Exam 52: Troubleshooting and Diagnostics

Technician A says that when EGR flow rates are high, the result may be excessively high exhaust temperatures. Technician B says that any time exhaust temperatures are excessively high, the cause must relate the breathing circuit downstream from the engine cylinder. Who is correct?

What is the most likely result of a diesel engine with too much oil in the sump?

You are checking a boosted diesel air intake system for inlet restriction using a negative pressure gauge. Which of the following would be the typical maximum acceptable spec reading on the gauge?

When troubleshooting the cause of low oil pressure readings on a dash gauge, which of the following should be done first?

What is a common cause of injector scuffing?

Technician A says that a low oil pressure reading can be caused by insufficient oil in the crankcase. Technician B says that a low oil pressure reading can be caused by excessive oil in the crankcase. Who is correct?

A diesel engine produces a vibration complaint. Which of the following would be the more likely cause?

Which of the following can cause abnormally high DPF intake temperatures?

What is the function of the OEM district service manager (DSM) in the repair cycle??

How should a cylinder misfire be checked out on an electronically-controlled fueled diesel engine?

-If an engine is leaking coolant into its cylinders, which of the following would most likely result?

A diesel engine is emitting black smoke, especially under load. Which of the following should be performed first?

Blue smoke emission from a truck diesel engine is usually caused by:

What color smoke is associated with diesel engine start-up in extreme cold weather conditions?

What does HD-OBD specifically mandate?

When troubleshooting an electronic problem on a current diesel engine, which of the following should be the most reliable source of OEM information?

When inspecting a cracked DPF core, there is evidence of scorched fuel in the substrate. What should be done after replacing the DPF?

If an engine is tested and found to be emitting high NOx, what color would the exhaust gas emission be?

If the aneroid device on a hydromechanical diesel engine has been tampered with, which of the following is more likely?

All of the following can cause a low oil pressure condition EXCEPT: