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5 - 60
BRAKES - ABS
TRACTION CONTROL SWITCH (Continued)
INSTALLATION
(1) Install switch through top of upper shroud and
snap into place (Fig. 14).
(2) Install the upper and lower steering column
shrouds onto the lock housing of the steering column.
As upper shroud is installed, guide traction control
"OFF" switch wiring pigtail down right side of col-
umn and connect wiring connector to column har-
ness.
(3) Install and securely tighten screws attaching
steering column shrouds to column lock cylinder
housing to 1.9 N·m (17 in. lbs.) torque (Fig. 13).
(4) Install instrument panel trim bolster below
steering column. (Refer to 23 - BODY/INSTRUMENT
PANEL/INSTRUMENT PANEL TRIM - INSTALLA-
TION)
(5) Connect remote ground cable to ground stud on
left front shock tower.
(6) Close hood.
(7) Connect DRBIII
link connector and check for any faults.
(8) Road test vehicle checking operation of traction
control and switch.
scan tool to diagnostic data
HCU (HYDRAULIC CONTROL
UNIT)
DESCRIPTION
The hydraulic control unit (HCU) is mounted to
the CAB as part of the ICU (Fig. 20). The HCU con-
trols the flow of brake fluid to the brakes using a
series of valves and accumulators. A pump/motor is
mounted on the HCU to supply build pressure to the
brakes during an ABS stop.
OPERATION - HYDRAULIC CIRCUITS AND
VALVES
The hydraulic fluid control valves within the HCU
control the flow of pressurized brake fluid to the
wheel brakes during the different modes of ABS
braking. The following paragraphs explain how this
works. For purposes of explanation only, it is
assumed that only the right front wheel is experienc-
ing antilock braking; the following diagrams show
only the right front wheel in an antilock braking
operation.
JR
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