A vehicle steering control system is provided which is capable of reliably
protecting a motor for driving a wheel steering shaft. The offset output
characteristic of a current sensor for detecting the electric current
applied to the steering shaft drive motor is actually measured prior to
the actual use of the steering control system, and offset compensation
information is prepared based on the measured value of the offset output
characteristic for storage in an EEPROM. Further, an output value of the
current sensor and an output value of a reference current measuring system
are measured independently of each other with the supply voltage for use
in measurement being set to a constant value. Then, current gain
compensation information is prepared based on the output values so
measured and is stored in the EEPROM. In the later actual use (i.e., after
shipment) of the control system, the output of the current sensor is
compensated based on the offset compensation information and the current
gain compensation information.
