Service manual

Fuel Injection System 7
78
Fig. 2-34, Electric circuits of an intake temperature sensor
③ To inspect the absolute pressures (KPa) of intake air, the intake pressure sensor connects the throttle
body’s main duct via a pressure duct of the throttle body. The sensor is divided into the two parts: sensing
element and detection circuits as shown in Fig. 2-35.
Fig. 2-35, Intake pressure sensor
The output voltages from the pressure chip will proportionally vary with changes in the main duct’s
pressures and be forwarded to ECU for detection of the absolute pressures in the duct.
④ Throttle position sensor
As one angle sensor for linear output, this sensor is composed of two curved slide resistors and two contact
sliders. The contact slider has its spindle connected to and aligned with the throttle body’s axle. The
voltage of 5V, U
S
, is applied to the slide resistor’s both ends. With the throttle turning, the contact sliders
also turn and move on contact sliders for output of U
P
at any contact. Therefore, the sensor is also a
potentiometer for output of angles.