Error P0102: troubleshooting the air flow sensor

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DIAGNOSE YOUR CAR YOURSELF!
Code P0102 is entered if the following conditions exist:

engine speed above 560 rpm air consumption below 2.5 kg/h. The CHECK ENGINE lamp comes on 8 seconds after a permanent fault occurs.

1. Check the presence of supply voltage and the reliability of the connection to ground.

2. The resistance between pin 5 of the harness block and ground is determined, which should be within 4.6 kOhm.

An intermittent malfunction can be caused by poor contact, incorrect route of the harness, damage to the insulation or wire core, or an unreliable connection of the sensor to ground, or the connection of additional powerful consumers to the harness. You must ensure that there are no following faults:

Unreliable connection between pins 7 and 12 of the injection system harness and controller. Inspect the harness block and the controller connector for completeness and correct alignment, damage to the locks, the presence of damaged contacts, and the quality of connection of the contacts to the wire.

Wrong harness route. Make sure that the sensor wiring harness is not routed near high voltage wires.

Damage to the tourniquet. Check the harness for damage. If the harness appears to be normal, move the appropriate pad and harness while observing the scan tool.

Clogged air filter in the air intake system. If necessary, replace the filter element.

Start the engine. Select "Errors" from the menu. If the DTC is not currently active, refer to Diagnostic Information. Code P0102 is not permanent. If there are no other codes, analyze the conditions under which the code occurred.

1. Turn off the ignition. Disconnect the harness connector from the sensor. Turn on the ignition, the engine does not run.

Using a multimeter, measure the voltage between the terminals of the harness block. The multimeter should show the following voltage values:

between contacts “2” and “3” – more than 10 V; between contacts “3” and “4” – 5 V. between contact “3” and ground – 0 V. For other voltage values, eliminate breaks or short-circuits to ground in the corresponding circuits.

2. Turn off the ignition. Using a multimeter, measure the resistance between contact “5” of the harness block and ground.

If the resistance is within 4..6 kOhm, the mass air flow sensor or its connection is faulty.

If the resistance is about 0 Ohm, there is a short to ground in wire 4 F, or the controller is faulty.

If the resistance is more than 100 kOhm, wire 4 G is broken, or the controller is faulty.

After repair, start the engine, reset the codes and make sure there is no signal from the “CHECK ENGINE” lamp.

Modern cars are stuffed with all kinds of electronics. On the one hand, this is convenient, since most faults can be determined using the on-board computer, but on the other hand, frightening messages often appear with fault codes in engine operation. Error P0102 is a frequent culprit of failures in VAZ family cars. What this code means and how to eliminate it, we will tell you in the article.

What does code P0102 mean on VAZ 2114?

Error P0102 for VAZ 2114 means a low signal level from the mass air flow sensor. This means that the signal coming from it is below the threshold set by the car manufacturer.

An error appears in the memory of the electronic control unit in the following cases:

• Air consumption is below the normal value determined by the manufacturer, which depends on the crankshaft speed and the degree of throttle valve opening;
• Since the problem occurred, two drive cycles have passed, that is, two trips.

This problem may be constant or occur periodically. It can be noticed by the readings of the on-board computer, if one is installed on the car, or during diagnostics.

What does error P0102 mean?

The operation of the engine is completely subordinate to commands coming from the vehicle's ECU. By collecting information from different sensors, the controller selects the correct modes for all machine systems. Error code P0102 indicates that the signal coming from the mass air flow sensor (mass air flow sensor) has a low voltage. This malfunction can be caused by several reasons:

1. Excessively clogged air filter. The amount of air entering the engine is not enough for the sensor to operate correctly - this is one of the most common reasons.
2. Proximity of high-voltage ignition wires to the mass air flow sensor. High voltage in nearby wires can create self-inductive currents in the sensor and lead to the generation of incorrect signals.
3. DMRV contamination.

What to check

If you need to replace your MAF sensor, we recommend using original manufacturer's original (OEM) parts. Non-original parts can be an additional problem.

Using a reusable oil air filter may cause P0102 if there is too much oil. Oil can get onto the sensor element inside the air flow sensor and contaminate it. In such situations, use a special MAF cleaner. We do not recommend using oil-based air filters.

What is the MAF for?

An internal combustion engine runs on a combination of fuel and air. For effective operation, a mixture is required that will burn out almost completely in the cylinders, and for this you need to choose the right ratio.

The mass air flow sensor, otherwise known as the MAF sensor, transmits readings to a computer, which selects the exact proportion of air and gasoline corresponding to certain crankshaft speeds.

Symptoms of the error

Undoubtedly, with error P0102, the car can continue to drive, but the operation of its engine will be unstable.

