NYC Auto Mechanic (Diesel) Exam
1. Diesel engine fundamentals
2. Fuel injection and diesel emissions
3. Air intake and turbocharging
4. Cooling and lubrication systems
5. Electrical starting and charging systems
6. Diesel diagnostics and scan tools
7. Brake and air-brake systems
8. Steering, suspension, and driveline
9. Preventive maintenance and inspection
10. NYC vehicle safety and professional responsibilities
1. In a scenario involving diesel engine fundamentals, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Assume the newest component is defective without testing.
C. Change several settings at once and record no baseline.
D. Replace every component simultaneously to save diagnostic time.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
,2. In a scenario involving fuel injection and diesel emissions, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
A. Use whichever material is available regardless of specification.
B. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
C. Skip verification because experienced workers do not need checks.
D. Begin immediately and consult instructions only if something fails.
Rationale: Preparation and verification reduce installation errors and help
control hazards.
3. In a scenario involving air intake and turbocharging, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Assume the newest component is defective without testing.
C. Replace every component simultaneously to save diagnostic time.
D. Change several settings at once and record no baseline.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
4. In a scenario involving cooling and lubrication systems, before installing or
servicing technical equipment, which practice most reduces preventable errors and
,unsafe work?
A. Skip verification because experienced workers do not need checks.
B. Use whichever material is available regardless of specification.
C. Begin immediately and consult instructions only if something fails.
D. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
Rationale: Preparation and verification reduce installation errors and help
control hazards.
5. In a scenario involving electrical starting and charging systems, during
troubleshooting, a technician finds that a system does not perform as expected.
Which method provides the strongest starting point for diagnosis?
A. Assume the newest component is defective without testing.
B. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
C. Change several settings at once and record no baseline.
D. Replace every component simultaneously to save diagnostic time.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
6. In a scenario involving diesel diagnostics and scan tools, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
, A. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
B. Begin immediately and consult instructions only if something fails.
C. Use whichever material is available regardless of specification.
D. Skip verification because experienced workers do not need checks.
Rationale: Preparation and verification reduce installation errors and help
control hazards.
7. In a scenario involving brake and air-brake systems, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Change several settings at once and record no baseline.
C. Replace every component simultaneously to save diagnostic time.
D. Assume the newest component is defective without testing.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
8. In a scenario involving steering, suspension, and driveline, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
A. Skip verification because experienced workers do not need checks.
B. Begin immediately and consult instructions only if something fails.
1. Diesel engine fundamentals
2. Fuel injection and diesel emissions
3. Air intake and turbocharging
4. Cooling and lubrication systems
5. Electrical starting and charging systems
6. Diesel diagnostics and scan tools
7. Brake and air-brake systems
8. Steering, suspension, and driveline
9. Preventive maintenance and inspection
10. NYC vehicle safety and professional responsibilities
1. In a scenario involving diesel engine fundamentals, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Assume the newest component is defective without testing.
C. Change several settings at once and record no baseline.
D. Replace every component simultaneously to save diagnostic time.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
,2. In a scenario involving fuel injection and diesel emissions, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
A. Use whichever material is available regardless of specification.
B. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
C. Skip verification because experienced workers do not need checks.
D. Begin immediately and consult instructions only if something fails.
Rationale: Preparation and verification reduce installation errors and help
control hazards.
3. In a scenario involving air intake and turbocharging, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Assume the newest component is defective without testing.
C. Replace every component simultaneously to save diagnostic time.
D. Change several settings at once and record no baseline.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
4. In a scenario involving cooling and lubrication systems, before installing or
servicing technical equipment, which practice most reduces preventable errors and
,unsafe work?
A. Skip verification because experienced workers do not need checks.
B. Use whichever material is available regardless of specification.
C. Begin immediately and consult instructions only if something fails.
D. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
Rationale: Preparation and verification reduce installation errors and help
control hazards.
5. In a scenario involving electrical starting and charging systems, during
troubleshooting, a technician finds that a system does not perform as expected.
Which method provides the strongest starting point for diagnosis?
A. Assume the newest component is defective without testing.
B. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
C. Change several settings at once and record no baseline.
D. Replace every component simultaneously to save diagnostic time.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
6. In a scenario involving diesel diagnostics and scan tools, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
, A. Review the applicable specifications, identify hazards, verify tools and
materials, and follow the required procedure. ✓
B. Begin immediately and consult instructions only if something fails.
C. Use whichever material is available regardless of specification.
D. Skip verification because experienced workers do not need checks.
Rationale: Preparation and verification reduce installation errors and help
control hazards.
7. In a scenario involving brake and air-brake systems, during troubleshooting, a
technician finds that a system does not perform as expected. Which method
provides the strongest starting point for diagnosis?
A. Verify the reported symptom, review specifications, isolate variables, and test
likely causes systematically. ✓
B. Change several settings at once and record no baseline.
C. Replace every component simultaneously to save diagnostic time.
D. Assume the newest component is defective without testing.
Rationale: Systematic troubleshooting verifies the symptom, establishes a
baseline, isolates variables, and tests probable causes.
8. In a scenario involving steering, suspension, and driveline, before installing or
servicing technical equipment, which practice most reduces preventable errors and
unsafe work?
A. Skip verification because experienced workers do not need checks.
B. Begin immediately and consult instructions only if something fails.
