Short-term and long-term fuel trim readings are being discussed. Technician A says a scale of 0 to 255 is used. Technician B says percentage is used. Who is correct?

Question

Quizplus · Accepted Answer

Fuel trim values are typically represented as percentages, not on a scale of 0 to 255. This percentage indicates how much the fuel delivery is being adjusted from the base programmed amount in the vehicle's engine control module (ECM) to maintain an optimal air-fuel ratio.

Short-Term and Long-Term Fuel Trim Readings Are Being Discussed