The engine ECU is an electronic control unit that coordinates all engine functions. As a rule, it is made of heavy-duty materials, has a high build quality and is characterized by a long service life. But any mechanism is designed for a certain number of uses and, sooner or later, it fails. In this case, the engine ECU needs to be repaired.
Engine ECU repair in Moscow: all the details of the process
The ECU can be called the "think tank" of the car. That is why car owners who are faced with the need to repair it often look for a workshop to “repair the brain of a car”. And it is impossible to delay in solving this problem, since a faulty computer leads to an imbalance in the functions of all systems and elements of the machine.
Engine ECU device
Structurally, the electronic engine control unit consists of three parts.
- main block.
- Control sensors.
- executive elements.
At the same time, an integral part of any computer is a large number of specific microcircuits, transistors, capacitors and resistors. It is not easy for an uninitiated person to understand them, which makes it difficult to repair the engine ECU with your own hands.
Engine ECU Functions
The main function of the ECU is to process signals from engine sensors to correct the flow of fuel into the power unit. Thanks to its uninterrupted operation, it performs the dosage of the fuel mixture and sets the operating modes of the engine as a whole. Therefore, when the ECU fails completely, it is simply impossible to start the engine of the car.
In addition, we must not forget that the engine ECU is an integral part of all on-board vehicle equipment. Maintaining an inextricable information link with its main elements, a faulty ECU can affect the operation of the automatic transmission, anti-lock and other systems.
Basic principles of computer operation
Thanks to the correct operation of the electronic control unit, the optimization of significant parameters in the operation of the engine is carried out.
- Fuel and oil consumption.
- Power indicators.
- Torque is important for acceleration of a car.
- Composition of exhaust gases.
Information about these parameters is continuously fed to the ECU controller. Analyzing it, he immediately corrects the work of the executive elements.
Note! In the process of tuning the engine, you can reprogram the factory parameters of the ECU.
Signs of a faulty engine ECU
Malfunctions in the operation of the computer occur due to a violation of contact with the sensors that control the operation of the engine. The main signs of the lack of necessary contacts can be recognized by every car owner.
- Scanner data is incorrect or missing.
- When the ignition is switched on, the control lamp "check" does not function.
- There is no information about the operation of the engine.
Note! Timely detection of signs of an ECU malfunction is a serious reason for contacting a car repair shop. Subsequent qualified repair of the electronic control unit will avoid disruptions in the operation of the main vehicle systems.
Why did the engine ECU fail?
Among the main reasons that led to the malfunction of the ECU, the following negative factors can be distinguished.
- Mechanical impact on the device - strong vibration or shock can lead to the formation of tiny cracks in the computer chips.
- Moisture ingress into the ECU housing.
- Overheating of the ECU due to a sharp increase in temperature.
- The implementation of the process of "lighting" another car while the engine of the car is running.
- Incorrect battery connection.
- Previous attempts at unskilled ECU repair.
Note! At any time, qualified car service specialists can diagnose the condition of the engine ECU in order to detect possible malfunctions. Their timely elimination will help to avoid costly repairs and the final failure of the unit.
Engine ECU Diagnostics
Note! If you encounter the following malfunctions in the operation of your car, then immediately diagnose the computer.
- Any problems that arise at the time of starting the car engine.
- The presence of thick smoke during engine operation or its tripling.
- Any interruptions in feedback from the ECU.
- The reaction of the car to the gas pedal has decreased or is completely absent.
- The operation of the motor fan is not controlled.
- Lack of signals from sensors or failure of fuses.
- Ignition coils are failing.
To carry out diagnostics in a car service, specialists connect a laptop to the computer with a special program that reads the available performance indicators and device data. Their subsequent comparison with standard indicators allows you to identify malfunctions in the operation of the computer.
Diagnostics and repair of the engine ECU
During the diagnosis of the computer, it is possible to detect two possible malfunctions - a device firmware failure or a conductor failure. Both malfunctions can be eliminated in a car service. In case of problems with the firmware, the specialists will perform a flashing of the engine ECU. And in the event of a conductor malfunction, they will repair it, which is carried out in several stages - detecting a break (breakdown) and installing a parallel wire of the required resistance for signal transmission.
Note! In most cases, a faulty engine ECU can be repaired. If it is impossible or inappropriate to carry it out, you will be recommended to buy a new ECU.
1)
Repair of the control unit begins with a call to Raccoon.
2) Next, you explain the essence of your problem to our specialist.
3)
Bring the control unit for repair or we can send a courier for the unit.
4)
We make diagnostics, coordinate with you the terms and cost of repairs.
5)
You come and pick up the finished block or we can send the block to you by courier.
One of the main activities of the Enot company is the repair of ECUs (electronic control units), in modern cars their number can reach up to 15 and they are all parts of a single organism. And malfunctions in one of the blocks are reflected in the operation of the entire car. The reasons for the incorrect operation of electronics can vary from moisture ingress to errors in the manufacturer's software, but most often the human factor plays a role here. This may include dampness in the vehicle, improper operation, late maintenance or operation of the vehicle with malfunctions.
