Dodge Durango (HB). Manual — part 124
SENSOR-WHEEL SPEED-ABS-FRONT
OPERATION
The Wheel Speed Sensor consists of a magnet (1)
surrounded by windings from a single strand of wire
(5). The sensor sends a small AC signal to the ABM.
This signal is generated by magnetic induction. The
magnetic induction is created when a toothed sensor
ring (exciter ring or tone wheel) (4) passes the station-
ary magnetic WSS.
When the ring gear is rotated, the exciter ring (4)
passes the tip of the WSS. As the exciter ring tooth
approaches the tip of the WSS, the magnetic lines of
force expand, causing the magnetic field to cut across
the sensor’s windings (5). This, in turn causes current
to flow through the WSS circuit in one direction. When
the exciter ring tooth moves away from the sensor tip,
the magnetic lines of force collapse cutting the wind-
ing in the opposite direction. This causes the current
to flow in the opposite direction. Every time a tooth of
the exciter ring passes the tip of the WSS, an AC sig-
nal is generated current. Each AC signal (positive to
negative signal or squarewave) is interpreted by the
ABM. It then compares the frequency of the sinewave
to a time value to calculate vehicle speed. The ABM
continues to monitor the frequency to determine a
deceleration rate that would indicate a possible wheel-
locking tendency.
The signal strength of any magnetic induction sensor is directly affected by:
•
Magnetic field strength; the stronger the magnetic field, the stronger the signal
•
Number of windings in the sensor; more windings provide a stronger signal
•
Exciter ring speed; the faster the exciter ring/tone wheel rotates, the stronger the signal will be
•
Distance (3) “air gap” between the exciter ring teeth and WSS; the closer the WSS is to the exciter ring/tone
wheel, the stronger the signal will be.
The WSS is not adjustable. A clearance specification has been established for manufacturing tolerances. If the
clearance is not within these specifications, then either the WSS or other components may be damaged. The clear-
ance between the WSS and the exciter ring is 0.005 – 0.050 in.
The assembly plant performs a “Rolls Test” on every vehicle that leaves the assembly plant. One of the test per-
formed is a test of the WSS. To properly test the sensor, the assembly plant connects test equipment to the Data
Link Connector (DLC). This connector is located to the right of the steering column and attached to the lower portion
of the instrument panel. The rolls test terminal is spliced to the WSS circuit. The vehicle is then driven on a set of
rollers and the WSS output is monitored for proper operation.
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BRAKES - ABS SERVICE INFORMATION
5 - 275
REMOVAL
1. Remove the front rotor (Refer to 5 - BRAKES/HY-
DRAULIC/MECHANICAL/ROTORS - REMOVAL).
2. Remove the wheel speed sensor mounting bolt (1)
from the hub (3).
3. Remove the wheel speed sensor (2) from the hub
(3).
4. Remove the wiring from the clips and disconnect
the electrical connector.
INSTALLATION
1. Install the wiring to the clips and Reconnect the
electrical connector.
2. Install the wheel speed sensor (2) to the hub (3).
3. Install the wheel speed sensor mounting bolt (1) to
the hub (3). Tighten the bolt to 21 N·m (190 in.
lbs.).
4. Install the front rotor and brake caliper assembly
(Refer to 5 - BRAKES/HYDRAULIC/MECHANICAL/
ROTORS - INSTALLATION).
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BRAKES - ABS SERVICE INFORMATION
HB
SENSOR-WHEEL SPEED-ABS-REAR
REMOVAL
WITH TRACTION CONTROL
1. Raise the vehicle on a hoist.
2. Disconnect the wheel speed sensor electrical con-
nector (3).
3. Remove the mounting bolt (1) from the sensor (4).
4. Remove the sensor (4) from the brake caliper
adapter (2).
WITHOUT TRACTION CONTROL
1. Raise the vehicle on a hoist.
2. Disconnect the sensor wire harness.
3. Remove the brake line mounting nut and remove
the brake line from the sensor stud (2).
4. Remove the mounting stud (2) from the sensor (1)
and shield.
5. Remove the sensor (1) and shield from the differ-
ential housing (3).
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BRAKES - ABS SERVICE INFORMATION
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INSTALLATION
WITH TRACTION CONTROL
1. Insert the wheel speed sensor (4) in the brake cal-
iper adapter (2).
2. Install the sensor mounting bolt (1) and tighten to
24 N·m (200 in. lbs.).
3. Reconnect the electrical wiring connector (3) to the
sensor (4).
4. Lower the vehicle.
WITHOUT TRACTION CONTROL
1. Install the O-ring on the sensor (1) (if removed).
2. Insert the sensor (1) in the differential housing (3).
3. Install the sensor shield.
4. Install the sensor mounting stud (2) and tighten to
24 N·m (200 in. lbs.).
5. Install the brake line on the sensor stud (2) and
install the nut.
6. Connect the harness to the sensor. Be sure the
seal is securely in place between the sensor
and the wiring connector.
7. Lower the vehicle.
SENSOR-G
DESCRIPTION
4X4 WITHOUT TRACTION CONTROL
The G-sensor is located inside the ABS controller. The sensor is not a separate serviceable part from the antilock
brake module (ABM).
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BRAKES - ABS SERVICE INFORMATION
HB
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