Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual - part 296

INSTALLATION

INSTALLATION - JR27

CAUTION: Proper installation of wheel speed sen-
sor harness is critical to continued system opera-
tion. Be sure that harness is installed properly to
avoid harness contact with moving parts or over-
extension, resulting in an open circuit.

(1) Install speed sensor head into brake adapter

(Fig. 11). Install bolt through routing clip and secure
wheel speed sensor in place. Tighten bolt to 8 N·m
(75 in. lbs.)

(2) Install speed sensor harness routing clip on

upper control arm. Install and securely tighten the
routing clip attaching bolt.

(3) Install connector end of speed sensor harness

through hole at frame rail.

(4) Install speed sensor harness sealing grommet

into hole. Install the sealing grommet retainer and
attaching bolt (Fig. 10). Securely tighten retainer
attaching bolt.

(5) Lower vehicle.
(6) Connect speed sensor harness connector to

vehicle wiring harness (Fig. 9).

(7) Install foam sleeve back over the speed sensor

harness connection to prevent rattling (Fig. 8).

(8) Slide the sensor harness connector back behind

the wheel house silencer (Fig. 7).

(9) Lay the main silencer pad back into its normal

place.

(10) Install the rear seat back and cushion. (Refer

to 23 - BODY/SEATS/REAR SEAT BACK - INSTAL-
LATION)

(11) Road test vehicle to ensure proper operation of

the base and ABS systems.

INSTALLATION - JR41

(1) Install speed sensor head into brake adapter

(Fig. 11). Install bolt through routing clip and secure
wheel speed sensor in place. Tighten bolt to 8 N·m
(75 in. lbs.)

(2) Install speed sensor harness routing clip on

upper control arm. Install and securely tighten the
routing clip attaching bolt.

(3) Install connector end of speed sensor harness

through hole at frame rail.

(4) Install speed sensor harness sealing grommet

into hole. Install the sealing grommet retainer and

attaching bolt (Fig. 10). Securely tighten retainer
attaching bolt.

(5) Install the tire and wheel assembly on vehicle.
(6) Lower vehicle.
(7) Connect speed sensor harness connector to

vehicle wiring harness behind rear seat back. Install
sleeve back over the speed sensor harness con-
nection to prevent rattling.

(8) Road test vehicle to ensure proper operation of

the base and ABS systems.

TONE WHEEL

INSPECTION - TONE WHEEL

Tone wheels can cause erratic wheel speed sensor

signals. Inspect tone wheels for the following possible
causes.

• missing, chipped, or broken teeth

• contact with the wheel speed sensor

• wheel speed sensor to tone wheel alignment

• wheel speed sensor to tone wheel clearance

• excessive tone wheel runout

• tone wheel loose on its mounting surface
If a front tone wheel is found to need replacement,

the drive shaft must be replaced. No attempt should
be made to replace just the tone wheel. (Refer to 3 -
DIFFERENTIAL & DRIVELINE/HALF SHAFT -
REMOVAL)

If a rear tone wheel is found to need replacement,

the tone wheel is incorportaed into the hub and bear-
ing assembly and the hub and bearing must be
replaced. (Refer to 2 - SUSPENSION/REAR/HUB /
BEARING - REMOVAL)

If wheel speed sensor to tone wheel contact is evi-

dent, determine the cause and correct it before
replacing the wheel speed sensor or tone wheel.

Check the gap between the speed sensor head and

the tone wheel to ensure it is within specifications.
(Refer to 5 - BRAKES - ABS/ELECTRICAL - SPEC-
IFICATIONS)

Excessive wheel speed sensor runout can cause

erratic wheel speed sensor signals. Refer to SPECI-
FICATIONS in this section of the service manual for
the maximum allowed tone wheel runout (Refer to 5 -
BRAKES - ABS/ELECTRICAL - SPECIFICATIONS).
If tone wheel runout is excessive, determine if it is
caused by a defect in the driveshaft assembly or hub
and bearing. Replace as necessary.

Tone wheels are pressed onto their mounting sur-

faces and should not rotate independently from the
mounting surface. Replacement of the front drive-
shaft or rear hub and bearing is necessary.