First, the Check Engine sign lights up on the instrument panel, indicating a problem. In this case, the car may have difficulty starting. Instead of stable speed, a cold engine will work intermittently, you will have to rev up the gas so that the engine does not stall.

The error signal may disappear for some time, but later the situation only gets worse: failures can occur not only at idle, but also while the engine is running under load. For example, during overtaking, when you need to squeeze out maximum power, the car may begin to jerk without gaining speed. The car may stall while driving as soon as your foot is removed from the gas pedal. All this can lead to an emergency on the road.

On which cars is this problem most common?

The problem with code P0102 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

• Audi (Audi a4, Audi a6, Audi TT)
• BMW (BMW X5)
• Chevrolet
• Citroen (Citroen Berlingo)
• Dodge
• Ford (Ford Mondeo, Mustang, Focus)
• Honda (Honda Accord, SRV, Civic)
• Hyundai (Hyundai Accent, Santa Fe, Sonata, Tucson, ix55)
• Infiniti
• Jaguar
• Jeep
• Kia (Kia Sorento, Sportage)
• Land Rover (Land Rover Range Rover)
• Lexus
• Mazda (Mazda 3, Mazda 323, Mazda 6, MPV)
• Mercedes (Mercedes w203)
• Mitsubishi (Mitsubishi Outlander, Galant, Lancer, L200)
• Nissan (Nissan Almera, Qashqai, Murano, Note, Primera, Tiida, X-Trail)
• Opel (Opel Astra, Vectra, Corsa)
• Peugeot
• Porsche (Porsche Cayenne)
• Renault (Renault Master, Traffic)
• Rover
• Skoda (Skoda Octavia)
• Ssangyong
• Subaru (Subaru Impreza, Forester)
• Suzuki (Suzuki Aerio, Grand Vitara)
• Toyota (Toyota Avensis, Camry, Corolla, Prius)
• Volkswagen (Volkswagen Passat, Touareg)
• Volvo (Volvo s60)
• VAZ 2107, 2109, 2110, 2111, 2112, 2114, 2115
• Gazelle Next
• Lada Granta, Kalina, Niva, Priora
• UAZ Patriot

With fault code P0102, you can sometimes encounter other errors. The most common ones are: P0113, P0157, P0171, P0174, P0183, P0194, P0300, P0303, P0316, P0351, P0352, P0353, P0354, P1476, P1730, P2106, P2195.

How to check the sensor

Before buying a new MAF sensor, you need to make sure that the old one is faulty. First you need to clean the air flow sensor with a special spray for sensors. Then look at the condition of the air filter. Replace if necessary. In more than half of the cases the malfunction will be fixed.

In order to diagnose the cause of error P0102, you need to do the following:

1. Erase the error code from the ECU.
2. Connect a scanner or on-board computer to the OBD-II connector and make a test drive.
3. If the error comes on again, check all the potential culprits: filter, connector, wiring harness.

In addition, you need to check the electrical circuit using a multitester and measure the voltage between the contacts of the block.

When the ignition is turned off, the connector from the sensor is disconnected. Then the ignition is turned on and the voltage is checked between contacts 2 - 3, 3 - ground, 3 - 4. Between contacts 2 and 3 the voltmeter should show 10 volts, between 3 and 4 - 5 volts, and between 3 and ground there should be no voltage.

After checking, you need to install resistance between pin 5 and ground. In normal condition it will be 4 – 6 kOhm. If the measurement data does not correspond to the nominal value, then there is either a break or a short circuit in the wiring. Resistance diagnostics are performed with the ignition off.

Only after the previous check can a conclusion be made that the MAF sensor is faulty.

The VAZ fault code P0102 is not permanent.

If this error code is not permanent, check the reliability of the connection of the block to the sensor, the correct routing of the harness, the presence of insulation damage, as well as the connection of additional consumers to the harness. When inspecting the connection block, pay special attention to possible damage to the contact locks, connections to wires, loosening and oxidation. If necessary, remove the contact from the connector and carefully bend it for a better fit to the mating contact.

When checking the correct installation of the harness, make sure that the harness is not laid near high-voltage wires and the exhaust manifold. In addition, it should not have visible damage. Move the connector and harness with the diagnostic equipment or on-board computer connected and the ignition on. If an error appears during this, it indicates a broken wire or poor contact in the block. If this error appears under heavy load and the throttle valve is opened more than 50%, then the cause is most likely a clogged air filter.

How to replace it yourself

The air flow sensor is located between the air filter and the massive air pipe connected to the intake manifold.

Once you have established that the VAZ error P0102 pops up due to the mass air flow sensor, you can safely go to the store for a new part. A new sensor costs more than 3,000 rubles and is sold complete with the pipe in which it is installed.

