You will need
- - multimeter (tester);
- - Allen wrench
Please note: the car access to the knock sensor complicates the intake module. As a result, remove the knock sensor to the touch. To facilitate the process, remove the splash shield of the engine and remove the sensor, get close to him from the bottom of the car (on a viewing hole or overpass).
For removing the knock sensor Unscrew the Allen key sensor retaining bolt from the cylinder block. Remove the sensor from the mounting studs and remove it from under the intake module. Disconnect the harness connector from the sensor by pressing the locking button.
To test the sensor, connect its findings multimeter included in the mode voltmeter with a measuring range up to 200 mV. For a proper connection, one-touch sensor to the device, the negative lead (black) connect the device with the weight sensor (installation location of the bolt). The positive wire (red) connect signal wire located in the connector of the sensor. Two-pin sensors, connect both pins to the wires of the tester with the correct polarity.
Then with a screwdriver lightly tap on the sensor body, mimicking the detonation. The tester should show voltage spikes size 40-200 mV depending on the force of the concussion. If any malfunction of the sensor reaction to the shock will not. The sensor should be replaced. Remember that in some cases, the devices are not able to detect a weak signal and Vollmer will malfunction the sensor.
Set the tester mode to measure resistance and connect it to the terminals of the sensor. It is desirable that the device had the ability to measure an infinitely large resistance. Defective knock sensor on the car must have very high resistance tending to infinity.
A more accurate test of the knock sensor is only possible on a special stand. Proven sensor install in the reverse order. Mounting bolt tighten to 20-25 Nm.
Advice 2: How to check vehicle sensors
Modern fuel injected engine is controlled by many sensors. But the electronic system, engine control may not always be the cause of his failure. So, before you inspect the condition of the sensors, verify the health of the rest of the parts and components of the power unit. The only fact that points directly to the fault of any sensoris lit-up on the instrument panel Check Engine lamp.
You will need
- - tool for the dismantling of the hinder parts; - ohmmeter (multimeter).
Sensor throttle position (TPS) is a variable resistor. To check it, measure the resistance between its terminals. The reading will compare with factory values specified in the operating instructions (on different machines, different sensors). The discrepancy in 20% consider normal. Also a faulty TPS can specify the instability of the idle jumps while speed is increased.
The knock sensor without specialized equipment could not be verified. An indirect sign of its failure, excessive detonation when the engine is running. For diagnosis and sensor replacement please contact the staff. The same applies to the sensor of phases timing. It is installed only on engines with four valves per cylinder. Its verification is done using special diagnostic devices.
If the engine refuses to start, it is a symptom of the crankshaft position sensor. This sensor only in case of breakdown which the engine refuses to run. To spend an additional check, measure the resistance between the terminal in advance of unplugging the connector. Normally, this figure should be 550-750 Ohms.
Also cause malfunction of the crankshaft position sensor may be a controller mounted on the driving drive pulley of the crankshaft. A rubber damper mounted on a gear wheel of the controller can be rotated relative to the pulley. To test this, locate the marks on the camshaft and the flywheel. By the way, the mark on the flywheel duplicate the mark on the crankshaft. If the movie is correct, these marks are the same, but between two missing teeth between the reluctor wheel and the axis of the crankshaft sensor fits 19-20 teeth on the toothed wheel.
To test the sensor mass air flow disconnect pad wires suitable for him. Then measure the resistance between the terminal indicated in the circuit of the electronic engine control, and ground. Usually it should be 4-6 ohms. Either remove the sensor from the opened motor. The engine will not lower the rpm less than 1500. Also a defective MAF sensor is unstable operation of the power unit, hampered its start-up, delays, jumps, dips while moving, lack of power and traction of the car.
To verify proper speed sensor, go to neutral while the vehicle is idling. With proper sensor the revs will increase slightly. On cars VAZ-2110/2111/2112 when a faulty speed sensor stops working speedometer.
To check temperature sensor coolant look in the documentation for the repair of a special table. The temperature change in the cooling system must be accompanied by a change in resistance of the sensor according to the table.
Oxygen sensor check by measuring the resistance of the heater, previously unplug the connector. The result should be from 0.5 to 10 Ohms depending on the sensor model. Search for accurate data in the repair instruction. Also to check, remove the connector from the sensor, turn the ignition on and measure the reference voltage of the controller, crankshaft position sensor, it should equal 0,45 V.
Advice 3: How to check the sensors VAZ 2110
The owners of car VAZ 2110 must possess information about all major sensors of the vehicle. They provide stable work of the engine. You must also be able to properly check.
First, pay attention to the temperature sensor coolant. He is a thermistor. This sensor is wrapped in the outlet coolant, which is located on the cylinder head. At low temperature the sensor resistance must be high and at high temperature – low.
The coolant temperature calculated by the controller. This temperature influences most of the characteristics, which are controlled by the controller.
Also of great importance is the knock sensor. It is wrapped in the upper part of the cylinder block. Its main objective is to capture abnormal vibrations in the engine. The most sensitive element of the sensor is piezocrystals record. When knock occurs, the output of the generated voltage pulses. They are able to increase with the increase of intensity of detonation blows. The sensor sends a signal, and the controller carries out the adjustment of ignition timing. Thus, the elimination of detonation flares of fuel.
Note the sensor of oxygen concentration. It is installed on the exhaust front pipe. The oxygen contained in the exhaust gas reacts with this sensor, this creates a potential difference at the output of the sensor. There is a change from 0.1 V to 0.9 V. To make the switch is normally concentrated oxygen, it must have a temperature above 360°C. For this purpose, he installed the heating element. He is able in a short time to warm up the sensor to the required temperature. Thanks to the sensor, the controller determines which command to adjust the composition of the working mixture feeding to the nozzle. When you lean the command is given to enrichment, while a rich mixture is a lean condition.