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ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam

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About this Exam

Prepare with the ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam practice quiz. This question bank includes 100 questions covering diesel, school, technician, engine, and cause. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

Sample Questions

Question 1
A school bus with a Cummins ISB diesel engine cranks normally but will not start, and the technician confirms there is no fuel reaching the high-pressure pump. Which check should be performed FIRST?
Replace the high-pressure common-rail pump
Replace all fuel injectors as a set
Increase the rail pressure relief valve setting
Inspect the low-pressure (lift/transfer) supply circuit and primary fuel filter for restriction
Question 2
Technician A says low engine compression on one cylinder can cause hard starting and a miss. Technician B says a cylinder cutout (power balance) test can help isolate a weak cylinder on an electronically controlled diesel. Who is correct?
Technician A only
Technician B only
Both A and B
Neither A nor B
Question 3
A school bus diesel produces excessive black smoke under acceleration but idles cleanly. The MOST likely cause is:
Coolant entering the combustion chamber
Worn valve stem seals
A failed cabin heater core
Insufficient air for the fuel being delivered (over-fueling/low boost)
Question 4
During a cylinder compression test on a school bus diesel, one cylinder reads significantly lower than the others. Adding a small amount of oil through the injector bore raises that cylinder's reading noticeably. This indicates:
A burned valve or damaged valve seat
A cracked cylinder head between cylinders
A leaking head gasket to the cooling jacket
Worn rings or cylinder bore (ring sealing issue)
Question 5
A school bus engine has low power and the ECM logs no active fault codes. The technician should:
Immediately replace the ECM
Perform a systematic test of air, fuel, and exhaust restriction along with rail pressure and boost data
Disconnect the EGR valve and road test
Add fuel system cleaner and return the bus to service

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Additional Information

ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on diesel, school, technician, engine, and cause. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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Frequently Asked Questions

This quiz contains a total of 100 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.

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