EVT Study Guide 2026

ISO 6469 is the international standard specifying electrical safety requirements for electrically propelled road vehicles, covering HV wiring, isolation, and protection measures.

Energy density in batteries refers to the amount of energy a battery can store per unit of volume (Wh/L) or per unit of mass (Wh/kg). A higher energy density means the battery can store more energy in a smaller or lighter package, which is crucial for electric vehicles to achieve longer ranges without excessive weight.

Safety standards in EV maintenance are paramount due to the high voltages and unique components involved. Adhering to these standards, which include proper lockout/tagout procedures, personal protective equipment (PPE), and specialized tools, is crucial for preventing electric shock, arc flash incidents, and damage to expensive EV components. Ultimately, these standards protect both technicians and the vehicle itself.

LOTO procedures physically lock the MSD in the removed position and apply a tag, preventing any other person from re-energizing the HV system while a technician is actively working on it.

Intermittent faults are challenging because they don't occur consistently, making direct diagnosis difficult. The most effective approach is to use data logging to capture system parameters when the fault does occur and then attempt to replicate those specific conditions in a controlled environment. This systematic method helps pinpoint the root cause by observing the system's behavior during the fault's manifestation.

Proactive hazard identification and assessment allows professionals to identify and mitigate risks before incidents occur, which is far more effective than reactive approaches that only address problems after they happen.