Outline Of Diagnosis
WARNING: This page is about a different variant/trim than selected.
Detect the malfunction of AAI solenoid valve.
Intake manifold pressure (negative pressure) is constant because the throttle valve is fully closed during fuel cut at deceleration. At this time, opening AAI solenoid valve makes the intake manifold pressure larger. For AAI solenoid valve function diagnosis, judge OK or NG by the amount of change of intake manifold pressure when opening and closing the AAI solenoid valve.
Max. value with the valve open - Min. value with the valve closed < Threshold value → NG
Max. value with the valve open - Min. value with the valve closed > Threshold value ← OK