The electronic controller (ECU) is a precision device. Although many fault phenomena may be related to the ECU Common Rail Bosch Nozzle, the failure rate is very low, so do not dispose of the ECU easily, and do not open the ECU cover casually.
Circuit breakage or poor contact is a common fault in Common Rail Injector electronic control systems. In addition to faults such as disconnection of some lines and loose connectors, visual inspection can be used. The high-impedance multimeter must be used to detect the voltage and resistance of the measurement points to determine the fault location. It is not possible to check whether the line is on or off by means of scraping. Because the instantaneous voltage generated by the self-inductive coil in the circuit breaks down the Common Rail Injector Valve electronic component during the scraping.
When the ignition switch is turned on, do not disconnect any electrical equipment to prevent the induced electromotive force generated in the circuit from damaging the electronic components. When disconnecting the battery, pay attention to the following points: 1 must turn off the ignition switch; 2 check whether the self-diagnosis fault code exists; 3 keep in mind the password of the audio equipment with anti-theft code.
After the battery is disconnected, if the engine is not working as before, do not replace the parts casually, because this situation may be due to the elimination of the E-CU’s “learning correction memory” after the battery is disconnected. After the engine is running for a period of time, after the ECU automatically establishes the correction memory, the engine malfunction will automatically disappear.
When performing arc welding repair work on the vehicle, be sure to disconnect the ECU from the battery. If the welding repair is performed near the ECU, the ECU box should be removed.
