Why does a car crankshaft position sensor start a car without a 5V voltage?

This is because there is also a camshaft position sensor, and the engine start signal can also be activated.

Originally, the signal voltage was not 5V, and 5V was the ECU power supply voltage. If the crankshaft position sensor is damaged, there is also a camshaft position sensor, and the car can be started and can be driven. If there is no camshaft position sensor, it can be started according to the engine start signal, and it can idle normally, but there is no speed signal, and the oil supply does not increase.

The engine will accelerate to force, and the load will accelerate and stall.

The car starts with a motor (motor), as long as the voltage on the motor is enough, it can be started and it has nothing to do with the crankshaft 5V.

1.I don't know what type of crankshaft position sensor you are talking about, whether it is Hall, magnetoelectric or photoelectric. If it is a magnetoelectric crankshaft position sensor, there is no 5V voltage, this crankshaft position sensor has only two wires, and Hall-type and photoelectric crankshaft position sensors will have a reference voltage of 5V, but this reference voltage may also be 8V or 12V (depending on the model).

2.Some cars are designed in such a way that the engine can still start when the ECU of the engine does not receive a crankshaft position signal, such as Wuling's B series engine. The engine determines the top dead center of the piston and the engine speed based on the signal from the camshaft position sensor, and the engine injection method changes to group injection (sequential injection if there is no fault).

Even so, the operation of the engine is not normal, and the engine will have enough power.

Summary. Hello, I am your car master exclusive mechanic at your service. Here's a great day.

The Year of the Tiger is auspicious. We promise to be attentive, careful and attentive to solve your car troubles. Provide you with fault solutions and repair methods for your car.

Hello, friend, if there is no voltage in your car crankshaft sensor, this kind of failure is caused by the internal damage of your computer board and the problem caused by the lack of output voltage to provide power supply. Or it is that the circuit of this sensor that comes out of your computer version has this problem caused by this open circuit, and these two problems will cause you to have no power supply. You can do this maintenance and check according to what I told you, and measure this power supply line.

Is it the same on the PC side? If it's connected, repair the computer and buy it.

Hello, I am your car master exclusive mechanic at your service. Here's a great day. The Year of the Tiger is auspicious.

We promise to be attentive, careful and attentive to solve your car troubles. Provide you with troubleshooting solutions and maintenance methods for your car. Hello, friend, if there is no voltage in your car crankshaft sensor, this kind of failure is caused by the internal damage of your computer board and the problem caused by the lack of output voltage to provide power supply.

Or if you come out of the computer version to take this line of the accompaniment in this sensor, there is a problem caused by this open circuit, and you will have the problem of no power supply for these two problems. You can do this maintenance and check according to what I told you, and measure this power supply line. Is it the same on the PC side?

If it is the same, it will be Hengmin to repair the computer and buy it.

I told you about this, and if you said that you measured it, there was no power supply for this five-volt. Or is it a 12V power supply Chongjing, you have to check if there is a problem with your computer version, and whether the computer version has an output of electricity rotten to judge the training pressure? If there is no output voltage, you will repair the computer version, which has a lot to do with the computer version.

Look at what's going on.

That's because of this problem. If the gas pedal is added to 3000 rpm and cannot be added, you can check whether the three-way catalysis has a blockage problem, and check the three-edged branch catalytic blockage Wang Ye will also cause this failure. Yinling Min.

You check the three-way catalysis and this fuel filter.

The idle speed is high and 2,000 turns shake, and if you give some oil, you won't shake, what is the reason for the throttle.

If the throttle is fired, either the mixer on your side is wrong, the mixer is too thick, or the problem is caused by the chaotic ignition of the gas distribution phase.

The column position sensor has no signal, the plug is out of power, and the column position sensor can be used to drive without installing the column position sensor, will the timing be wrong, and there will be no error in this verification, or is it a failure caused by a problem in this mixer?

How to fix it? If you want to solve it, you can check Jing Douheng in terms of mixed temperament, whether you have a problem with the ignition sequence, a problem with the pin cover or this computer board, or a problem with air leakage in the air intake system, these must be checked.

Summary. If it does not affect driving, it can be replaced for safety reasons.

My car, detect engine crankshaft sensor failure, but can start, is it normal.

Pro, the failure of the crankshaft position sensor will cause the car to start delayed, unstable speed, steering imbalance, it is recommended that you do not drive, because the role of the crankshaft position sensor is to provide the engine speed signal to the engine computer, piston top dead center signal, and control the engine Sun Qing injection ignition moment, in general, the failure rate of the crankshaft position sensor under the bridge is not very high, it is recommended to go to professional maintenance to check whether there is a fault in other components.

If there is a fault with this, you still have to go to the repair to see if there is a problem, and go to a professional repair shop to check if there is a problem.

There is a fault jumping out or there is a problem, oh dear.

My car idling off and not playing for more than ten minutes, and then checking the crankshaft sensor fault code red, now it is normal again.

Able to drive normally.

There is a jump fault code Jianyu is discussing or checking it to compare Peiyu insurance, it may also be that there is no problem with the accidental jump, it is good to eliminate it with a decoder, and it can be used to destroy the rock, you can use the decoder to eliminate.

But this one is still recommended to be overhauled to see if there are any other problems, dear.

Said that there was no problem with normal driving.

It's no problem to get a new one.

Can't you check it out.

If it does not affect driving, it can be replaced for safety reasons.

Yes. If there is no problem with normal driving, the problem is generally not big, so use a decoder to eliminate it.

Okay thank you.

1. It may be that the computer board or crankshaft sensor is broken, and it is recommended to replace it after finding out the reason.

2. The function of the crankshaft position sensor is to determine the position of the crankshaft, that is, the angle of the crankshaft. It usually works in conjunction with a camshaft position sensor – to determine the basic ignition moment. We all know that the engine starts igniting at the end of the compression stroke, so how does the engine computer know which cylinder is due to ignite?

It is calculated by the signal of the crankshaft position sensor and the camshaft position sensor, through the crankshaft position sensor, you can know which cylinder piston is at the top dead center, and through the camshaft position sensor, you can know which cylinder piston is in the compression stroke.

It may be that the computer board is broken and the crankshaft sensor is broken, the computer board will not send an ignition signal to the ignition coil if it is broken, so the ignition coil will be out of power, and the crankshaft sensor will not be able to sense the cylinder top dead center and will not send a signal to the computer, and the computer will not send an ignition signal to the ignition coil if it does not receive the signal, so the ignition coil will not be powered.