EGR monitors are being discussed. Technician A says some EGR system monitors EGR flow by measuring the difference in pressure as the EGR gas flows through an orifice (restriction). Technician B says some EGR monitors measure the temperature of the EGR outlet to determine whether there is gas flowing through the EGR valve. 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. Technician A is correct in stating that some EGR systems monitor flow by measuring the difference in pressure across an orifice, which is a common method to determine flow rate. Technician B is correct in stating that some systems measure the temperature at the EGR outlet, as the presence of EGR flow will typically cool the exhaust gases, providing an indirect measure of flow.

EGR Monitors Are Being Discussed