Attention! When removing and applying voltage, the following conditions must be observed:
- when disconnecting the battery, the data of the ECU-ECU malfunction memory are lost, therefore, before disconnecting it, one should read the information from the malfunction memory, check the recorded malfunction messages and, after troubleshooting, erase them;
- dock (insert) and disconnect plug connections (ShS) should only be done when the ignition is off, the control panel is removed.
- when removing and installing parts, relays, fuses, etc., fault codes can be recorded in the fault memory of the ECCM with self-diagnosis, therefore, after completing work related to electrical equipment, always query the fault memory;
- Check the recorded fault messages and delete them after rectifying the fault.
When replacing the ECU KSUD, you must pay attention to the following:
- in each case must be read using «DIS tester» the level of software and hardware of the corresponding ECU-KSUD and vehicle units, according to the Manual for the system «DIS» by subsection «Coding» And «Programming»;
- the memory of each block contains certain values that represent the base values. Depending on the state of the engine, the ECU receives different values of input signals. The adaptive control system compares the values of the input signals with the base (programmatic) values stored in memory, and generates commands to the executive bodies;
- if the ECU is in a de-energized state for a long time (more than one hour), then the adaptive control system loses the values stored in the memory;
- when connecting a new ECU or an ECU with erased information, the adaptive control system itself must read the values of the input signals of the corresponding engine and save them as new base values;
- this operation after starting the engine may cause uneven idling and failures when coasting, depending on the characteristics of the engine, this period may be different;
- before installing a new or replacing an old computer, you should, if possible, warm up the engine to operating temperature;
- after installing the computer, let the car engine run at different crankshaft speeds.