How to solve fault code p0321?

[AnthonyRose]

p0321 fault code solutions are as follows: 1. The causes of the p0321 fault code include engine speed sensor failure, sensor wheel failure or mismatch, electronic control module (PCM or ECM) failure, etc. If it is an engine speed sensor failure, you can measure the resistance between the two pins of the sensor (the normal value should generally be between 0.7-1.2). If it exceeds the specified resistance range, it indicates that the sensor is faulty and the speed sensor should be replaced. 2. The engine speed sensor is an inductive sensor used to identify the engine speed. Together with the Hall sensor, it identifies the top dead center of cylinder 1 ignition to determine the fuel injection timing and ignition timing. It obtains the engine speed and accurate crankshaft angle position (input system). The troubleshooting method for speed sensor failure is as follows: Using an oscilloscope for waveform detection is the most effective. The engine control unit does not receive the speed signal or the received signal is unstable. The reasons include the following: 1. The distance between the sensor and the target wheel is too large. 2. The sensor wire is short-circuited or open-circuited. 3. The sensor is damaged.