Question

diagnostic trouble codes (dtcs) and the malfunction indicator lamp (mil) are being discussed. technician a states that when a one - trip dtc sets, the mil is illuminated immediately. technician b states that if a catalyst damaging fault occurs, it will turn the mil red rather than yellow. who is correct? a. technician a b. technician b c. both technician a and technician b d. neither technician a nor technician b

Explanation:

• Technician A: One - trip DTCs do not immediately illuminate the MIL. The MIL typically illuminates after two consecutive trips (in - use tests) for non - catalyst damaging faults.
• Technician B: The MIL is usually yellow. There is no standard for it to turn red for catalyst - damaging faults in the general vehicle diagnostic system context.

Answer:

d. Neither Technician A nor Technician B