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A Volkswagen fast 1.6L car, the first start is very difficult every day, start also shake a few seconds to more than a dozen seconds, the cooler the weather the longer the longer, shaking after the normal. But the idle speed of the car started to swing up and down again, the hotter the temperature, the more serious the temperature, the heavy oil taste, and the occasional flameout. The fault code was "the engine control unit could not communicate occasionally", "the transmission control unit could not communicate occasionally", "the ABS control unit could not communicate occasionally", "the instrument control unit did not." "Accidental communication", "airbag control unit can not communicate accidentally". It has not been repaired in a few repair shops. How can I help you? Answer: the crash is a bit complicated. The first is "it is difficult to start every day, and it will shake for a few seconds to more than ten seconds. The longer the weather is cold and trembling, the longer it is shaking, the longer it is shaking, it is normal". This should focus on the water temperature sensor signal, you can use the equipment to read the data flow, choose the cold car to see the diagnosis instrument display the temperature of the hair, if the diagnostic instrument shows the water. If the temperature is higher than the actual water temperature, you need to replace the water temperature sensor to eliminate the fault. If the water temperature is in accordance with the actual water temperature, it is necessary to solve the problem by clearing the combustion chamber, the intake valve and the coke in the intake port. As for "the idle speed of the car after the warm car starts to swing up and down, the hotter the weather is, the more serious the oil is, the taste of the oil is very heavy". It is necessary to check the carbon tank discharge system and replace the carbon tank and the electromagnetic valve to exclude the fault. The last few fault codes, such as the "mass casualties" fault, is generally a failure on the CAN network bus. CAN network bus fault manifestation is two points: one is "group dead group", two is "the wind horse cow is not the same", the fault is mainly three points: one is the power supply, the two is the node, and the three is the link. It is necessary to check the power supply first, then no communication can be done without electricity; the two is the node, that is, any module in the network will also be short circuited; and the three is the line contact problem. If the power supply is normal, the module can be extracted one by one, and which module will be normal after the system is extracted.