CAFM Vehicle Maintenance and Repair 4 — Questions and Answers
Question 1: A fleet vehicle's engine oil analysis report shows elevated silicon levels. What does this most likely indicate?
- Normal wear from piston rings
- Dirt/dust ingestion from a compromised air filtration system (Correct answer)
- Coolant leak into the oil
- Excessive fuel dilution
Correct answer: Dirt/dust ingestion from a compromised air filtration system
Elevated silicon in oil analysis is a primary indicator of dirt ingestion, commonly caused by a damaged or improperly seated air filter.
Question 2: What is the function of a diesel particulate filter (DPF) in a fleet diesel vehicle, and what maintenance does it require?
- Filters fuel; requires replacement every 15,000 miles
- Captures soot from exhaust; requires periodic regeneration or cleaning (Correct answer)
- Filters engine air; requires cleaning every oil change
- Reduces NOx emissions; requires urea refill only
Correct answer: Captures soot from exhaust; requires periodic regeneration or cleaning
The DPF captures particulate matter from diesel exhaust and requires regeneration (burning off trapped soot) or periodic forced cleaning to prevent plugging.
Question 3: A fleet manager is evaluating whether to repair or replace a vehicle with 180,000 miles that needs a $4,500 engine repair. The vehicle's market value is $6,000. Which framework is most appropriate for this decision?
- Replace if repair cost exceeds 50% of vehicle market value (Correct answer)
- Always repair vehicles under 200,000 miles
- Replace only if the vehicle has had more than 3 repairs that year
- Repair cost divided by remaining useful life cost analysis
Correct answer: Replace if repair cost exceeds 50% of vehicle market value
The common fleet industry rule is to replace a vehicle when a single repair exceeds 50% of the vehicle's current market value, as ongoing repair costs typically escalate.
Question 4: Which of the following best describes 'predictive maintenance' in a fleet context?
- Repairing vehicles only after they break down
- Using condition monitoring data to predict and prevent failures before they occur (Correct answer)
- Following manufacturer-recommended fixed intervals strictly
- Scheduling maintenance based on driver complaints
Correct answer: Using condition monitoring data to predict and prevent failures before they occur
Predictive maintenance uses telematics, oil analysis, and sensor data to identify deteriorating conditions and schedule repairs before a failure occurs.
Question 5: A fleet vehicle experiences repeated electrical shorts in the same circuit. After replacing the fuse multiple times, what is the appropriate next diagnostic step?
- Install a higher-amperage fuse
- Trace the circuit wiring for chafing, damage, or improper grounding (Correct answer)
- Replace the entire wiring harness
- Disconnect the affected circuit permanently
Correct answer: Trace the circuit wiring for chafing, damage, or improper grounding
Repeated fuse failures indicate an underlying short circuit; the wiring must be physically traced to find damaged insulation, pinched wires, or poor ground connections.
Question 6: What is the purpose of a 'fleet maintenance benchmarking' program?
- To certify technicians on new vehicle platforms
- To compare fleet maintenance costs and performance metrics against industry peers (Correct answer)
- To set manufacturer warranty claim standards
- To establish regional fuel price benchmarks
Correct answer: To compare fleet maintenance costs and performance metrics against industry peers
Benchmarking compares a fleet's cost per mile, downtime rates, and PM compliance against industry averages or peer fleets to identify improvement opportunities.
Question 7: When using telematics data to manage fleet maintenance, which metric is most useful for scheduling engine oil changes on vehicles with highly variable duty cycles?
- Calendar days since last service
- Engine hours accumulated (Correct answer)
- Total GPS distance traveled
- Number of ignition cycles
Correct answer: Engine hours accumulated
Engine hours account for idling time which degrades oil without adding mileage, making it a more accurate service trigger for vehicles with significant idle time.
CAFM Vehicle Maintenance and Repair 4
A fleet vehicle's engine oil analysis report shows elevated silicon levels.
What does this most likely indicate?