Actron GM Code Scanner CP9001 - Manual (Page 58)

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SYSTEM 2:
Bosch 2U (Version A)
1990 Brougham
1991 Caprice, Custom Cruiser, Roadmaster
1992 Brougham
Pre-Diagnostic Visual Inspection
Complete all steps before reading
trouble codes!
1) Check that all ABS system
grounds are clean and tight.
• 1990 Brougham:
–Check the ground that is located
on the right front corner of the right
fender.
–Check the ground that is located
near the cruise control servo on
the fender.
• 1991 Caprice, Custom Cruiser,
Roadmaster:
–Check the 2 grounds that are
located near the left headlight. One
is on the headlight support in front
of the vapor canister, the other is
close to the wiring harness.
–Check the ground that is located
near the center of the left rear
quarter panel.
–Check the ground that is located
near the thermostat housing.
• 1992 Brougham:
–Check the ground that is located
on the right front corner of the right
fender.
–Check the ground that is located
near the cruise control servo on the
fender.
2) Check power sources which
supply various parts of ABS
system.
• 1990
Brougham:
–Check the
GA-TRANS
fuse in the
underdash
fuse block.
–Check the ABS fuse in the
underdash fuse block.
–Check the STOP/HAZ fuse in the
underdash fuse block.
–Check the rust colored fusible links
on the positive junction block.
• 1991 Caprice, Custom Cruiser,
Roadmaster:
–Check fuse number 3, 17 and 19 in
the main fuse block.
–Check the rust colored fusible link
D on the positive junction block.
• 1992 Brougham:
–Check the GA-TRANS fuse in the
underdash fuse block.
–Check the ABS fuse in the
underdash fuse block.
–Check the rust colored fusible link
E on the positive junction block.
3) Check that the over-voltage relay,
ABS 6-way connector, and EBCM
(Electronic Brake Control Module)
connectors are properly installed
(not loose).
4) Check that the parking brake
switch is functioning properly.
This completes the visual inspection.