Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 297
ABS BRAKING HYDRAULIC CIRCUIT, SOLENOID
VALVE, AND SHUTTLE VALVE FUNCTION (ABS
WITH TRACTION CONTROL)
The hydraulic diagram (Fig. 17) shows the vehicle
in the ABS braking mode. The diagram shows one
wheel is slipping because the driver is attempting to
stop the vehicle at a faster rate than is allowed by
the surface on which the tires are riding.
• The hydraulic shuttle valve closes upon brake
application so that the pump/motor cannot siphon
brake fluid from the master cylinder.
• The normally open and normally closed valves
modulate (build/decay) the brake hydraulic pressure
as required.
• The pump/motor is switched on so that the
brake fluid from the low pressure accumulators is
returned to the master cylinder circuits.
• The brake fluid is routed to either the master
cylinder or the wheel brake depending on the posi-
tion of the normally open valve.
Fig. 17 ABS With Traction Control - ABS Braking Hydraulic Circuit
1 - OUTLET VALVE
2 - PUMP PISTON
3 - PUMP MOTOR
4 - SUCTION VALVE
5 - LOW PRESSRUE ACCUMULATOR
6 - NORMALLY CLOSED VALVE (MODULATING)
7 - TO RIGHT FRONT WHEEL
8 - NORMALLY OPEN VALVE (MODULATING)
9 - NORMALLY OPEN ASR VALVE (OFF)
10 - FROM MASTER CYLINDER
11 - HYDRAULIC SHUTTLE VALVE
12 - NOISE DAMPER CHAMBER
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BRAKES - ABS
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HCU (HYDRAULIC CONTROL UNIT) (Continued)
ABS TRACTION CONTROL HYDRAULIC CIRCUIT,
SOLENOID VALVE, AND SHUTTLE VALVE
FUNCTION (ABS WITH TRACTION CONTROL)
The hydraulic diagram (Fig. 18) shows the vehicle
in the traction control (TC) mode. The diagram shows
a drive wheel is spinning and brake pressure is
required to reduce its speed.
• The normally open TC (ASR) valve is energized
to isolate the brake fluid being pumped from the
master cylinder and to isolate the driven wheel.
• The normally open TC (ASR) valve bypasses the
pump output back to the master cylinder at a fixed
pressure setting.
• The normally open and normally closed valves
modulate
(build/decay)
the
brake
pressure
as
required to the spinning wheel.
Fig. 18 Traction Control Hydraulic Circuit
1 - OUTLET VALVE
2 - PUMP PISTON
3 - PUMP MOTOR (ON)
4 - LOW PRESSURE ACCUMULATOR PRESSURE
5 - LOW PRESSURE ACCUMULATOR
6 - NORMALLY CLOSED VALVE (MODULATING)
7 - TO RIGHT FRONT WHEEL (SPINNING)
8 - NORMALLY OPEN VALVE (MODULATING)
9 - NORMALLY OPEN TC (ASR) VALVE ON (REGULATING)
10 - FROM MASTER CYLINDER
11 - HYDRAULIC SHUTTLE VALVE
12 - CONTROLLED WHEEL PRESSURE
13 - SUCTION VALVE
14 - PUMP INTERSTAGE PRESSURE
15 - NOISE DAMPER CHAMBER
16 - MASTER CYLINDER PRESSURE
17 - PUMP PRESSURE
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BRAKES - ABS
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HCU (HYDRAULIC CONTROL UNIT) (Continued)
ICU (INTEGRATED CONTROL
UNIT)
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. 19). The ICU is located in the engine
compartment below the air cleaner housing on the
lower radiator support.
The ABS with traction control ICU consists of the
following components: the ABM, eight (build/decay)
solenoid valves (four inlet valves and four outlet
valves), two traction control solenoid valves, two
hydraulic shuttle valves, valve block, fluid accumula-
tors, a pump, and an electric pump/motor.
