Acura NSX 1997 Service Manual page 230

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Drive By Wire System
System Description (cont'd)
Cruise Control Function
The ECM controls the throttle valve control motor to maintain the set speed when the cruise control system is operating.
The throttle valve control motor takes the place of the cruise control actuator.
Traction Control System (TCS) Function
If wheel spin occurs during acceleration or cornering, the TCS control unit requests the ECM to reduce the engine power
by retarding the ignition timing and closing the throttle valve. If the wheels lock during deceleration, the TCS control unit
signals the ECM to open the throttle valve.
Engine Protection Function
When the engine speed exceeds 8,000 rpm (M/T) or 7,500 rpm (A/T), the ECM controls the throttle valve, regardless of the
accelerator position, to protect the engine from over-revving.
Fail-safe Function
On this system, the ECM monitors the position of the accelerator pedal with a dual circuit type accelerator position sensor,
and monitors the operation of the throttle valve control motor with a Throttle Position (TP) sensor.
When an abnormality occurs in the system, the ECM restricts the operation of the throttle valve control motor to allow the
engine to continue to run.
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