In detail: do-it-yourself Nissan ecu repair from a real master for the site my.housecope.com.
On Japanese cars of the Nissan brand, the engine control unit sometimes fails. Electronic engine control units are installed by manufacturers Hitachi, Delphi, Denso, Motorola, Siemens and Bosch.
Reports on repair and restoration of ECUs ("brains") of Nissan cars:
On cars Nissan Almera, Avenir, Juke, Maxima, Murano, Patrol, Primera, Qashqai, Teana, Tiida, the ECCS 2 engine management system is used, which works with multi-position injection. Load is sensed by engine speed, air mass and throttle position.
A common problem with control units in Nissan vehicles is the failure of ignition coil control components. This usually happens due to the failure of the coil itself (a short circuit occurs inside it). The following symptoms appear: the engine begins to "run", 1 or more cylinders do not physically work. The following errors are diagnosed in the system:
P0300 - Ignition misfires detected in various cylinders;
P0301 - cylinder 1. Ignition misfires detected;
P0302 - cylinder 2. Ignition misfires detected;
P0303 - cylinder 3. Ignition misfires detected;
P0304 - cylinder 4. Ignition misfires detected.
The reason for the failure is a faulty ignition coil; after replacing the coil with a serviceable one, there is no result. Replacing candles, high-voltage wires also does not give a positive result. We will repair electronic control units of Nissan cars with a misfire problem in one or more cylinders.
Video (click to play).
There is a vulnerable IACV (idle air control valve) component in the ECCS 2 engine management system of Nissan vehicles. If it breaks down, then the HITACHI ECU fails. Symptoms such as unstable idle speed, poor start-up, or stalling after starting occur. Replacing the valve does not bring a positive result. The following errors are diagnosed in the system:
P0505 - idle speed adjustment;
P0510 - idle speed switch.
Problems can also arise with lambda probes. Computer diagnostics show the following errors:
P0135 - lambda probe bank 1, sensor 1. Open circuit heating;
P0141 - lambda probe bank 1, sensor 2. Open circuit heating.
Another case from practice. One of the copies of the car does not have a throttle control. The wiring is checked, the throttle is good. After clarification, because of what the throttle does not work, it was found out from the words of the diagnosticians:
- there is no supply of a control signal to the "Throttle control unit relay" component;
- there is no control signal supply to the “Main relay” component of EGI (Engine General Injection).
The conclusion is this - replacing the Hitachi ECU. But as we always say, in 90% of cases, the malfunction can be eliminated. The block has been restored!
We will repair electronic control units ECU, PCM of Nissan cars, we will restore electronic control units from Hitachi, Delphi, Denso, Motorola, Siemens and Bosch. We also repair and restore other ECUs of most manufacturers.
To contact us with a faulty control unit, you need collect and provide the following information.
or e-mail and get a consultation regarding the repair of electronic control units in Nissan vehicles.
Repair and restoration of ECU on requests from regions it is possible to decide without the participation of the car. ECUs are sent by regular mail, transport company or courier delivery.
The electronic engine control unit is rightfully considered one of the most important parts of the car. This device is not in vain called the "brains" of a car, because it is entirely responsible for the stability of the operation of almost all vehicle systems.
Every year more and more cars appear on the world market, the reliability and durability of which directly depends on electronic systems.Absolutely all manufacturers are trying to equip cars with the latest ECU models. Along with this, the mechanical components in the car are becoming less and less.
Be that as it may, the use of electronics in the automotive industry is fully justified. ECM manufacturers place great emphasis on the quality of materials and the assembly of their products. That is why the “brains” of a car are extremely rare. But as they say, nothing lasts forever. And even a high-quality ECU will fail sooner or later.
In a wide range of specialists, a list of the most common reasons for which an ECU breaks has long been compiled. These include:
mechanical damage. The engine control unit is damaged from shock and strong vibrations, which contribute to the appearance of microcracks in its circuits and housing;
sharp jumps in temperature, as a result of which the engine control unit itself overheats;
corrosion;
depressurization and ingress of moisture into the ECU case;
interference in the work of a block of people who do not have the necessary skills;
the so-called "lighting" from a car with a running engine;
rearrangement of terminals when connecting the battery;
starting the starter without a connected power bus.
All of the above factors affect the efficiency of the engine control unit in different ways. Some of them cause minor harm to the “brains” of the car, while others can instantly break the block. Fortunately, there is still a way to prevent the final breakdown of the unit - ECU diagnostics, which should be performed at least once a year.... This is the only way to save on expensive part repair or complete replacement.
Many drivers believe that only professionals should be engaged in checking the operation of the engine control unit. In fact, almost every “brain” at the factory is equipped with a built-in self-diagnosis system. With its help, it will not be difficult for even an inexperienced driver to identify any malfunctions with their own hands.
The engine control unit is a mini-computer that must perform specialized tasks in real time. The latter can be divided into 3 categories:
processing signals from sensors;
calculation of impacts to control vehicle systems;
adjustment of the operation of executive mechanisms.
To start checking the status of the engine control unit, we need to connect to it. This can be done using a special tester or laptop. On the latter, a program designed to read diagnostic data must be installed in advance. Modern cars are equipped with various ECU models. We will consider the implementation of diagnostics of the engine control unit using the example of the model Bosch M 7.9.7... These are the “brains” that are installed on the latest car models. VAZ and many foreign cars.
We will carry out diagnostics with our own hands using a free program KWP-D... In addition to the utility, we need an adapter that supports the protocol KWP2000... We start diagnostics by connecting the adapter. We insert one end of it into the ECU port, and the other into the laptop. After that, turn on the car ignition and start the program. A message should appear on the laptop display stating that the operation to check for errors in the operation of the ECU has begun successfully. After that, we will see a table with the most important parameters of the machine.
It is necessary to pay attention to the DTC section, which contains all the errors issued by the engine. If there are any, then go to the "Codes" section, where we will see the decryption of all existing failures. If you did not find any errors, then the engine is in perfect condition.
Other sections of the table should not be ignored either. The information in them is equally important. So, the UACC parameter is responsible for the state of the battery. Normal readings for this section are in the range of 14-14.5 V.If the voltage of your battery is less, it is worth checking the electrical circuits carefully. Another important parameter is THR, which is responsible for the position of the throttle valve. During normal idling, the throttle position sensor will read 0%. Otherwise, you should contact a specialist.
Another important indicator that interests all drivers is the QT parameter, which is responsible for the amount of fuel consumption. At idle speed, the section should contain figures of 0.6–0.9 l / h. For a more accurate diagnosis, you will need to check the voltage in the car's spark plugs. When checking all these indicators, drivers very often ignore the state of the crankshaft during rotation, for which the LUMS_W section is responsible. If the numbers in it are more than 4 rev / s, this is a sign of uneven ignition in the cylinders. It is also worth checking the high voltage wires and candles.
