Fuel injection systems -4
4-2.9
ISC (Idle Speed Control)
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Location
ISC control method
When the engine at idle, the ECU will make reference to the other sensor signals, to calculate how much idle
bypass air and Notice to the stepper motor to control the amount of bypass air volume in order to control and
maintain the engine idle speed. ISC control method.
Instance
When the engine is cold, it may be due to idle too low and turn off, the ECU will notify the ISC into the larger
amount of bypass air. Engine fast idle operation, engine warm-up, the ECU will notify the ISC to reduce the
amount of bypass air, so that the lead Engine running at a lower speed.
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ISC control schematic
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