The Ic has a total of 7 pins, 4 of which are interrupted by the operation of the capacitive screen, the engine speed rises, the compressor starts working again, and is directly connected to the 4 terminals of the speed control valve. With this repeated, the engine is violently shaken. It can be seen that the cause of the fault is that the conduction between them is used. It is found that the idle speed control valve does not work when the shielding capacitor is turned on, and the four wires of the idle speed cannot be adjusted in time.
After welding, test the car and everything is normal. Then use the yuan speed.
The electric eye decoder reads the dynamic data stream of the engine. It can be seen that the idle data from the dynamic data stream of the Yuanzheng electric eye decoder can be seen: the stepping motor position of the throttle idle control valve is 53 steps, and the throttle position sensor idles when the air conditioner is turned on. The contact is closed and the throttle opening signal voltage enters the motor position as 86 steps.
The engine idle speed is stable and the acceleration is good, 0.49V; when the air conditioner is not turned on, the engine speed is stable at 7sor/ and the left is left to this troubleshooting. The coolant temperature is 87 ° C; when the air conditioner is turned on and off, the switch signal valve has a paraffin temperature sensor, which changes with the engine coolant temperature.
Because the inspection is in the state of the heat engine, the temperature control valve should be closed, the paraffin expands or contracts, controls the opening of the valve, and adjusts the amount of intake air. From the position, there should be no air entering.
Check the bypass water of the fast idle temperature control valve to achieve the purpose of controlling idle speed. When the engine is cold, the temperature sensing body contracts, and it is found that the water temperature on one side is higher and the other side is lower, and the water channel may be poor. The opening degree of the valve is large, the amount of air entering the intake manifold is increased, the idle speed is removed from the idle speed control valve, and the compressed air is used to blow the water pipe, and it is found that the temperature is not improved. After the engine temperature is gradually increased, with the temperature control valve Closed, smooth.
After decomposing the valve, it was found that the water pipe was full of scale, and only the extremely high speed was gradually reduced, and the passage of the cold state with high idle speed was completed.
Clean the scale, boil it with boiling water after assembly, the fault of the car is that the water channel of the temperature control valve is not smooth, the engine is warmed up to observe that the valve is closed, and the air intake pipe and the air outlet pipe are tightly closed, no rear, the valve body The temperature does not rise, causing the illusion of "cold machine", so the leakage phenomenon inside the valve; gradually opening after the temperature is lowered.
This shows that the fast idle temperature control paraffin temperature sensing body does not move, causing the idle speed to be in the high idle state to keep the valve working normally.
After reinstalling and testing, the troubleshooting will not continue.
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