Enot specialists have a deep understanding of the intricacies of automotive electronics, so we take on even complex malfunctions and use only original spare parts in our work. They turn to us for help in diagnosing or repairing electronic control units, both service stations and the customers themselves, and if in the first case the specialists of the addressing service station can give detailed information about malfunctions, if the owner of the car contacts us, he almost always provides detailed information does not have. But we always meet our customers halfway and try to help. We accept electronic control units for diagnostics and, if necessary, we ourselves communicate with electricians who service our client’s car to find out the details of malfunctions in the operation of the electronic control unit. And such a joint work necessarily gives a positive result.
We repair electronic control units of cars, trucks, special equipment. The repair of any control unit begins with an analysis of the declared malfunctions, it happens that already at the stage of talking on the phone with the client we understand whether the control unit is working or not, and if the unit is working, we give recommendations on checking and troubleshooting in the car. If we understand that the electronic control unit is really not working, then after delivering it to our workshop, we diagnose and agree with the client on the terms and amount of repair. In most cases, 2-3 days are enough for repairs. But in more complex cases, repairs can take up to 2-3 weeks, since the electronic control units of cars are assembled on a special element base, and delivery of spare parts from abroad takes some time. We use the services of only reliable and proven suppliers of spare parts. Professional equipment, high-quality element base, unique knowledge accumulated over the years, and an ardent desire to help the client, these are the factors on which our work is built.
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Some general information about electronic control units ECU:
The abbreviation E-C-U (read. E-K-U) in the automotive industry means electronic control unit (ECU). Verbatim ECU This Electronic Control Unit (ECU). Modern cars have many different ECUs. They are related to the engine anti-slip and anti-lock braking system brakes, automatic transmission, active suspension, full-time security system, air conditioning, radio and navigation, etc. One of the most important components is it's electronic engine control unit - ECU. Various car manufacturers and various thematic sources, it can correspond to the names ECU, DME, DDE, ECM(Engine Control Module), PCM(Powertrain Control Module) and some other abbreviations ECM (Engine Control Module, often combined with the automatic transmission control unit- Control block PCM). Titles PMS And PLD used in some car engine control units mercedes, issued by companies Bosch and Siemens . Often, for many manufacturers, the engine control unit combined with automatic transmission control unit(automatic transmission) in one case. In this performance, most often it is called PCM(Powertrain Control Module). Such solutions are used Ford, Mazda, Toyota some German and Korean manufacturers.
Let's take a simple example of block PCM from Toyota RAV4 1AZ-FE AT 2002 release, USA. As can be clearly seen in the figure below, Control block PCM/ECM Toyota RAV4 has 2 CPUs - each works independently (at the same time, constantly exchanging data with each other), giving executive commands and processing signals from automatic transmission and ENGINE sensors. The processors control the automatic transmission solenoids and injectors through specialized driver microcircuits.
On the picture : electronic Control block d engine and automatic transmission ECU (PCM/ECM)from Toyota Rav 4 1AZ-FE 2002 year. Part number according to Toyota: 89661-42821. The electronic components for engine and automatic transmission control are combined in one housing on a single printed circuit board. We carry out repair of control units ECU PCM Toyota RAV 4 from 2000 to 2004 release (bumps when shifting gears, solenoids errors) at a special price 6500 rub with a guarantee 6 months.
To avoid confusion with many terms, we will stick standard term ECU - ECU"electronic control unit" , if necessary, complementing his affiliation yu to a particular group of blocks.
Please, ask for a complete listing of diagnostic codes , and if this is not possible, then ask the diagnostician, what function is missing or incorrectly performed ECU. Remember that failure to answer this question usually means poor quality. the diagnostics carried out and the corresponding level of knowledge of this"masters". Correct identification of a malfunction at a preliminary stage of diagnostics, as a rule, several times shortens our time for her final search and elimination and the money you spend for repairs.
Below we will try to list O main reasonscontributing malfunctions V ECU electronic control units ECU :
1. Unskilled intervention during car repairs.
2. "Lighting up" from a car with a running engine or from charger.
3. Swapped terminals + and
-
when connecting the battery.
4. Removing the battery terminals with the engine running.
5. Consequences exposure to time and harmful environment (oxidation of contacts in the block and the unsuitability of the tracks - in most cases it concerns blocks installed in the space of the engine compartment).
7. Ingress of water or other liquids into the inside of the ECU/PCM housing.
8. Malfunctions of the output circuits of the ignition system: coils, wires, distributor, candles. As a result - failure of components in the ECU.
Repair of the engine control unit today can be done by yourself if you have little electronics repair skills.
An electronic engine control unit, abbreviated as an ECU, is an electronic device that, using various signals from engine sensors, controls the composition and amount of fuel supplied to the engine.
With the help of sensors, it very finely determines the mode of operation of the engine and doses the fuel mixture very accurately. At the same time, the engine runs stably both unheated and warmed up. But if it fails, then you will not be able to start the car engine.
The ECU block consists of microcircuits, transistors, capacitors and resistors. All these elements can fail at any time. The control unit, using powerful transistors (compound Darlington transistors), controls the ignition coil or several coils, depending on the injection system, as well as the idle speed control valve, electric injectors, fuel tank vent valve, various solenoids, etc. If any of them fails, we lose the control signal by one or another actuator.
