Two technicians are discussing exhaust gas recirculation diagnostics. Technician A says that when diagnostic codes are set, the ECM will disable the EGR operation. Technician B says that significant differences between a sensed EGR control vacuum and a commanded vacuum signal will trigger diagnostic trouble codes. Who is right?
A)A only"
B)B only"
C)Both A and B
D)Neither A nor B"

Question

Quizplus · Accepted Answer

Technician A is correct because the ECM may disable the EGR system when diagnostic codes are set to prevent further issues. Technician B is also correct because discrepancies between the sensed and commanded EGR vacuum can trigger diagnostic trouble codes.

Two Technicians Are Discussing Exhaust Gas Recirculation Diagnostics