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. When diagnosing an EV that shows a high-voltage interlock loop (HVIL) fault, what is the FIRST step a technician should take?

    Answer: Verify all HV connectors are fully seated and service plugs are installed

    An HVIL fault typically indicates an open circuit in the interlock loop, often caused by an unseated HV connector or removed service plug.

  2. An EV's onboard charger (OBC) is not accepting AC power. After confirming the EVSE output is correct, what should the technician check next?

    Answer: AC inlet pilot signal and proximity detection circuits

    The pilot signal and proximity detection circuits between the EVSE and OBC must be within spec for the OBC to enable charging.

  3. A technician measures isolation resistance on an EV HV system and gets 150 kΩ. What does this indicate?

    Answer: A serious isolation fault requiring immediate HV system inspection

    Acceptable HV isolation resistance is typically above 500 kΩ (often 1 MΩ+), so 150 kΩ indicates a serious isolation fault requiring inspection.

  4. Which tool is used to confirm HV bus capacitors are fully discharged before working on an EV drive system?

    Answer: Calibrated high-voltage rated digital multimeter

    A calibrated high-voltage rated DMM is required to verify that HV bus voltage has dropped to a safe level (typically below 60V DC).

  5. An EV shows reduced regenerative braking performance. Which component failure is MOST likely responsible?

    Answer: Degraded HV battery state-of-charge acceptance (high SOC)

    Regen braking requires the HV battery to accept charge; if the battery is near full SOC or has degraded acceptance, regen performance is reduced.

  6. When performing a motor resolver calibration on a permanent magnet AC motor, what is the purpose of this procedure?

    Answer: To align the resolver's electrical zero position with the rotor's magnetic pole position

    Resolver calibration ensures the inverter knows the exact rotor position relative to the stator to achieve efficient torque control.

  7. A BMS fault code indicates 'cell voltage imbalance exceeds threshold.' What is the BEST corrective action?

    Answer: Perform a cell balancing cycle via the BMS and retest

    Many BMS systems support passive or active cell balancing routines that can reduce imbalance before determining if physical cell replacement is needed.