, and EBTCM (Electronic
Brake and Traction Control
Module) connectors are properly
installed (not loose).
4) Check that the parking brake
switch is functioning properly.
5) Check that the brake pressure
modulator valve ground stud is
clean and tight.
This completes the visual inspection.
Perform FUNCTIONAL CHECK before
reading codes!
Functional Check
DeVille, Eldorado, Seville
1) Start the engine. The anti-lock lamp
should come ON during engine
cranking, and turn OFF shortly after
the engine starts. If...
–The lamp does NOT turn OFF
after engine start, or
–The “ANTILOCK DISABLED”
message appears, or
–The “TRACTION DISABLED”
message appears,
then proceed to READING ABS
CODES, page 69.