ASE T2 DIESEL ENGINE TEST |ACTUAL
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
Which of the following should be done after installing a new copper injector sleeve?
A. Heat it
B. Dress it
C. Ream the seat
D. Coat it with a looking compound
CORRECT ANSWER
C. Ream the seat
(This reaming ensures there will be a good clean area for the injector to seal against)
Question 2
A diesel engine has oil in the radiator. Which of the following would be the cause?
A. Cracked piston cooling nozzle
B. Cracked oil cooler
C. Restricted turbocharger drain line
D. Restricted exhaust gas recirculation (EGR) cooler
CORRECT ANSWER
B. Cracked oil cooler
( A cracked oil cooler will allow the oil into the cooling system; thus, oil would get in the
radiator.)
1
,Question 3
A diesel engine has bubbles flowing in the clear bowl on the fuel/water separator.
Technician A says this is caused by a restricted fuel return line. Technician B says this is
caused by leaks on the return side of the fuel system. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
CORRECT ANSWER
D. Neither A nor B
(Bubbles flowing the separator indicate an air leak on the suction side of the fuel
system.)
Question 4
A truck has been sitting for 12 hours. Which of the following open-circuit voltages would
indicate a fully charged battery?
A. 11.6 volts
B. 12.0 volts
C. 12.6 volts
D. 13.0 volts
CORRECT ANSWER
C. 12.6
(A fully charged battery should have an open-circuit voltage of 12.6 volts.)
2
, Question 5
The engine oil pressure gauge fluctuates greatly. All of the following be the cause EXCEPT:
A. The oil pan is overfilled
B. The oil pickup tube is loose
C. The wrong engine oil was installed
D. The oil pressure sensor is failing
CORRECT ANSWER
C. The wrong engine oil was installed
( The incorrect oil may not provide proper lubrication, but it will NOT cause great
pressure fluctuations)
Question 6
The engine brake will occasionally come on when pulling a hill. Technician A says the
clutch switch may be faulty. Technician B says the master switch may be faulty. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
CORRECT ANSWER
D. Neither A nor B
(If the engine brake engages while pulling a hill, the most likely problem is with
accelerator pedal position sensor.)
3
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
Which of the following should be done after installing a new copper injector sleeve?
A. Heat it
B. Dress it
C. Ream the seat
D. Coat it with a looking compound
CORRECT ANSWER
C. Ream the seat
(This reaming ensures there will be a good clean area for the injector to seal against)
Question 2
A diesel engine has oil in the radiator. Which of the following would be the cause?
A. Cracked piston cooling nozzle
B. Cracked oil cooler
C. Restricted turbocharger drain line
D. Restricted exhaust gas recirculation (EGR) cooler
CORRECT ANSWER
B. Cracked oil cooler
( A cracked oil cooler will allow the oil into the cooling system; thus, oil would get in the
radiator.)
1
,Question 3
A diesel engine has bubbles flowing in the clear bowl on the fuel/water separator.
Technician A says this is caused by a restricted fuel return line. Technician B says this is
caused by leaks on the return side of the fuel system. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
CORRECT ANSWER
D. Neither A nor B
(Bubbles flowing the separator indicate an air leak on the suction side of the fuel
system.)
Question 4
A truck has been sitting for 12 hours. Which of the following open-circuit voltages would
indicate a fully charged battery?
A. 11.6 volts
B. 12.0 volts
C. 12.6 volts
D. 13.0 volts
CORRECT ANSWER
C. 12.6
(A fully charged battery should have an open-circuit voltage of 12.6 volts.)
2
, Question 5
The engine oil pressure gauge fluctuates greatly. All of the following be the cause EXCEPT:
A. The oil pan is overfilled
B. The oil pickup tube is loose
C. The wrong engine oil was installed
D. The oil pressure sensor is failing
CORRECT ANSWER
C. The wrong engine oil was installed
( The incorrect oil may not provide proper lubrication, but it will NOT cause great
pressure fluctuations)
Question 6
The engine brake will occasionally come on when pulling a hill. Technician A says the
clutch switch may be faulty. Technician B says the master switch may be faulty. Who is
correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
CORRECT ANSWER
D. Neither A nor B
(If the engine brake engages while pulling a hill, the most likely problem is with
accelerator pedal position sensor.)
3
