Answer :
In conclusion, Technician B is more correct than Technician A. While Technician A's statement is partially accurate, Technician B's statement better reflects the general control mechanism of fuel pumps in late-model vehicles.
Technician A and Technician B have different statements regarding the control of fuel pumps in vehicles.
Technician A states that on some vehicles, the fuel pressure is monitored by a fuel rail pressure sensor, and the output of the fuel pump is controlled by the Powertrain Control Module (PCM) through pulse-width modulation.
Technician B claims that all fuel pumps on late-model vehicles are controlled by the PCM based on inputs received on the Controller Area Network (CAN) bus and other specific sensors.
To determine who is correct, we need to evaluate both statements.
Technician A's statement is partially correct. Some vehicles do indeed have a fuel rail pressure sensor that monitors the fuel pressure. However, the claim that the output of the fuel pump is controlled by the PCM through pulse-width modulation is not universally applicable to all vehicles. While some vehicles may use this method, it is not the only way fuel pumps are controlled.
Technician B's statement is more accurate. Late-model vehicles typically rely on the PCM to control the fuel pump based on inputs received from various sensors, including those on the CAN bus. The PCM uses this information to regulate the fuel pump's operation.
In conclusion, Technician B is more correct than Technician A. While Technician A's statement is partially accurate, Technician B's statement better reflects the general control mechanism of fuel pumps in late-model vehicles.
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