Technician A says that when a DTC is cleared from the PCM memory, the system readiness monitors are also cleared. Technician B says that after an emissions repair is completed, the DTCs stored should be cleared from the PCM. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Both technicians are correct. When a Diagnostic Trouble Code (DTC) is cleared from the Powertrain Control Module (PCM) memory, the system readiness monitors are reset, which is what Technician A states. Technician B is correct in saying that after an emissions repair is completed, the stored DTCs should be cleared from the PCM to reset the system and start fresh with monitoring for any further issues.

Technician a Says That When a DTC Is Cleared from the PCM