Five line air flow meter | What happens to the car if the absolute pressure sensor of the intake manifold is broken

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1. How to wire the Toyota Corolla five wire air flow meter?

1. Connect the first wire (power line) to the positive pole of the power supply, usually a 12V power line. Huailu

2. Connect the second wire (grounding wire) to the negative pole of the power supply or the grounding point of the vehicle body to ensure good grounding.

3、 The third wire (signal wire) is connected to the corresponding interface of the car computer (ECU) or fuel injection system.

4、 The fourth wire (temperature compensation wire) is connected to the temperature sensor, usually located next to the air filter, and the macro leak is used to compensate for the impact of air temperature on the flow meter. 5. The fifth wire (sensing wire) is connected to the sensing device or sensor of the air flow meter and is usually installed on the flowmeter body.

2. How to repair the car air flow meter? The ECU of the electronic control fuel injection system has a fault storage function, which summarizes the working conditions of various sensors and actuators and compares them with fixed programs stored in the computer. If the error exceeds the specified range, it will be treated as a fault storage. Maintenance personnel can know the specific fault situation through a fault reader (detector). There is a similar fault resolution situation, such as a contradiction between the air flow meter signal and the oxygen sensor signal. How will the computer output it? Fault 1: The Jetta 20V engine has unstable idle, weak driving, and black smoke. After a basic troubleshooting, it recurred a few days later. Testing process: The computer displayed a temporary malfunction in the air flow meter. Despite replacing the air flow meter, the malfunction persisted. Using the V.A.G1551 fault diagnosis instrument, the entire vehicle data block was tested and found to be normal. However, during the specific testing of the air flow meter circuit, it was found that the resistance value of the air flow meter signal line was too high, with a normal value of 0.5 Ω and an actual value of 3.6 Ω. The real reason is that there is a virtual connection in the circuit. After handling the wiring harness plug, the fault was eliminated. Fault analysis: This type of fault belongs to a special fault, but it is often encountered in actual maintenance and relatively difficult to solve. At that time, we found a problem: the signal line of the air flow meter is located at the corner of the plug, which is prone to position failure during the production process, resulting in poor contact. In other plugs, the corresponding positions are also worth our attention. In addition, as a crucial component, the failure rate of the air flow meter is very low. When the computer prompts for its failure, we should be cautious. Fault 2: Jetta 20V has unstable idle speed, emitting black smoke under partial load, and sometimes stalling during gear shifting. Detection process: The fault stored in the computer is an air flow meter fault, but the specific detection of the air flow meter circuit shows that the situation is normal. The fault still persists after replacing the air flow meter. After replacing the computer, the cold car works normally, but the fault still persists after heating the car. At this point (using the V.A.G1551 fault diagnosis instrument), the entire vehicle data block was checked again, and it was found that the voltage change frequency of the oxygen sensor in the 7th group and 2n

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