50
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:
Figure 3-31 Idle speed control valve test
Summary of Contents for ATO1000 Series
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Page 2: ...Version Info Version Date Remarks V1 0 2020 06 ...
Page 52: ...Chapter 3 Automotive Test 49 Figure 3 30 Electronic fuel pump test ...
Page 71: ...68 Figure 3 49 K line test ...
Page 79: ...76 Figure 3 57 Mazda 6 Cylinder internal pressure measurement ...