ECU is engine control unit for short. It is the central controller and heart of the engine management system. It controls the fuel supply, air management, fuel injection and ignition. Due to the scalability of its performance, the control unit is also able to control the exhaust system as well as to integrate transmission and vehicle functions.


The working voltage range of the ECU is generally 6.5-16V (with a voltage stabilizing device at key points inside), the working current is 0.015-0.1A, and the working temperature is -40°C~80°C. It can withstand vibration below 1000Hz, so the probability of ECU damage is very small. The CPU is the core part of the ECU. It has the functions of calculation and control. When the engine is running, it collects the signals of each sensor, performs calculations, and calculates The result is converted into a control signal to control the work of the controlled object. It also controls the memory (ROM/FLASH/EEPROM, RAM), input/output interface (I/O) and other external circuits; the program stored in the memory ROM is written based on the data obtained through precise calculation and a large number of experiments When the engine is working, this inherent program is constantly compared and calculated with the signals collected from various sensors. Use the results of comparison and calculation to control multiple parameters such as engine ignition, air-fuel ratio, idle speed, and exhaust gas recirculation

Self-diagnostic function

ECU generally has fault self-diagnosis and protection functions. When the system fails, it can also automatically record fault codes in RAM and use protection measures to read alternative programs from the above-mentioned inherent programs to maintain engine operation. At the same time, these fault information will be displayed on the instrument panel and remain indelible, which can enable the car owner to find the problem in time and drive the car to the repair shop.

Adaptive Functions

Under normal circumstances, RAM will also keep recording your driving data, which becomes the learning program of ECU and provides the best control state to adapt to your driving habits. This program is also called adaptive program.

ECU modification

ECU modification Modification of ECU is to achieve the purpose of changing the engine operation by changing the method of dealing with problems (the original ECU program). The so-called "ECU program" is actually a set of algorithms, which are stored in the memory, and process and generate corresponding command signals from the signals converted from the input devices through the controller, which are then transmitted from the output devices. Therefore, our modification of ECU parameters is actually modifying the algorithm.

Diselmart offer different ECUs for Volvo, Caterpillar, Perkins, Komatsu, Hitachi and other brands.

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