ASE Diesel Practice Test Questions and Answers well Explained Latest 2024/2025 Update 100% Correct.
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Course
ASE Diesel
Institution
ASE Diesel
The tandem rear axle air suspension ride height rises above normal as the vehicle is unloaded. Which of
these could be the cause?
(A) A kinked air spring (bag) supply line
(B) A leaking height control valve (C) A plugged height control valve exhaust port
(D) A leaking pressure protection valve ...
ASE Diesel Practice Test
The tandem rear axle air suspension ride height rises above normal as the vehicle is unloaded. Which of
these could be the cause?
(A) A kinked air spring (bag) supply line
(B) A leaking height control valve (C) A plugged height control valve exhaust port
(D) A leaking pressure protection valve - C
The parking brakes fail to apply on a truck with air brakes. Technician A says that low air pressure in the
spring brake chamber could be the cause. Technician B says that a ruptured spring brake diaphragm
could be the cause. Who is right?
(A) A only
(B) B only
(C) Both A and B
(D) Neither A nor B - D
A diesel engine has excessive black smoke when started in the morning. Which of these could be the
cause?
(A) A bad fuel injection nozzle
(B) A restricted fuel filter
(C) A blocked fuel tank vent
(D) A leaking fuel return line - A
Which of these can cause a no-start condition on a HEUI engine?
(A) High fuel pressure
(B) Low injection control pressure (C) High boost pressure
(D) Low boost pressure - B
A diesel engine is hard to start, but runs good after it has been primed and run for a few minutes. The
most likely cause is a:
, (A) leaking injector line.
(B) leaking fuel return line.
(C) plugged fuel tank vent.
(D) bad transfer pump check valve. - D
A diesel engine with wet liners has been running too hot, and there is coolant in the crankcase. The most
likely cause is:
(A) a cracked block.
(B) cracked liners.
(C) leaking liner seals.
(D) a leaking injector seal. - C
Diesel engine cylinder liner protrusion (height) can be adjusted by selecting the correct size:
(A) cylinder liner.
(B) head gasket.
(C) liner shim.
(D) fire ring. - C
An electronically-controlled diesel engine will not start. Any of these could be the cause EXCEPT a failed:
(A) camshaft position sensor.
(B) engine control module (ECM). (C) ECM ground circuit.
(D) throttle position sensor (TPS). - D
When a diesel engine is operated under a load, coolant continually comes out of the radiator overflow
and there are bubbles in the radiator. Which of these is the most likely cause?
(A) Too much coolant in the cooling system
(B) A clogged radiator
(C) A stuck-open thermostat
(D) Compression leakage into the cooling system - D
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