Identification and Detection of Semiconductor Varistor-type Intake Air Pressure Sensor 3

Figure 3 Connection circuit between intake manifold pressure sensor and ECU

Figure 4 shows the connection diagram between the pressure-sensitive resistor intake manifold pressure sensor used by General Motors and the ECU (computer). The testing should be carried out according to the following steps.diode

① Measure the power supply voltage with a multimeter. When the ignition switch is turned on, the voltage between the C terminal of the power cord and the A terminal of the grounding wire should be 5V, indicating that the ECU (computer) power supply is normal.diode

Figure 4 Connection circuit between General Motors intake manifold pressure sensor and computer (ECU)

② Measure the signal voltage with a multimeter. Turn on the ignition switch, the voltage between terminal B and terminal A should be 4V; when starting the engine and idling, the voltage between terminal B and terminal A should be 1-1.5V; gradually increase the throttle, the engine speed increases, and the voltage should gradually increase to 5V.diode

(3) Detection of Santana 2000GLi Automotive Manifold Pressure Sensor

The intake manifold pressure sensor and intake temperature sensor used in the Santana 2000GLi sedan are integrated and installed on the power chamber of the intake system. Its appearance is shown in Figure 5. The sensor connector has four connection terminals connected to the ECU, and its connection circuit diode