The throttle position sensor is mounted in the throttle body
and detects the throttle valve opening angle. When the
throttle valve is fully closed, the IDL contacts in the throttle
position sensor are on, so the voltage at the terminal IDL
of the ECM become 0V. At this time, a voltage of approximately 0.7 V is applied to the terminal VTA of the ECM.
When the throttle valve is opened, the IDL contacts go off
and thus the power source voltage of approximately 12 V
in the ECM is applied to the terminal IDL of the ECM. The
voltage applied to the terminal VTA of the throttle valve and
becomes approximately 3.2 – 4.9 V when the throttle valve
is fully opened. The ECM judges the vehicle driving conditions from these signals input from the terminals VTA and
IDL, and uses them as one of the conditions for deciding
the air–fuel ratio correction, power increase correction, fuel
cut control etc. The sub throttle position sensor is built and
operates in the same way as the main throttle position sensor. This sensor is used for traction control. The sub–
throttle valve is opened and closed by the sub–throttle actuator according to the signals from the TRAC ECU to
control the engine output