What will happen if the tachometer doesn't return to zero after Nissan Qi Jun cleans the throttle?

There are many reasons for this. You can check whether your car has the following conditions.

The reasons why the tachometer does not return to zero are:

1, the tachometer itself is faulty;

2, tachometer power or ground fault;

3, tachometer data bus failure;

4. The fuse is blown;

5. There is a foreign object stuck in the tachometer, which cannot be moved;

6. The vehicle mileage sensor is out of order.

Tachometer is a tool to measure the speed, linear speed or frequency of motor. Its working principle is: according to the magnetic principle, it receives the pulse signal generated when the primary current in the ignition coil is interrupted, and converts this signal into a displayable speed value. Treatment method of tachometer not returning to zero;

1, check the operation of the tachometer;

2, open and clean up the foreign body in the tachometer;

3. Replace with a new tachometer;

4, check whether there is any fault on the line.