Table of contents: Atmospheric pressure sensor 🠇 Intake manifold pressure and…🠇
Atmospheric pressure sensor
The atmospheric pressure sensor allows the engine control unit to determine the density of the air entering the fuel injection system.
The atmospheric pressure sensor is built into the engine ECU, so it cannot be replaced separately.
Intake manifold pressure and temperature sensor
The pressure and temperature sensor in the intake manifold informs the engine control unit about the temperature of the air supplied to the cylinders.
If a fault is detected in the valve timing system, the engine ECU uses the sensor information to perform the following operations:
- determining the role of the fuel injection system ECU depending on the information received;
- determining the amount of fuel to be injected.
The intake manifold pressure and temperature sensor is a piezoresistor and is powered by 5 V.
The voltage signal sent by the sensor is proportional to the measured pressure.
The temperature sensor is a resistor with a negative temperature coefficient (CTN) resistance.
Electrical characteristics:
- resistance at 0°C - 5887 Ohm;
- resistance at 20°C - 2510 Ohm;
- resistance at 40°C - 2000 Ohm.
Purpose of connector contacts:
- pin 1: Intake air pressure sensor signal;
- pin 2: 5V power supply;
- contact 3: Air supply temperature signal;
- contact 4: "ground".