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chevy blazer fuel sender reading vs gauge level
chevy blazer fuel sender reading vs gauge level:
Total fuel: The mark lights up for the first time, representing about 8L of fuel left. If there is a problem with the fuel system software, it will also cause the fault indicator to light up.
Engine oil quantity: The oil pressure is too low or the remaining oil is insufficient.
Motor control driving stability system software (ESP): Flashes when everything is running normally, lights up when there is a problem, and lights up when the function is turned off. The motor-controlled driving stability system: The indicator light on may be due to insufficient fuel ignition, or it may be a common fault of the three-way catalytic converter, causing industrial exhaust gas to fail to meet the requirements.
The key of the vehicle is set to the ON position, and the fuel level indicator on the instrument shows a deviation when filling up the gasoline, and the pointer of the fuel gauge will go down during normal driving, and the pointer of the fuel level will go up when parking and idling. First, check the power line to the fuel level sensor. The voltage is 12V, which is normal; The reference voltage from the engine control module is 5V, normal; Then remove the oil pump assembly for inspection, and connect the power supply voltage to measure the output voltage of its liquid level sensor. It is a continuous variable voltage, which is also normal. First, the signal of high and low fuel level is transmitted to the instrument through the engine control module; Second, the engine control module judges the level of the fuel level by detecting the potential on the No. 3 wire; Third, the float slip resistance on the liquid level position sensor shares 12V power with the oil pump motor. Combined with the fault phenomenon described by the owner, the pointer of the fuel gauge will go down during the normal driving process, and the pointer of the fuel level will go down during the idling operation. It can be judged that the fluctuation of the working voltage of the oil pump under different working conditions will cause the fluctuation of the float signal voltage, which may cause the instability of the float voltage, leading to the deviation of the feedback signal. Under the condition of not affecting the normal operation of other components, combined with their own experience, it is decided to make certain changes to their lines to achieve the purpose of troubleshooting. According to the working principle of the fuel level, the fuel level will not change until the ignition key is turned on. As long as the 12V power supply of the float is properly handled, the fault can be eliminated.
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