Technician A says the fuel system monitor may not be allowed to run if a pending code is stored. Technician B says the comprehensive component monitor will use one-trip or two-trip logic when determining when to set a DTC and illuminate the MIL, depending on the system and the detected fault. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Both statements are correct. The fuel system monitor may indeed be inhibited from running if there's a pending code, as the vehicle's onboard diagnostic system prioritizes certain conditions or faults over others. Technician B is also correct in stating that the comprehensive component monitor can use either one-trip or two-trip logic to decide when to set a Diagnostic Trouble Code (DTC) and turn on the Malfunction Indicator Lamp (MIL), depending on the specific system and the nature of the fault detected.

Technician a Says the Fuel System Monitor May Not Be