Which component uses the MAF data to properly match the fuel output vs. the air/fuel ratio table?

Which component uses the MAF data to properly match the fuel output vs. the air/fuel ratio table?

• A. O2 Sensor
• B. MAF Data
• C. PCM
• D. ECU

Answer: (C)

The computer that controls fuel delivery uses the measured amount of air entering the engine to determine how much fuel to inject by looking up the air/fuel ratio map. The MAF sensor provides the actual air mass flow, and the Powertrain Control Module uses that value to select the appropriate fuel amount from the AFR table, commanding the injectors accordingly. The O2 sensor then provides feedback to fine-tune the mixture during closed-loop operation, but it’s the PCM that performs the mapping from air flow to fuel output. In many systems, the ECU and PCM refer to the same controlling unit, but the module explicitly responsible for using the MAF data to match fuel to the AFR table is the Powertrain Control Module.

The computer that controls fuel delivery uses the measured amount of air entering the engine to determine how much fuel to inject by looking up the air/fuel ratio map. The MAF sensor provides the actual air mass flow, and the Powertrain Control Module uses that value to select the appropriate fuel amount from the AFR table, commanding the injectors accordingly. The O2 sensor then provides feedback to fine-tune the mixture during closed-loop operation, but it’s the PCM that performs the mapping from air flow to fuel output. In many systems, the ECU and PCM refer to the same controlling unit, but the module explicitly responsible for using the MAF data to match fuel to the AFR table is the Powertrain Control Module.