Honda Acura NSX 1991 Service Manual page 51

The control system for this mechanism, as shown below, constantly monitors the changes in engine status such as load,
rpm and vehicle speed. This information is transmitted to the Control Unit.
Valve Timing Change Conditions
Engine RPM:
Vehicle Speed: 5 km/h (3 MPH) or faster
Water Temperature: 60°C (140°F) or higher
Control System
t
from
OIL PUMP -
SOLENOID VALVE (SPOOL VALVE)
temp
W a t e r
I