Run Mode

The run mode has 2 conditions called Open Loop and Closed Loop. When the engine is first started and the engine speed is above 480 RPM, the system goes into Open Loop operation. In Open Loop operation the ECM ignores the signals from the oxygen sensors and calculates the required injector pulse width based primarily on inputs from the MAF, IAT, and ECT sensors.

In Closed Loop, the ECM adjusts the injector pulse width for each bank of injectors based on the signals from each oxygen sensor.