You will need
- shaped screwdriver;
Disconnect the sensor connector. Start the engine. Raise the engine speed to 1500 rpm or more. Start the movement. If you feel the car "playfulness", it means that the MAF sensor is faulty and should be replaced by a new one. This is the first check option. If the MAF sensor is disconnected, the controller goes into emergency mode, so the mixture is prepared only under throttle.
Turn on the tester is in measurement mode DC voltage set the measuring range of 2 V. the Second option check sensor MAF. Measure the voltage between the yellow wire "exit" (closest to the windshield) and the green "ground" (3rd from the same region) in the sensor connector. Colors can vary, depending on the year of production, but the location is unchanged. Turn the ignition on, but engine not crank. The probes and infiltrate through the rubber seals of the connector along the wires, get to the contacts without disturbing the insulation. Connect the tester and take readings. These parameters can be removed and the on Board trip computer, if equipped. They are in a group of values "voltage sensors" and are denoted by U MAF.
To evaluate the results. The output of a good sensor, voltage should be 0.996-1.01 V. In the process, it gradually changes upwards. In this parameter you can define the degree of "wear and tear" of the sensor. For example: 1.01-1.02 – sensor working, 1.02-1.03 In - sensor working, but already "hooked", 1.03-1.04 In – will soon need to be replaced, 1.04-1.05 In – it's time to change, and 1.05 In the above – operation is not possible, the mandatory replacement.
Inspect the sensor when readings deviated from the norm. Figured take a screwdriver and Unscrew the clamp rubber corrugated air inlet, located at its output. Remove the corrugations, and carefully inspect its inner surface and the sensor. They should be free of condensate and oil. This is the most common cause of damage to the MAF. If they are, then it exceeded the level of oil in the sump and clogged the maslootboynika crankcase ventilation. Before replacing the sensor for a new one. It should be rectify the fault.
The normal operation of the catalyst will be provided only in case of proper dosage of gasoline and air. So, if there is a problem with the meter, don't expect normal engine operation. How to check up serviceability of the gauge of the mass expense of air, described in this publication.
Sensor mass air flow (MAF) is located near the air filter to determine the amount of flow passing. through the air filter. Check the operation of the sensor in the following way: 1 Way check dmwr. 1. Disconnect the sensor connector. 2. Start the engine. 3. The engine speed should be more than 1500. Try to take a ride.