Steering Angle Sensor

The steering angle sensor measures the steering wheel angle, and the rate of steering wheel angle speed. The measurements are output on the high speed CAN bus together with a quality factor signal, and are used by the ABS module and the rear differential control module for ARM, 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. A multipin electrical connector provides the interface between the vehicle wiring and integrated circuits in the steering angle sensor.

The steering angle sensor operates with the MR (magneto resistive) effect to evaluate the direction of magnetic fields, and measure the angular position of the lower shaft to provide the steering wheel angle. When the steering wheel turns, the steering column lower shaft rotates the gear wheel within the steering angle sensor. The gear wheel drives the gear train and rotates the magnets located on the gears. The direction of the magnetic field is constantly monitored by the steering angle sensor and is 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 is between 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 DTC. At the beginning of each ignition cycle the quality factor signal is reset to 'within specified accuracy'.

The status of the steering angle sensor is able to be determined using Land Rover approved diagnostic equipment.

If the steering angle sensor is renewed, the new sensor must be calibrated using Land Rover approved diagnostic equipment. 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.