The sensor of detonation VAZ-2110. Description and Replacement

The detonation sensor VAZ-2110 can be safely classified as the most reliable element in the whole car. Despite its small size, it performs a very important function, giving out to the controller indications of the current knocking in the engine. Based on the received data, the latter performs the correction of the ignition timing for detonation.

The resonance sensor of detonation VAZ-2110

This type of mechanism is of the piezoelectric type. It is located on the power unit. In the event that detonation explosions occur in the engine, the sensor generates an alternating current signal whose amplitude and frequency values directly depend on the level of the detonation that has occurred. The input of the knock sensor is a reference voltage from the controller of 5V. Inside the measuring element is a resistor with a resistance of 330-450 Ohm, which lowers the value of the input voltage to 2.5V. If no detonation occurs (in normal operation of the power unit), the output voltage remains 2.5V. Otherwise, the sensor outputs an AC signal to the controller via the reference signal circuit at 5V. The thing is that the input signal is the DC voltage while the reverse is the AC voltage. The amplitude and frequency of the signal output from the sensor depend on the level of detonation explosions in the engine of the car. The controller reads the received data and on their basis performs the correction of the ignition timing to extinguish the detonation.

Broadband detonation sensor VAZ-2110

As well as resonance, this type of mechanism is of the piezoelectric type and is located directly on the engine itself. When the power unit is operating, the sensor generates a signal in the form of an alternating current voltage, the amplitude and frequency of which depend on the same vibration indices of the engine. If detonation occurs in the power unit, the vibration amplitude of a particular frequency increases, resulting in an increase in the amplitude of the output signal from the sensor. It comes to the controller, which, based on the received data, adjusts the ignition timing, thereby equalizing the engine performance.

As mentioned before, the mechanism under consideration is quite reliable. Therefore, if there is a suspicion of its malfunctioning, first check that the VAZ-2110 detonation sensor is broken. Those. To examine his contacts and wires for integrity. There is a high probability that the reason for the incorrect work lies here. If the inspection did not reveal any malfunctions, then it remains only to replace the mechanism with a new one. Otherwise, the engine will continue to run unstable. Perhaps higher fuel consumption at the VAZ-2110.

Replacement of the knock sensor

1. The first thing to do is to de-energize the system. To do this, it is enough to disconnect the wire from the negative terminal of the battery.
2. Next, disconnect the wire harness from the sensor contacts.
3. To remove the mechanism, unscrew the fastening nut.
4. Install the VAZ-2110 detonation sensor in the reverse order.