LR3/Disco 3
The steering angle sensor measures the steering wheel angle and the rate of change of the steering wheel angle (known
as the steering wheel angle speed). These measurements are output on the high speed CAN bus, together with a quality
factor signal, and used by the ABS module for CBC and DSC operation.
The steering angle sensor is fixed to the pivot bracket of the steering column by three screws. A gear wheel in the
steering angle sensor engages with a plastic drive collar fixed onto the lower shaft of the column. Inside the steering
angle sensor, the gear wheel meshes with a gear train containing magnets. An eight pin electrical connector provides the
interface between the vehicle wiring and integrated circuits in the steering angle sensor.
The steering angle sensor uses the Magneto Resistive (MR) effect, which evaluates the direction of magnetic fields, to
measure the angular position of the lower shaft, and thus the steering wheel angle. When the steering wheel turns, the
steering column lower shaft rotates the gear wheel in the steering angle sensor, which drives the gear train and rotates
the magnets on the gears. The direction of the magnetic fields is constantly monitored by the steering angle sensor and
converted into a steering wheel angle and steering wheel angle speed.
The steering angle sensor performs a plausibility check of the steering wheel angle each time the following conditions co-
exist:
The vehicle is traveling in a straight line.
The vehicle speed is between 20 and 25 km/h (12.5 and 15.6 mph).
The transfer box is in high range.
The brake pedal is not pressed.
There is no ABS, DSC or ETC activity.
The steering angle sensor uses inputs of wheel speed, yaw rate and lateral acceleration to determine when the vehicle is
traveling in a straight line. When all of the conditions co-exist, the steering angle sensor checks the steering angle, which
should be 0 ± 15°. If the steering angle is outside the limits on two successive checks, the steering angle sensor changes
the quality factor signal to 'outside specification' for the remainder of the ignition cycle and stores a fault code. At the
beginning of each ignition cycle the quality factor signal is reset to 'within specified accuracy'.
The status of the steering angle sensor can be determined using T4.
If the steering angle sensor is replaced, the new sensor must be calibrated using T4. The steering angle sensor must also
be re-calibrated any time it is disturbed from the steering column, or if the upper and lower steering columns are
separated.
Steering Angle Sensor Harness Connector C0862
Item Part Number
Description
1
-
Gear wheel
2
-
Electrical connector
