Idle Speed Control Monitoring

COMPREHENSIVE COMPONENT MONITORING

IDLE SPEED CONTROL MONITORING

Idle speed control rationality diagnosis

General Description:
This diagnosis detects the stability of the idle speed. If the commanded idle speed and the actual idle speed is not within a calibratable value, above or below commanded, in spite of an activated idle speed controller the idle speed is considered to be out of range. If the deviation is > threshold, the idle speed controller monitor would detect a fault. The evap monitor is not disabled continuously, only for the time the rpm value of ± 150 exceeded.

If the above failure conditions are detected, the appropriate DTC will be stored.

Within this diagnosis is also defined an interface between the idle speed control and the 'Rate-Based Monitoring statistics'.

Flowchart: Idle speed control rationality diagnosis