Honda Acura NSX 1991 Service Manual page 764

Fail-Safe Function:
If the control unit detects an abnormality, it shuts the
traction control system off and causes the TCS system
indicator light to come on. However if the abnormality
is detected while the TCS is activated, the control first
establishes the appropriate wheel spin velocity, then
shuts the system down, thus preventing excessive wheel
spin.
Self-Diagnosis Function:
If the control unit detects an abnormality, it records a
"problem code" which can be used to diagnose the
problem. The failure code is shown at the TCS system
indicator light when the Service Check connector termi-
nals are connected with a jumper wire.
Steering Angle Detection
Steering angle is detected by the steering angle sensor,
located on the steering column. The sensor uses two
magnetoresistor elements to
and direction of rotation. When the driver turns the steer-
ing wheel, a magnet in the steering shaft generates
waves in the "MR" elements. These waves are ampli-
fied and converted into signals which the control unit can
interpret as angle and direction of turn.
Vehicle Speed Detection
Wheel rotation speed is detected by the wheel sensors,
located at each wheel. The signals are sent to the con-
trol unit, which compares each wheel's speed and de-
termines whether traction control is required.
determine steering angle
TCS SYSTEM INDICATOR
M R
E L E M E N T o
'WHEEL
GEAR PULSER