Bendix Commercial Vehicle Systems EC-60 ESP CONTROLLERS ADV - Manual (Page 19)

19
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 ®
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 using ACom Diagnostics 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
• After an accident that may have led to damage of the
steering angle sensor or assembly
WARNING
: If the steering angle sensor is not
properly recalibrated as needed, the yaw control
system may not function properly, which can result
in a loss of vehicle control .
REMOVAL OF THE YAW RATE/LATERAL
ACCELERATION SENSOR
WARNING : Different generations of yaw rate/
lateral acceleration sensors are not compatible . Only
replace these sensors with exactly the same device .
Service Checks:
1. Check all wiring and connectors. Make sure all
connections are free from visible damage.
2. Examine the sensor. Make sure the sensor, its mounting
bolts, and the mounting bracket are not damaged.
3. Check the vent hole in underbody of sensor housing.
The vent hole should remain free from paint and debris
at all times.
Diagnostics:
The yaw rate sensor is only operational in conjunction with
an Advanced ABS ECU. No independent diagnostics can
be performed on the sensor.
Removal:
1. Unplug sensor cable assembly from body of sensor.
The connector must be twisted and pulled gently to
release.
2. In some mounting configurations, the sensor can be
removed independently from its mounting bracket.
Otherwise, remove entire assembly, then remove
sensor from bracket.
3. Take note of the direction in which the connector is
pointed.
Installation:
1. Obtain a new sensor. The sensor is not repairable in
the field.
WARNING : The location of the Yaw Rate Sensor
on the vehicle, the means of fastening the unit to the
vehicle, and the sensor's orientation, MUST NOT BE
ALTERED . When servicing, an identical component
must be used in the same orientation (using
OEM brackets & torque requirements) . During
installation, follow the OEM leveling guidelines .
If any of these requirements are not followed, the
advanced ABS control system may not function
properly, which can result in incidents leading to
loss of vehicle control .
2. Assembly yaw rate sensor housing to mounting bracket.
The bracket must be the same design as used on the
original vehicle configuration.
3. For Bendix ® YAS-60 ™ Yaw Rate Sensors, the correct
fasteners are three M8 size bolts, and the fixing torque
should be 20Nm (±2 Nm). For Bendix ® YAS-70X ™
Yaw Rate Sensors, the correct fasteners are two M10
size bolts (1.5 mm pitch angle), or OEM-supplied
hardware, and the fixing torque should be 46Nm (±9
Nm). Note that the Bendix YAS-70X sensor has two
alternate designs, one with an aligning post — see the
kit instruction sheet for more information. In all cases,
the connector should be facing in the same direction
as the removed sensor. The unit must not be installed
upside-down where there is a pressure-balancing hole.
4. The sensor should be as level as possible and parallel
to the road surface when installed on the vehicle.
5. Reconnect the connector. Ensure that there will be no
force applied to the sensor because the connector is
pulling on the sensor body.
CAUTION : When removing or installing the
sensor, care must be used to prevent damage . Do not
strike or pry the sensor . Do not use an impact tool to
install the mounting hardware .
Sensor Location Modifications
The location and orientation of the Yaw Rate Sensor must
not be altered. When servicing, an identical component
must be used in the same orientation (using OEM brackets
& torque requirements). During installation follow the OEM
leveling guidelines.
Yaw Rate Sensor Calibration:
The yaw rate sensor calibration can only be achieved via
the Advanced ABS ECU. The sensor must be recalibrated
after any of these situations:
• Replacement of the sensor
• After an accident that may have led to damage of the
yaw rate sensor
The calibration procedure is preformed using Bendix ®
ACom ® Diagnostics V4.0 or higher.
See “Troubleshooting Diagnostic Trouble Codes: Yaw Rate
Sensor” for the calibration procedure.