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94
3.3.5 Idle speed control valve
The idle speed control valve adjusts the throttle position or forms an air bypass around the engine according to the
load conditions of the engine and the engine temperature to deliver controllable airflow to the air duct to adjust the
engine idle speed. For gasoline vehicles, generally when the engine is cold started , The engine speed will rise
rapidly to about 1200 rpm. When the engine reaches the normal operating temperature, the idle speed will gradually
decrease, and finally stabilize at the preset value.
Use ATO oscilloscope to test the idle speed control valve, the specific operation is as shown in Figure 3-31:
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