A good work of each piece of car ensures the safe and correct operation of the entire car. Changes in the usual work of the car often indicate the failure of those or other mechanisms and devices. The information provided by various sensors helps to find and eliminate the source of the problem.
Lambda Probe - What is it and what is his appointment?
The probe is a sensor, the main task of which is to control the oxygen content. Lambda's correct operation provides the best composition of the fuel mixture. Admission overly "poor" or, in contrast, the "rich" fuel mixture provokes the sensor reaction and the corresponding signal is supplied to the car's computer. Next, the technique performs the necessary correction to prepare the optimal composition of the fuel.
- Optimal oxygen consumption for combustion of 1 kg of mixture is 15 kg.
- The correct work of the lambda is directly related to fuel consumption and the force of the machine.
Checking the health of the oxygen sensor
The most frequent manifestations of lambda malfunctions are:
- Increased fuel consumption.
- "Rods" floating engine speed.
- Increased concentration of toxic substances in exhaust gases.
The appearance of such "symptoms" requires an immediate probe verification. Depending on the car model, a sensor with one, two, three, four and even five wires can be installed. At the same time, the signal wire is only one (in any case), other cords - for heating. The lambda probe check includes a visual inspection, as well as a survey with measuring instruments - a voltmeter or oscilloscope.
Visual inspection of the oxygen sensor
- Check the Lambda Connectors connectors. Fixing the probe must be strong.
- Next, examine the actual sensor. It should not be on it:
- Say. It clogs the device and affects the correctness of his work.
- Brilliant sediments. This flare is a sign of increased lead in the fuel used.
- A gray or white colors also indicates the need to replace the sensor. The most common reason for the appearance of such a plaque is the entry of engine oil.
Diagnosis of oxygen sensor
- Checking lambda starts with a car warming up. The correct estimate can be carried out only at temperatures more than 300C.
- The voltmeter is in fixation mode of constant voltage.
- The signal wire of the diagnostic probe is attached to the "plus". Minus probe "throw" on the engine body.
- Squeeze the accelerator until you get 2500 - 3000 rpm. Hold this position of about three minutes. During this period, the sensor is heated.
- Assess the testimony of the measuring instrument. Voltage indicators must be in the range from 0.2 b to 1 B. The inclusion frequency of the sensor in 10 seconds should be 10 (8-10 is allowed).
- The sharp pressing of the accelerator translates the voltmeter arrow to the mark 1 B - the sensor works correctly.
- With a sharp throwing of the accelerator pedal, the voltmeter arrow drops to 0 B - the oxygen sensor is in charge.
- At the same time, the indicators of 0.4-0.5 B and the lambda's lambs talk about the need to replace the latter.
Causes of failure
The most common factors provoking the failure of the oxygen sensor are:
- Penetration under the brake fluid lambda hull.
- Using prohibited to clean the probe of funds.
- Pouring of poor-quality fuel, resulting in an excessive heating of the sensor housing. Such development of events provokes incorrect operation of the cooling sensor, pressure regulator, fuel filter worn. As a result - the contaminated composition into the chamber.
- Increased lead concentration in fuel used.
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