The replaceable components of the ICU are the
HCU and the ABM. No attempt should be made to
service any components of the HCU or ABM.
For additional information on the ABM, (Refer to 8
-
ELECTRICAL/ELECTRONIC
CONTROL
MOD-
ULES/ANTILOCK BRAKE MODULE - DESCRIP-
TION). For additional information on the HCU,
(Refer to 5 - BRAKES - ABS/HYDRAULIC/ME-
CHANICAL/HCU (HYDRAULIC CONTROL UNIT) -
DESCRIPTION).
OPERATION
For information of the ICU, refer to these individ-
ual components of the ICU:
• ANTILOCK BRAKE MODULE (ABM) (Refer to
8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES/ANTILOCK
BRAKE
MODULE
-
OPERA-
TION)
• HYDRAULIC CONTROL UNIT (HCU) (Refer to
5 - BRAKES - ABS/HYDRAULIC/MECHANICAL/
HCU (HYDRAULIC CONTROL UNIT) - OPERA-
TION)
REMOVAL
(1) Remove the remote ground cable from the
ground stud on the left strut tower.
(2) Correctly isolate remote ground cable when ser-
vicing vehicle by installing the ground cable insulator
on the strut tower ground stud. This will prevent
accidental grounding of the remote ground
cable.
(3) Using a brake pedal positioning tool (Fig. 20),
depress brake pedal past its first one inch of travel
and hold in this position. This will isolate the master
cylinder reservoir from the brake hydraulic system,
not allowing the brake fluid to drain out of the res-
ervoir.
(4) Remove the air cleaner housing. (Refer to 9 -
ENGINE/AIR
INTAKE
SYSTEM/AIR
CLEANER
HOUSING - REMOVAL)
Fig. 19 Integrated Control Unit
1 - ANTILOCK BRAKE MODULE (ABM)
2 - HYDRAULIC CONTROL UNIT (HCU)
3 - PUMP/MOTOR
Fig. 20 Brake Pedal Holding Tool Installed (Typical)
1 - CLUTCH PEDAL (IF EQUIPPED WITH MANUAL TRANSAXLE)
2 - THROTTLE PEDAL
3 - BRAKE PEDAL HOLDING TOOL
4 - STEERING WHEEL
5 - DRIVER’S SEAT
6 - BRAKE PEDAL
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BRAKES - ABS
5 - 65
(5) Clean any debris away from the fittings on top
of the ICU.
(6) Remove the two brake tubes coming from the
primary and secondary master cylinder ports at the
ICU (Fig. 21).
(7) Remove the left front chassis brake tube at the
ICU (Fig. 21).
(8) Remove the right front chassis brake tube at
the ICU (Fig. 22).
(9) Remove the rear chassis brake tubes at the
ICU (Fig. 23).
(10) Raise and support the vehicle. (Refer to
LUBRICATION
&
MAINTENANCE/HOISTING
-
STANDARD PROCEDURE)
(11) Disconnect the 47-way connector from the
antilock brake module (ABM) by depressing the tabs
on each side of the connector cover (Fig. 24), 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. 25).
Fig. 21 Primary, Secondary And Left Front Brake Tubes
1 - PRIMARY BRAKE TUBE
2 - SECONDARY BRAKE TUBE
3 - LEFT FRONT CHASSIS BRAKE TUBE
4 - ICU
Fig. 22 Right Front Chassis Brake Tube At ICU
1 - ROUTING CLIPS
2 - RIGHT FRONT CHASSIS BRAKE TUBE
3 - ICU
Fig. 23 Rear Chassis Brake Tubes At ICU
1 - ICU
2 - LEFT FRONT CHASSIS BRAKE TUBE
3 - RIGHT FRONT CHASSIS BRAKE TUBE
Fig. 24 ABM Connector Release Tabs
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BRAKES - ABS
JR
ICU (INTEGRATED CONTROL UNIT) (Continued)
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