Question

Tech a says that the oxygen sensor is part of the feedback system for the engine management system. tech b says that long-term fuel trims that are positive

means that the pcm is leaning out the fuel mixture from the base pulse-width setting who is correct?
o tech a
o tech b
o both a and b
o neither a nor b

Answer 1

Both Tech A and Tech B are correct. The oxygen sensor is indeed a part of the feedback system for the engine management system. The oxygen sensor measures the amount of oxygen in the exhaust gas and sends this information to the powertrain control module (PCM). Based on this information, the PCM can adjust the fuel mixture to ensure that it is optimally balanced for the current driving conditions.

Long-term fuel trims refer to the adjustments that the PCM makes to the fuel mixture over an extended period of time. Positive long-term fuel trims indicate that the PCM is leaning out the fuel mixture by reducing the amount of fuel injected into the engine. This is typically done in order to compensate for a condition that is causing the engine to run rich (too much fuel in the mixture).

Step-by-step explanation: