3.1.13-6
CS35 2013.04
3.1.13-6Electronic Control System - ME7
Idle Speed Control
The control system can keep the stability of the engine basic idle speed through ECM controlled
electronic throttle, but the engine idle speed will change for the following reasons.
• Add load to the engine (for example, open A/C switch when adding electric load).
• Engine itself changes over time.
• Improve the starting performance of the engine.
• Adjust the air - fuel ratio during deceleration (reduction buffer function).
• When engine warm-up, improve its performance.
Operation:
Idle speed control is based on ECM effective output information, ECM inspects the engine operating
status through the signals of various sensors and switches and controls the air flow by controlling the
throttle opening through machinery throttle.
When the vehicle is stopped, the throttle is at idle position and the engine is at running state, at this time
the engine speed is kept at specified idle speed.
The signal of the reduced injection quantity
The signal of the increased injection quantity
High voltage
Low voltage
The reduced concentration of oxygen
The increased concentration of oxygen
ECU
Fuel injector
The air-fuel ratio thin
The air-fuel ratio thick
Oxygen sensor
A3113002
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