Oxygen (Sensor) Control

Oxygen content of exhaust gases is detected by the oxygen sensor located in the exhaust manifold. This sensor converts the percentage of oxygen present in exhaust gases into an electrical signal that is transmitted to the DME/Motronic control unit.

The DME/Motronic control unit uses this information to determine air/fuel ratio, and adjusts injector timing (pulse width) to obtain a 14.7:1 air/fuel ratio. Oxygen sensor signal (closed loop mode) is also used for regulation of fuel tank (evaporative) control valve.

If fault code is set or if the oxygen sensor is malfunctioning, the DME/Motronic control unit will operate engine at an oxygen sensor substitute value of .45 volt.