BRAKES - ABS

5 - 59

REAR WHEEL SPEED SENSOR (Continued)

TRACTION CONTROL SWITCH

REMOVAL

NOTE: Before proceeding, review all WARNINGS
and CAUTIONS. (Refer to 19 - STEERING/COLUMN -
WARNING) (Refer to 19 - STEERING/COLUMN -
CAUTION)

(1) Open hood and remove remote ground cable

from ground stud on left front shock tower. Isolate
ground cable from vehicle by installing cable isolator
on ground stud (Fig. 12).

(2) Remove instrument panel trim bolster below

steering column. (Refer to 23 - BODY/INSTRUMENT
PANEL/INSTRUMENT PANEL TRIM - REMOVAL)

(3) Disconnect traction control “OFF” switch wir-

ing connector at column harness.

(4) Remove 2 screws attaching upper and lower

shrouds to steering column (Fig. 13).

(5) Remove upper shroud (with switch) from steer-

ing column by pressing inward on upper shroud just
above the parting line while pulling upper and lower
shrouds apart.

(6) Release tilt lever and tilt steering column to its

highest point, then remove lower shroud from steer-
ing column.

(7) Disengage retaining tab and remove traction

control “OFF” switch from upper shroud (Fig. 14).

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 steer-

ing column. (Refer to 23 - BODY/INSTRUMENT PAN-
EL/INSTRUMENT PANEL TRIM - INSTALLATION)

(5) Connect remote ground cable to ground stud on

left front shock tower.

(6) Close hood.
(7) Connect DRBIII

t scan tool to diagnostic data

link connector and check for any faults.

(8) Road test vehicle checking operation of traction

control and switch.

Fig. 12 Correctly Isolated Remote Ground Cable

1 - LEFT STRUT TOWER
2 - GROUND STUD

Fig. 13 Steering Wheel And Shroud Mounting

1 - UPPER SHROUD
2 - BOLT
3 - STEERING WHEEL
4 - LOWER SHROUD

Fig. 14 Traction Control Switch

1 - UPPER SHROUD
2 - TRACTION CONTROL

OFF

SWITCH

5 - 60

BRAKES - ABS

HCU (HYDRAULIC CONTROL
UNIT)

DESCRIPTION

The hydraulic control unit (HCU) is mounted to

the ABM as part of the ICU (Fig. 15). 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.

Fig. 15 Integrated Control Unit

1 - ANTILOCK BRAKE MODULE (ABM)
2 - HYDRAULIC CONTROL UNIT (HCU)
3 - PUMP/MOTOR

BRAKES - ABS

5 - 61

NORMAL BRAKING HYDRAULIC CIRCUIT,
SOLENOID VALVE, AND SHUTTLE VALVE
FUNCTION (ABS WITH TRACTION CONTROL)

The hydraulic diagram (Fig. 16) shows a vehicle

with traction control in the normal braking mode.
The diagram shows no wheel spin or slip occurring
relative to the speed of the vehicle. The driver is
applying the brake pedal which builds pressure in
the brake hydraulic system to engage the brakes and
stop the vehicle. The hydraulic shuttle valve closes
with every brake pedal application so pressure is not
created at the inlet to the pump/motor.

Fig. 16 ABS With Traction Control - Normal Braking Hydraulic Circuit

1 - OUTLET VALVE
2 - PUMP PISTON
3 - PUMP MOTOR (OFF)
4 - SUCTION VALVE
5 - LOW PRESSURE ACCUMULATOR
6 - NORMALLY CLOSED VALVE (OFF)
7 - TO RIGHT FRONT WHEEL

8 - NORMALLY OPEN VALVE (OFF)
9 - NORMALLY OPEN TC (ASR) VALVE (OFF)
10 - FROM MASTER CYLINDER
11 - HYDRAULIC SHUTTLE VALVE
12 - MASTER CYLINDER PRESSURE
13 - NOISE DAMPER CHAMBER

5 - 62

BRAKES - ABS

HCU (HYDRAULIC CONTROL UNIT) (Continued)

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