Answer :
In the context of automotive engineering, the question is addressing the operation of the EVAP (Evaporative Emission Control) system, which is crucial for controlling fuel vapor emissions from a vehicle.
Technician A: Fuel Injector Pulse Width
Technician A mentions that the fuel injector pulse width is modulated to compensate for fuel vapors. This is correct because the onboard computer (ECU) can indeed adjust the fuel injector pulse width as part of its strategy to maintain the correct air-fuel ratio, especially when fuel vapors are being introduced into the intake system from the EVAP canister during purging.
Technician B: EVAP Purge with DTCs
Technician B states that EVAP purge can still occur if system DTCs (Diagnostic Trouble Codes) are present. Generally, this is incorrect. If there are DTCs specifically related to the EVAP system, such as leaks or component failures, the ECU often prevents purging to avoid incorrect emissions control operation until the problem is resolved.
Therefore, based on typical automotive systems behavior, Option A) Technician A is correct. Keeping the system operation efficient and within emissions regulations typically requires addressing any DTCs before allowing the EVAP purge to proceed.
