Symptom: An annual output of 2.3L Guangzhou Honda Accord sedan, in the driving step on the brake pedal, 10 times at least 3 times the flame. Before the car road test, driving all normal, when the speed of more than 30km / h, as long as a fierce brake pedal, the engine will certainly turn off. And in the low speed or high speed light step on the brake pedal, often will not turn off.
    Troubleshooting: According to maintenance experience, the reasons for this failure: First, the brake system vacuum booster device on the intake pressure signal interference, resulting in engine flameout; Second, the brake when the automatic transmission lock system is still in the locked state , The drive wheel on the engine crankshaft rotation to form a reaction force, causing the engine to turn off.
    The vacuum system to help the exhaust system from the trachea removed, and then blocked the intake pipe, road test. Simulate the fault state, if the problem lies in the vacuum power to get the gas system and related parts, then the test failure should disappear completely. Since the intake pipe interface has been blocked, the vacuum booster or brake system will not interfere with the operation of the engine.
    However, when the test, the fault is not only not ruled out, the frequency of brake flameout but higher than the original, it seems that from the automatic transmission to find the root causes of failure.
    Braking in the running, if the torque converter within the lock-up clutch has been in a locked state, will cause the transmission spindle and the engine crankshaft at the same speed rotation, step on the brake pedal, and did not cut off between the engine and the transmission Contact, in the wheel tends to stop the process of the process, the engine will be from the drive wheel reaction torque, resulting in the engine load is too large and flameout.
    With the car Boshi A2600 connected to the diagnostic plug, the indicator light shows no fault code. Note that the lock control system circuit part no problem. Check the automatic transmission oil, clean and pollution-free, after stall test and hydraulic test, did not find any exception.
    Machinery, the circuit is no problem, after careful consideration, decided to start from the oil inspection.
    After releasing the fuel pressure, connect the pressure gauge to the screw pulse damper interface, and check that the fuel pressure is 280 kPa in the standard range. Sudden braking, the system pressure quickly dropped to zero, followed by the engine flameout, it appears that the reason for the flame must be blocked on the fuel pump filter.
    Demolition of the fuel tank, the bottom of the fuel tank deposited a lot of dust and sediment. Brake fuel tank internal organs under the action of inertia rolling, plug the fuel pump filter, the system oil pressure drop, the engine flameout.
    Thoroughly clean the fuel line, replace the gasoline filter, test again, the phenomenon disappeared.