POST UPDATED IN October, 2021

What is the CMP sensor?

The CMP is a sensor that is located at the level of the camshaft and in this way can specify the appropriate injection sequence. It is of the Hall Effect type, since it gives a square signal, and magnetic type, when it gives a sinusoidal signal.

It consists of a copper coil wound on a magnet core. In addition, it has 3 terminals: one ground, another 12 volts and the third is responsible for giving signal voltage to the ECM (Engine Control module). The voltage generated by this sensor is defined by factors such as the speed of the motor, the proximity of the metal rotor to the sensor and the strength of the magnetic field given by the Camshaft Position Sensor.

How does the CMP sensor work?

It is responsible for sending signals to the Engine Control Module (ECM), which uses this signal to synchronize the moment in which the fuel injectors are activated in the correct sequence. To establish the correct injection sequence, the ECM (Engine Control module) uses the signal from the Camshaft Position Sensor to thereby establish the position of the piston number 1 during its travel inside the cylinder. In the event that the engine is running and the Engine Control Module (ECM) observes an incorrect signal from the CMP sensor, a diagnostic code related to this sensor is established. Similarly, the light on the Check Engine board lights up.


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