Operation Section
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(7) Other Injection Quantity Control
Idle Speed Control (ISC) System
• The idle speed control system controls the idle speed by regulating the injection quantity in order to match the actual
speed to the target speed calculated by the computer. The ISC can be automatic ISC or manual ISC.
Automatic ISC
- With automatic ISC, the engine ECU sets the target speed. The target engine speed varies with the type of trans-
mission (automatic or manual), whether the air conditioner is ON or OFF, the shift position, and the coolant temper-
ature.
Idle Speed Control Conditions
Conditions When Control Starts Conditions Affecting Control
· Idle Switch
· Accelerator Opening
· Vehicle Speed
· Water Temperature
· Air Conditioning Load
· Shift Position
Engine ECU
Target Engine Speed Calculation
Comparison
Fuel injection Quantity Correction
Actual Engine Speed
Actuators
Fuel Injection Quantity Instruction
Q000900E
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