intake manifold pressure sensor, a D type, i.e. extremely important speed density type fuel injection system, the sensor type, plays converting pressure changes within the intake manifold into a voltage signal role. Control computer (ECU) according to the engine speed signal and (the signal provided by the engine speed sensor installed in the distributor) to determine the amount of air entering the cylinder.
1 intake manifold pressure sensor structure
Since the manifold internal pressure sensor has an amplifier circuit, it needs power supply line, ground line and the signal output line consists of three wires, which correspondingly there are three terminals on the terminal block, respectively, a power supply terminal (Vcc), a ground terminal (E) and output signal terminals (the PIM), three terminals connected by a wire connector and the lead and control the computer ECU.
In order to reduce the intake manifold pressure sensor inside a vibrating tube electronic components, it is usually installed in a relatively small vibration of the vehicle position, and located above the intake manifold, to prevent from the intake manifold blow-invasive pressure sensors. Also the intake manifold pressure sensor from below is prevented from receiving the intake pipe pressure signal of the sensor section does notContaminated, and therefore, a gas pipe near the intake throttle duct spaces acquired from the intake manifold through a rubber tube, is accessible from the lower manifold pressure sensor. When
2. monomer detector
1. Appearance View
Now, a throttle valve near the end of the tube just to find a rubber hose from the intake manifold, the car can be found on a manifold pressure sensor. First, in the closed state of the ignition lock, the connection check intake manifold pressure sensor wire connector is good, rubber hose is detached. Then start the engine, see the rubber hoses for sealing leakage and air leaks.
2, meter test
(1) the ignition switch is turned on (ON position), the voltage between the measurement terminal Vcc and a DC voltage block E2 multimeter (DCV-20) the ECU is the voltage applied on the supply voltage value of the manifold pressure sensor, which should be normal: between 4.5 ~ 5.5V, if the value is incorrect, check the connection between the battery voltage or the wire, sometimes the problem is also likely in the ECU control computer.
(2) the ignition switch is turned on (ON position), and remove the rubber hose from the vacuum intake manifold pressure sensor, the intake port to the atmosphere an intake manifold pressure sensor, this when the test voltage signal output terminals (the voltage between ground and E2 of PIM), which is a normal value: between 3.3 ~ 3.9V, if the output voltage is too high or too low, both indicate the intake manifold pressure sensor fault and should be replaced.
(3) the ignition switch is turned on (ON position), remove the intakeVacuum rubber hose from a manifold pressure sensor, the sensor at the inlet with a hand vacuum pump to different manifold pressure applied negative pressure (vacuum), pressure side edge test signal voltage input terminal E2 and ground of PIM between voltage value. The voltage value should increase with the applied negative pressure increases linearly, otherwise, indicating the signal detection circuit within the sensor is faulty and should be replaced.