Technology & Digital Tools Flashcards

A fleet technician is reviewing freeze frame data captured with a DTC. What is the primary value of freeze frame data?

Answer: It records sensor conditions at the moment the DTC was set

Freeze frame data is a snapshot of sensor values (RPM, load, fuel trim, etc.) captured at the exact moment a DTC was triggered, aiding root cause diagnosis.

In fleet maintenance software, a 'PM schedule' is best described as:

Answer: A preventive maintenance schedule based on mileage, time, or engine hours

A PM schedule in fleet maintenance software automates reminders for preventive maintenance tasks triggered by mileage intervals, calendar dates, or engine hours.

Which fleet technology specifically monitors tire pressure across all vehicle positions and can alert the fleet management system automatically?

Answer: TPMS sensor network with telematics integration

TPMS (Tire Pressure Monitoring System) sensors transmit pressure data that, when integrated with telematics, can push low-pressure alerts directly to the fleet management platform.

A technician uses a digital storage oscilloscope (DSO) to diagnose an intermittent sensor fault. What advantage does a DSO provide over a standard DVOM?

Answer: It captures and displays waveforms over time, revealing intermittent signal faults

A DSO displays voltage waveforms over time, allowing technicians to catch intermittent signal dropouts, glitches, or pattern anomalies that a DVOM's static reading would miss.

Which network protocol is commonly used for body control modules and accessories (lights, windows, mirrors) in modern fleet vehicles?

Answer: LIN bus (Local Interconnect Network)

LIN bus is a low-cost, single-wire serial protocol commonly used for non-critical body functions like window motors, mirror adjusters, and climate control actuators.

SAE J1939 is the communication protocol most associated with which vehicle type in a fleet?

Answer: Heavy-duty trucks and diesel commercial vehicles

SAE J1939 is the industry-standard CAN-based protocol for heavy-duty commercial vehicles, governing communication between engine, transmission, ABS, and body controllers.

When a fleet management system reports 'idle time' for a vehicle, this data is most directly sourced from:

Answer: OBD-II/telematics engine-on versus vehicle speed data

Telematics units detect idle time by reading the engine-running status from OBD-II or ignition sense while vehicle speed remains at zero.