I want to give an example of one story. A friend had a car bmw 3 series. M-40 engine with a volume of 1.8 liters. Once he went to visit relatives in a neighboring village and decided to sink a little along the highway. He pressed the gas pedal almost to the floor and began to accelerate, but just did not have time. I caught a “good” hole on the pavement and, out of surprise, stepped on the gas more. The car roared and ... stalled.
No matter how much he turned the starter, it did not start. Just put in the battery. They dragged him home on a cable and his torment began to find the cause. In short, many craftsmen were tinkering and could not really find anything, or rather they found the absence of a spark. According to the owner, they also changed the ignition coil, high-voltage wires, they also looked at the distributor, nothing suspicious was seen.
Well, he decided to ask me, maybe I know something about this. Honestly, I had no particular desire to mess with the car. Car repair, although a promising occupation today, but I have no conditions for this. There is no garage in the first place. It is necessary to build, but there is not enough money to build something worthwhile. Anyway…
I took the instruments with me (multimeter, oscilloscope, pulled out the electrical injection circuit from the autodata program), the tool and went to the garage where the car was parked.
To begin with, I connected a 12-volt light bulb in parallel with the ignition coil and turned the engine over with a starter. The lamp barely flashed, but should blink at full intensity. Since this engine did not have an ignition coil control switch, the coil was controlled from the engine control unit itself.
For reliability, I measured the signals from the sensors with a digital multimeter at the connector of the engine control unit according to the map specified in the autodata program. All the signals were normal, which ultimately led to the culprit of the malfunction - the ecu. For this, the unit was dismantled from the car with its subsequent disassembly. Thus, on the board, I determined the output Darlington transistor, which connected one output of the ignition coil to the mass of the car.
Using an oscilloscope, I measured the waveform at the collector of the transistor. It was irregularly shaped with strong distortions. Based on the transistor, the signal was of the correct form. This determined the culprit in the absence of a spark. An analogue was bought and soldered into place. After that the car started up. This is what happens.
Attention!
We carry out repair of control units in Kazakhstan in the village. Irtyshsk. It is possible to send the faulty control unit to us by mail. We will repair and send back. Disable car immobilizer. To do this, you send or bring us the engine control unit, we restore the SRS (airbag) units, and clean up the collision data. Contact details by E-mail: [email protected], whatsapp +77058715032
There are a bunch of examples, but let's give the basic troubleshooting steps for an ECU. ECU repair should be started after full confidence that the control unit itself is to blame.
And so, what to do if the car stops starting.
1. Check whether there is a spark, fuel injection and whether the fuel itself is supplied from the gas tank.
2. If the pump supplies fuel, there is fuel injection, but there is no spark, then check the ignition coil control switch for serviceability. This is done by installing a known-good switch. If there is no switch, then the coil control transistor is located in the ECU itself. It needs to be checked.
3. If there is a spark, but there is no fuel injection, then you need to check the injector control transistor in the ECU. If there is an ignition coil control switch, then check the output of the control signal from the switch to the ECU. If there is no signal in this case, then the ECU will not give a command to open the injector.
4. If there is no spark at all, no fuel injection, then you need to check the health of the hall sensor or, if not, the crankshaft position sensor. The best way to do this is to use an oscilloscope.
And so you concluded that the engine ECU is faulty. Then remove it from the car, but first do not forget to remove the negative terminal from the battery.
For example, consider the BMW engine ECU. Before disassembling it, carefully inspect its connector for visible damage.
Very often, the contact leads are oxidized and covered with greenery. And this, in turn, is a bad electrical contact. And hence the unstable operation of the injection system as a whole. Using a screwdriver, bend the petals on the cover and remove it.
Then, using a special tool, unscrew the screws on the back of the ECU unit.
You can carefully remove it. Our eyes are looking at the reverse side of the printed circuit board with soldered leads.
Well, now about the main thing. The most common cause of engine ECU failure is cold soldering of radioelement leads. That is, the output is, as it were, soldered, but a microscopic circular crack forms in the solder around it. The element seems to be soldered, but in fact it is not. Pick up a good magnifying glass and carefully inspect the entire circuit board. If you find a non-solder, then feel free to grab a soldering iron.
The second thing you should pay special attention to is the burnout of microcircuits and transistors.
Such elements must be replaced with serviceable ones.
If burnouts and external damage are not detected during visual inspection, then we proceed to the identification of faulty elements, in particular Darlington transistors. What is a Darlington transistor.
This is a composite transistor of two transistors. How to check such a transistor will be written in one of the following articles. Do not miss. Subscribe to blog updates by email. It is best to install a known good one instead of a dismantled transistor.
Another thing I would like to draw your attention to. The board has an installed quartz resonator, which, with sharp blows, can lose its performance. 
And this can cause a loss of operability of the fixed frequency generator.
Do-it-yourself ECU repair very often compensates for the additional costs that you may incur if your electronic engine control unit fails.
Watching video
Good luck with your ECU troubleshooting and repair!
