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DTC Diesel Technician Certification VIP Practice Exam

DTC — This exam mirrors the ASE T2 Diesel Engines certification test administered by the National Institute for Automotive Service Excellence (ASE), which covers diesel engine diagnosis, repair, and maintenance for medium/heavy-duty trucks and equipment; the real T2 test contains approximately 55 scored questions with a 75-minute time limit and a passing score of approximately 70%.

30
Questions
75m
Time Limit
70.00%
To Pass
Question 1 of 30👑 VIP

A Class 8 truck with a turbocharged diesel engine comes in with a complaint of excessive black smoke under load but normal idle operation. A technician checks boost pressure and finds it is 8 psi at full throttle when the spec calls for 22 psi. Which of the following is the MOST LIKELY cause?

Questions 2–30 and full explanations are VIP-exclusive.