SECTION 12: BRAKE AND AIR SYSTEM
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
31
DANGER
Bendix ESC system may reduce the vehicle
speed automatically
.
ESC can make the vehicle
decelerate
automatically.
ESC can slow the vehicle with
or
without the operator applying the brake,
and
even when the throttle is being applied.
30.4 BENDIX
®
SAS-70 STEERING ANGLE
SENSOR
The Steering Angle Sensor (SAS) is used to
provide driver steering input to the controller. It
reports the steering wheel position to the
controller utilizing a dedicated serial communica-
tions link that is shared with the YAS-70 sensor.
The controller supplies the power and ground
inputs to the SAS-70
sensor.
The SAS-70
sensor installed on Prevost vehicles
is the 90° connector.
30.4.1 Removal of the steering angle sensor
Service Checks:
1. Check all wiring and connectors. Some
installations also include an intermediate
connector from the steering angle sensor to
the main vehicle wire harness. Make sure all
connections are free from visible damage.
2. Examine the sensor. Make sure the sensor,
its mounting screws, and the interface
between the hub and the steering column
are not damaged.
Diagnostics:
The steering angle sensor is only operational in
conjunction with an Advanced ECU. No
independent diagnostics can be performed on
the sensor.
Removal:
1. Remove steering column upper, middle and
lower covers.
2. The steering angle sensor is located near
the universal joint.
3. Unplug sensor cable assembly from body of
sensor. Squeeze the mounting tabs and pull
gently on connector until it disengages.
4. Disconnect steering column upper U-joint.
5. Unscrew all three of the mounting screws
that hold the body of the sensor to the
steering column body.
6. Slide the sensor over the column to remove.
Take note if the sensor label is facing up-
ward or downward.
Installation:
1. Obtain a new sensor. The sensor is not
repairable in the field.
2. Slide the sensor over the column. The
center hub of the sensor must be aligned
with the corresponding notch in the column.
The sensor label should be facing in the
same direction as the removed sensor.
3. Reconnect the steering column U-joint.
4. Assemble the column non-moving plate with
three self-locking screws.
5. Tighten screws between 48 lbf-ft (65 Nm)
and 74 lbf-ft (100 Nm).
6. Reconnect the connector. Ensure that there
will be no force applied to the sensor
because the connector is pulling on the
sensor body.
7. If the wire harness leading to the sensor is
being replaced, ensure that it is adequately
tie wrapped so that the full motion of the
steering column can be achieved without
pulling apart the connectors.
8. Reinstall the steering column covers. The
sensor is not protected against dirt or water
intrusion, so care must be taken not to
introduce these elements during installation.
Steering Angle Sensor Calibration
The steering angle sensor calibration can only
be achieved when the sensor is powered by the
Advanced ABS ECU. No stand-alone sensor
calibration can be carried out. The calibration
procedure is performed using Bendix
®
ACom
TM
Diagnostic V4.0 or higher. See “Troubleshooting
Diagnostic Trouble Codes: Steering Angle
Sensor (SAS-60)” for the calibration procedure
using this tool.
The sensor
must
be recalibrated after any of
these situations:
Replacement of the steering angle sensor;
Any opening of the connector hub from the
steering angle sensor to the column;
Any maintenance or repair work on the
steering linkage, steering gear or other
related mechanism;
Adjustment of the wheel alignment or wheel
track;
