Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Volkswagen >> 1996 >> Passat GLS, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - Diesel >> Computerized Engine Controls >> Electronic Idle Speed Control

Electronic Idle Speed Control

Engine speed sensor sends an alternating voltage to ECM. ECM processes idle speed signal and compares actual reading with a preset specification.

Idle speed is held constant by electromagnetic actuator, independent of engine load. When engine coolant temperature is less than 140°F (60°C), ECM increases idle speed to a preset specification.

scientia non olet · About Mike's Workshop Manuals