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 logic when determining when to set a DTC and illuminate the MIL. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct that the fuel system monitor may not be allowed to run if a pending code is stored. This is because some pending codes can affect the results of the fuel system monitor, leading to inaccurate readings. 
Technician B is also correct that the comprehensive component monitor will use one-trip logic when determining when to set a DTC (diagnostic trouble code) and illuminate the MIL (malfunction indicator lamp). One-trip logic means that if a fault is detected during a single drive cycle, a DTC will be set and the MIL will be illuminated.

Technician a Says the Fuel System Monitor May Not Be