Acura NSX 1991 Manual page 413

Main Menu
Self-Diagnosis Function
The EPS control unit monitors the system inputs and outputs, and the driving current of the motor. If there is a problem in
the system, the control unit turns the system off by actuating the relay. Power assist stops and normal manual steering
operation resumes. The control unit also turns the EPS indicator light on to alert the driver, and memorizes the problem in
the form of a code. Connecting the terminals of the service check connector with the SCS service connector (special tool)
enables the EPS indicator light to blink the problem code when the ignition switch is turned on (II).
Unloader Control
If the steering wheel is turned fully and held in the full-lock position, the steering torque reaches the maximum point, and
an over-current flows to the motor. The control unit detects this and reduces the current flow to the motor.
Average Moving Current Control
The electric current flow to the motor is estimated from the current values detected by the current sensor, and the average
current is obtained at two second intervals. The motor driving current is suppressed when the average current value
exceeds a predetermined marginal value. The control unit regulates the motor current during continuous loading to sup-
press any excessive temperature rise in the motor.
Over-Voltage Control
If there is an excessive increase in power source voltage due to a poor battery condition, an alternator voltage regulator
problem, etc., the motor assisting force increases, resulting in excessive control. To prevent this, the control signals are
corrected to ensure that adequate assisting force is generated.
Table of Contents