Honda Acura NSX 1991 Service Manual page 606

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 in the power unit. 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 a jumper
wire enables the EPS indicator light to blink the problem code when the ignition switch is turned on.
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 and the power unit. 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 aver-
age 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 regurates the motor current during continuous loading to sup-
press any excessive temperature rise in the power unit and the motor.
Over-Voltage Control
If there is an excessive increase in power source voltage due
problem, etc., the motor assisting force increases, resulting in excessive control. To prevent this, the control unit signals
to the power unit are corrected to ensure that adequate assisting force is generated.
to a poor 'battery condition, an alternator voltage regulator