Two technicians are discussing EGR monitor. Technician A says that under the correct operating conditions, the OBD manager may briefly open the EGR valve and measure the drop in turbocharger speed against expected values. Technician B says that during monitoring, the turbocharger speed will drop because combustion temperature is cooler at low EGR flow rates. 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 OBD manager can open the EGR valve to check the drop in turbocharger speed against expected values. Technician B is incorrect because the turbocharger speed drop is not due to cooler combustion temperatures at low EGR flow rates.

Two Technicians Are Discussing EGR Monitor