System Description

SYSTEM DESCRIPTION 

ECM conducts feedback control of the engine idle speed to the target value, by controlling intake air volume with electric throttle, according to driving conditions such as engine warm-up condition, A/C loads, electric loads, etc.

IDLE SPEED FEEDBACK 

ECM determines control target value based on the engine coolant temperature, A/C operation status, gear position, etc., then conducts feedback control to match the target value when idle judgment is made with transmission range switch signal ON, or when the vehicle speed is very low. Also, adjustment of the engine idle speed is conducted by ECM's self learning (IDLE AIR VOLUME LEARNING).

CORRECTION OF BATTERY VOLTAGE 

When battery voltage becomes lower than specified value, ECM corrects the target value to improve battery charging.

OTHER CORRECTIVE CONTROLS 

• When some electric load (power steering load, electric load, etc.) is turned ON, ECM controls target engine speed for each load accordingly.
• When gear position is selected (N→D, D→N), ECM controls the engine speed by optimizing throttle opening to minimize shift shock.
• When deceleration (accelerator pedal ON→OFF), ECM controls the engine speed by optimizing throttle opening to minimize shift shock and exhaust gas emission.