【Fault description】
    Start the engine after a few seconds self-flame, turn off after the start, a few seconds after the self-flame.
    【Inspection process】
    The engine in the process of driving the fault light is not lit, extract the fault code for the normal code, thus eliminating the failure of the electronic control system, measuring fuel pressure is normal, but after the engine starts measuring fuel pressure, gradually reduced to zero after a few seconds, Of course the engine will turn off. Will test the terminal "FP" and "B" shorted, start the engine after all the normal, then use the test lamp to check the pump plug voltage and found a few seconds before the flame out of the bulb, and then check the pump ECU connector, Measured by the computer came the oil pump control signal, starting at 5.0v, idle at 25V, the signal voltage is normal, and 25V signal in the engine after the flame is gone, thus the fuel pump control signal is normal, the cause may be due to oil pump ECU , So the replacement of another is driving the same model car pump ECU, installed after the test, the fault remains the same. Again check the line and found the pump ECU 12V power cord in the start after a few seconds down to 0, along the line check and found a fuse box below a socket loose, plug it, start the engine, the car is no longer self-flame, failure exclude.
    【Maintenance】
    In the maintenance of EFI engine, maintenance personnel are often easy to ignore the power and take the line of inspection, the computer must work in the normal supply of adequate voltage and good grounding, other electronic controllers should meet the same conditions, Line use their own shell, and no green line, which should be in the maintenance must pay attention to, while others are poor power supply problems, the problem more in the power supply line, which in the detection of digital multimeter check the battery voltage With the computer, electronic control voltage is consistent. In short, the computer in the output of the normal code in the case of power and check the line, may be able to find the real cause of the failure.