Intake pressure sensor failure causes and solutions

Intake pressure sensor failure causes and solutions

Inlet pressure sensor failure, there are the following. We need to understand the causes and solutions of the intake pressure sensor faults before we can solve the intake pressure sensor faults and we can better use the intake pressure sensors. To this end Xiaobian next to introduce the principle of the inlet pressure sensor failure and solutions.

1, the sensor internal circuit open circuit or short circuit;

2. The sensor output signal cannot change with the change of the vacuum degree of the intake pipe;

3, the sensor output signal voltage is too large or too small, its value deviates from the normal range;

In addition, an open circuit or short circuit in the connection line between the intake pipe pressure sensor and the computer, a blocked or leaked vacuum hose between the sensor and the intake pipe, and a vacuum hole in the intake pipe may also cause the output signal of the sensor to be abnormal.

After the above-mentioned failure occurs in the intake manifold pressure sensor, the fuel injection function of the engine computer may be abnormal, the mixture may be too rich or too lean, the engine idle operation may be abnormal or the acceleration may be poor, the intake pipe may be tempered during engine operation, or the exhaust pipe may be blackened Smoke and other phenomena.

The failures that occur when the intake manifold pressure sensor itself or the circuit is defective include: the engine cannot start, the engine does not accelerate, the engine idles unsteadily, and the engine intermittently extinguishes.

Foshan Yizhong Sensing Instrument Co., Ltd. is referred to as “Zhongzhong Sensing” and is located in Foshan, one of the fastest and most mature areas in economic and technological development in the country. It is a professional R&D, production, sales, and service of various types of pressure sensors and intelligent control. System integration of quality manufacturers. Our factory collects the advantages of similar products at home and abroad, known for anti-jamming, waterproof, anti-overload, short circuit protection and other technologies, with advanced process equipment and perfect testing methods, and strict guarantee of product manufacturing quality.

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Causes of pressure sensor failure Caused by a vacuum leak at the intake manifold, the intake manifold pressure sensor failed to obtain the correct vacuum signal; the vacuum hose leaked or fell off; the intake manifold pressure sensor hose connector was misconnected with the canister connector .

The output voltage of the pressure sensor is checked by removing the vacuum hose from the sensor and the intake manifold and allowing the sensor to communicate directly with the atmosphere. Then turn on the ignition switch, but do not start the engine. Measure the sensor output voltage at the control unit harness connector.

A vacuum is then applied to the sensor to measure the output voltage of the sensor at different vacuum levels. The voltage value should decrease as the vacuum increases. Compare the output voltage drop with the standard value. If it does not match, replace the sensor.

The pressure sensor supply voltage is checked by removing the harness connector of the intake manifold pressure sensor and turning on the ignition switch, but do not start the engine. Use a voltmeter to measure the voltage between the power terminal and the ground terminal on the harness connector. Its value should conform to the regulations, otherwise it must further check whether the line between the intake manifold pressure sensor and the electronic control unit is conducting. If there is an open circuit, replace or repair its electronic control wiring harness.

--> Intake pressure sensor failure, there are the following. We need to understand the causes and solutions of the intake pressure sensor faults before we can solve the intake pressure sensor faults and we can better use the intake pressure sensors. To this end Xiaobian next to introduce the principle of the inlet pressure sensor failure and solutions.

1, the sensor internal circuit open circuit or short circuit;

2. The sensor output signal cannot change with the change of the vacuum degree of the intake pipe;

3, the sensor output signal voltage is too large or too small, its value deviates from the normal range;

In addition, an open circuit or short circuit in the connection line between the intake pipe pressure sensor and the computer, a blocked or leaked vacuum hose between the sensor and the intake pipe, and a vacuum hole in the intake pipe may also cause the output signal of the sensor to be abnormal.

After the above-mentioned failure occurs in the intake manifold pressure sensor, the fuel injection function of the engine computer may be abnormal, the mixture may be too rich or too lean, the engine idle operation may be abnormal or the acceleration may be poor, the intake pipe may be tempered during engine operation, or the exhaust pipe may be blackened Smoke and other phenomena.

The failures that occur when the intake manifold pressure sensor itself or the circuit is defective include: the engine cannot start, the engine does not accelerate, the engine idles unsteadily, and the engine intermittently extinguishes.

Causes of pressure sensor failure Caused by a vacuum leak at the intake manifold, the intake manifold pressure sensor failed to obtain the correct vacuum signal; the vacuum hose leaked or fell off; the intake manifold pressure sensor hose connector was misconnected with the canister connector .

The output voltage of the pressure sensor is checked by removing the vacuum hose from the sensor and the intake manifold and allowing the sensor to communicate directly with the atmosphere. Then turn on the ignition switch, but do not start the engine. Measure the sensor output voltage at the control unit harness connector.

A vacuum is then applied to the sensor to measure the output voltage of the sensor at different vacuum levels. The voltage value should decrease as the vacuum increases. Compare the output voltage drop with the standard value. If it does not match, replace the sensor.

The pressure sensor supply voltage is checked by removing the harness connector of the intake manifold pressure sensor and turning on the ignition switch, but do not start the engine. Use a voltmeter to measure the voltage between the power terminal and the ground terminal on the harness connector. Its value should conform to the regulations, otherwise it must further check whether the line between the intake manifold pressure sensor and the electronic control unit is conducting. If there is an open circuit, replace or repair its electronic control wiring harness.