Chrysler Pacifica. Manual — part 462
(12) Fill master cylinder with clean, fresh Mopar
t
Brake Fluid or equivalent, then bleed base brakes
and ABS. (Refer to 5 - BRAKES - STANDARD PRO-
CEDURE)
(13) Road test vehicle to ensure proper operation
of brakes.
INTEGRATED CONTROL UNIT -
MK25E
DESCRIPTION
The
Hydraulic
Control
Unit
(HCU)
and
the
Antilock
Brake
Module
(ABM)
used
with
this
antilock brake system are combined (integrated) into
one unit, which is called the Integrated Control Unit
(ICU) (Fig. 18). The ICU is located below the master
cylinder in the engine compartment. It is mounted to
the left frame rail.
The ABS ICU consists of the following components:
the ABM, eight (build/decay) solenoid valves (four
inlet valves and four outlet valves) and one hydraulic
pump motor.
The ABS ICU with traction control consists of the
following components: the ABM, eight (build/decay)
solenoid valves (four inlet valves and four outlet
valves), two master cylinder isolation valves, two low
pressure feed valves and one hydraulic pump motor.
The replaceable components of the ICU are the
HCU and the ABM. No attempt should be made to
service any individual components of the HCU or
ABM. For information on the ABM, (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MOD-
ULES/ANTILOCK BRAKE MODULE - DESCRIP-
TION).
REMOVAL
(1) Disconnect negative (-) battery cable from bat-
tery post and isolate.
CAUTION: Vacuum in power brake booster must be
pumped down (removed) before removing master
cylinder from power brake booster. This is neces-
sary to prevent power brake booster from sucking
in
any
contamination
as
master
cylinder
is
removed. This can be done simply by pumping
brake pedal, with vehicle’s engine not running, until
a firm feeling brake pedal is achieved.
(2) With engine not running, pump brake pedal
until a firm pedal is achieved (4-5 strokes).
(3) Remove nuts fastening coolant recovery bottle
in place and reposition bottle with hoses attached out
of way. (Refer to 7 - COOLING/ENGINE/COOLANT
RECOVERY PRESS CONTAINER - REMOVAL)
CAUTION: Before removing master cylinder from
power brake vacuum booster, master cylinder and
vacuum booster must be thoroughly cleaned. This
must be done to prevent dirt particles from falling
into power brake vacuum booster.
(4) Thoroughly clean all surfaces of brake fluid
reservoir and master cylinder, paying special atten-
tion to area where master cylinder attaches to power
brake booster. Use only Mopar
t Brake Parts Cleaner
or equivalent.
(5) Disconnect
wiring
harness
connector
from
brake fluid level switch in master cylinder brake
fluid reservoir (Fig. 19).
(6) Disconnect primary and secondary brake tubes
coming from master cylinder at ABS ICU (Fig. 20).
Cap off brake tubes and install sealing plugs in open
brake tube outlet ports of ICU.
(7) Remove two nuts attaching master cylinder to
power brake booster (Fig. 19).
(8) Slide master cylinder straight out of power
brake booster and remove (Fig. 19).
Fig. 18 Integrated Control Unit
1 - ANTILOCK BRAKE MODULE (ABM)
2 - HYDRAULIC CONTROL UNIT (HCU)
3 - PUMP/MOTOR
CS
BRAKES - ABS
5 - 63
INTEGRATED CONTROL UNIT - MK25 (Continued)
(9) Disconnect four Chassis brake tubes at ABS
ICU (Fig. 21). Cap off brake tubes and install sealing
plugs in open brake tube outlet ports of ICU.
(10) Disconnect the 47-way connector from the
antilock brake module (ABM) by depressing the tabs
on each side of the connector cover (Fig. 22), then
pulling outward and upward on the lower half of the
cover until it locks into position pointing straight
outward. The connector can then be pulled straight
outward off the ABM (Fig. 23).
(11) Loosen 2 bolts fastening ABS ICU bracket to
frame rail (Fig. 24).
(12) Lift ICU off frame rail bolts and remove from
vehicle.
(13) If ABM and HCU need to be separated, (Refer
to 5 - BRAKES/HYDRAULIC/MECHANICAL/ICU
(INTEGRATED CONTROL UNIT) - DISASSEMBLY)
Fig. 19 Master Cylinder Mounting
1 - MASTER CYLINDER
2 - SENSOR WIRING HARNESS CONNECTOR
3 - BOOSTER
4 - MOUNTING NUT
Fig. 20 Primary And Secondary Brake Tubes At ICU
1 - MASTER CYLINDER
2 - PRIMARY BRAKE TUBE
3 - ICU
4 - SECONDARY BRAKE TUBE
Fig. 21 Chassis Brake Tubes At ICU
1 - LEFT FRONT CHASSIS BRAKE TUBE
2 - RIGHT FRONT CHASSIS BRAKE TUBE
3 - ICU
4 - LEFT REAR CHASSIS BRAKE TUBE
5 - RIGHT REAR CHASSIS BRAKE TUBE
Fig. 22 ABM Connector Release Tabs
5 - 64
BRAKES - ABS
CS
INTEGRATED CONTROL UNIT - MK25E (Continued)
DISASSEMBLY
(1) If the mounting bracket needs to be removed
from the ICU, remove the single mounting bolt (Fig.
25), then slide the ICU’s mounting pins out of the
grommets in the bracket. Remove the mounting pins
from the ICU as necessary.
(2) If not equipped with traction control, remove
the three screws attaching the ABM to the HCU (Fig.
26).
(3) If equipped with traction control, remove the
four screws attaching the ABM to the HCU (Fig. 27).
(4) Separate the ABM from the HCU (Fig. 28).
Fig. 23 Wiring Harness Connector At ABM
1 - ABM (PART OF ICU)
2 - WIRING HARNESS CONNECTOR
Fig. 24 ICU Mounting
1 - MOUNTING BOLTS
2 - ICU
Fig. 25 ICU Mounting Bolt
1 - ICU
2 - MOUNTING BOLT
3 - MOUNTING BRACKET
Fig. 26 ABM Mounting Screws - Without Traction
Control
1 - MOUNTING SCREWS
2 - ABM
CS
BRAKES - ABS
5 - 65
INTEGRATED CONTROL UNIT - MK25E (Continued)
ASSEMBLY
(1) Clean any debris off the mating surfaces of the
HCU and ABM.
CAUTION: When installing new O-rings or solenoid
valve stem seals, do not use any type of lubricant.
(2) If the seals on the components are not new,
they must be replaced. Each of the solenoid valve
stem seals must be replaced (Fig. 29); do not reuse
solenoid valve stem seals. The pump/motor con-
nector O-ring should also be replaced if not new (Fig.
30).
(3) Align components and install the ABM on the
HCU (Fig. 28).
(4) If not equipped with traction control, install
the three screws attaching the ABM to the HCU (Fig.
26). Tighten the mounting screws to 2 N·m (17 in.
lbs.) torque.
Fig. 27 ABM Mounting Screws - With Traction
Control
1 - MOUNTING SCREWS
2 - ABM
Fig. 28 ABM Assembly To HCU
1 - ABM
2 - HCU
3 - SOLENOID VALVE STEM
Fig. 29 Solenoid Valve Seal
1 - SEAL
2 - SOLENOID VALVE STEM
Fig. 30 Internal Pump Connector O-Ring
1 - O-RING
2 - O-RING MOUNTING GROOVE
5 - 66
BRAKES - ABS
CS
INTEGRATED CONTROL UNIT - MK25E (Continued)
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст