Bosch DSC 3.X User Manual download pdf (Page 15)

Rotation Rate Sensor Signals

The DSC III control module provides the rotation rate sensor with 12 volts operating power

and ground. In return, the sensor provides:

• A standing 2.5 volt reference voltage signal (pin 4 of sensor)

• A linear voltage signal ranging from 0.7 to 4.3 volts (pin 3 of sensor)

The linear voltage equates to a range of -50

(.7V) to +50

(4.3V) vehicle rotation rate

change per second. The DSC III control module monitors the signal voltage every 20ms.

In conjunction with the steering angle, front wheel speeds and lateral forces, the rotation

rate signal provides confirmation of a vehicle pushing the limits of acceptable yaw. The

DSC III control module then regulates the torque output of the vehicle and manipulates the

brake system hydraulics as needed to correct for the under/oversteer condition.

For continual plausibility testing, the DSC control module send a predetermined test volt-

age signal to the rotation rate sensor (pin 5 of sensor). The sensor calculates the voltage

value and sends feedback to the DSC III control module over the signal line (pin 2) every

other 20ms signal cycle. If the feedback is out of plausible range the DSC III module sets

a fault.

The DSC III module also checks the actual signal for plausibility by comparing it to com-

bined signals from the front wheel speed sensors, lateral acceleration sensor and the steer-

ing angle signal from the CAN bus.

Sensor Replacement

If the rotation rate sensor is replaced, the new sensor must be calibrated with the DSC III

control module through the Service Function Menu of the Diagnosis program using the

DISplus or GT-1.

Introduction to DSC

DSC III

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Bosch DSC 3.X User Manual Page 15