Hello everyone, I agree with Ismael53 that you have to take an order in the diagnosis. But if one looks good at the diagnostic procedures developed by manufacturers in obd injection systems, they first recommend consulting the breakdown memory, in fact Wichopit expresses that I disconnect the bacteria and that the codes were not erased. In fact in OBD systems! 10 minutes of disconnected bacteria are enough to erase everything in the ECU, which are immediately thickened after my experience that the codes have not been erased. The other if you do not take the obd in which, the work of measuring everything is huge, the system is designed like this, saves time in the diagnosis. Then if there are no codes, you will check what ECU cannot detect in its circuits, compression, draft, pump pressure etc. In my opinion founded in experience, the OBD system should not be looked at as a complication, if not the opposite, an invaluable help when determining a system with failures. That the system has several codes should not be reason not to take into account the problems detected by the ECU in circuits that it monitors and controls. greetings.