Replacement work takes place with the ignition off. First you need to disconnect the block with wires from the sensor. To do this, press the bottom of the chip on the latch and carefully remove the connector. In this case, you need to pull not by the wires, but by the block.

How and how to clean the mass air flow sensor (MAF)

Therefore, you can destroy the sensor with an aggressive liquid in no time. It costs a lot. For example, a mass air flow sensor for a Chevrolet Aveo will cost from 2400 to 3500 hryvnia (85-100 dollars), and the same sensor for a Ford Focus or Mazda6, MPV, CX, VAG cars from 80 to 120 dollars.

And yet, if the sensor has already been repaired or cleaned several times, it is useless to play with it. Most likely, the active sensitive elements have done their job.

To clean the sensor, under no circumstances should you use brushes, ear sticks, matches, pins or other nonsense. This is guaranteed to ruin the sensors. As well as liquids containing acetone and other solvents.

Interesting on the topic: Changing low beam lamps on Ford Focus 2

At your own risk, you can try the available cleaners:

1. Alcohols (ethyl, methyl, isopropyl). Apply to the sensor carefully, spraying through a medical syringe with a needle.
2. Formic alcohol . Best used on non-sensitive surfaces.
3. Aqueous solutions of glycerin (detergents, liquid powders, soaps). A questionable method, but if there is nothing else, you can try. Careful drying after washing is required.

There are a bunch of different compositions for cleaning mass air flow sensors on sale. There are also fakes among them. It's clear where the original is. The danger is that most cheap e-liquids contain acetone. Which destroys the sensitive element of the sensor.

DESCRIPTION

The MAF sensor (mass air flow sensor) measures the volume of air passing through the throttle body. The ECM uses this information to determine the duration of fuel injection and generate the appropriate air-fuel ratio. Inside the MAF sensor there is a heated platinum wire that is exposed to the incoming air flow. By passing a specified amount of current through the wire, the ECM heats it to the desired temperature. The flow of incoming air cools the wire and the internal thermistor, changing their resistance. To keep the current constant, the ECM varies the voltage applied to specified devices in the MAF sensor. The voltage level appears to be proportional to the air flow rate passing through the sensor, and the ECM uses this level to calculate the intake air volume. This circuit is designed in such a way that the heated platinum wire and the temperature sensor form a bridge circuit, and the power transistor is controlled so that the potentials of A and B remain unchanged, thereby maintaining the set temperature.

HINT: If one of these DTCs is set, check the air flow by accessing the following menus on the handheld scan tool: Powertrain / Engine and ECT / Data List / MAF.

How to Troubleshoot or Reset Trouble Code P0102

Some suggested steps to troubleshoot and fix error code P0102:

Diagnosis and problem solving

Check all wiring as well as the mass air flow sensor connectors. Make sure they are intact, not worn or broken. Wiring should not be routed too close to ignition wires/coils, relays, etc.

Visually check for obvious air leaks in the air intake system. Also, a lack of vacuum at the MAP sensor can cause this trouble code. It is worth checking the air filter; if it is dirty, it needs to be replaced. If there is a screen in the air intake system, make sure it is clean.

Closely inspect the MAF sensor to see any contaminants such as dirt, dust, oil, etc. Clean thoroughly with MAF cleaning spray is usually a good DIY diagnostic/repair step.

Low minimum air flow through the sensor opening may cause this DTC to set at idle or during deceleration. Check for vacuum leaks after the mass air flow sensor.

Use a scan tool to monitor the MAF sensor readings in real time. Check technical service bulletins (TSBs) for your specific make/model for known problems with your vehicle.

The atmospheric pressure (BARO) that is used to calculate the predicted MAF value is initially based on the MAP sensor when the key is on. High resistance in the MAP sensor ground circuit can cause this DTC to set.

Perform an exhaust backpressure test to determine if the catalytic converter is clogged.

If you really need to replace the MAF sensor. It is recommended to use the original OEM sensor from the manufacturer. And do not buy spare parts of dubious origin.

Using a reusable oil air filter may be the cause of the P0102 code if it is over-lubricated. Oil can get on the thin wire or film inside the MAF sensor and contaminate it. To clean in these situations, use something like MAF cleaning spray.

TEST SEQUENCE

HINT: Use a handheld diagnostic tool to read the fixed parameters. These parameters reflect the state of the engine at the time the malfunction was detected. When troubleshooting, fixed parameters allow you to determine whether the car was moving at the time of the malfunction or not, whether the engine was warmed up, what the air-fuel mixture was (lean or rich), etc.

Connect the handheld diagnostic tool to the DLC3.

Start the engine and turn on the handheld scan tool.

Select the following menu items: Powertrain / Engine and ECT / Data List / MAF.

Read the values ​​displayed on the scan tool.

Result: