Practice Test Geeks(EVT) Certified Electric Vehicle Technician Practice Test
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Diagnostics & Repair Procedures Flashcards

7 cards from real EVT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Diagnostics & Repair Procedures flashcards as text

  1. Which CAN bus identifier range is typically reserved for HV powertrain communication in an EV architecture?

    Answer: A dedicated powertrain or HV CAN bus isolated from lower-priority body networks

    HV powertrain components communicate on a dedicated high-speed CAN bus, separated from body and convenience networks to ensure message priority and integrity.

  2. A technician is performing a high-voltage system leak test after replacing a coolant fitting on the battery thermal circuit. What fluid property makes a HV coolant leak especially hazardous?

    Answer: Electrical conductivity if contaminated — the coolant used must be non-conductive (dielectric)

    EV battery coolant must be non-conductive (dielectric); a contaminated or wrong coolant can become conductive and create a shock hazard or short circuit within the battery pack.

  3. During EV motor stator winding resistance testing, a technician finds one phase reading 0.0 Ω while the others read 0.3 Ω each. What does this indicate?

    Answer: A shorted winding on the phase reading 0.0 Ω

    A reading of 0.0 Ω on one phase while others show normal resistance indicates a shorted winding, which would cause excessive current draw and motor damage.

  4. When an EV is towed after a collision, what towing method should be used if the drive wheels cannot be lifted?

    Answer: Flat-bed towing only, or use a dolly under the drive wheels

    Rolling drive wheels spin the motor and can generate back-EMF into the inverter or charge the HV battery unexpectedly; a flatbed or dolly eliminates this risk.

  5. A scan tool live data PID shows motor inverter temperature at 105°C during a performance test. The vehicle enters 'limp mode.' What is the CORRECT diagnosis?

    Answer: Inverter overtemperature protection has activated — the thermal management system or cooling circuit should be inspected

    Most inverters derate or enter limp mode at high temperatures to prevent IGBT damage; the cooling circuit (pump, coolant level, heat exchanger) must be inspected.

  6. What is the purpose of the 'service disconnect' or 'manual service disconnect (MSD)' in an EV?

    Answer: To break the HV battery circuit mid-pack, creating a safe working voltage on each side

    The MSD divides the HV battery pack into two halves, each below lethal voltage thresholds, allowing safer handling of the pack during service procedures.

  7. A technician is verifying an EV's regenerative braking system after a brake modulator replacement. Which functional test BEST confirms correct blending operation?

    Answer: Perform a controlled stop from 30 mph while monitoring regen current and wheel speed data simultaneously

    Monitoring regen current and wheel speed together during a deceleration event confirms the system is correctly blending regenerative and friction braking without wheel slip.