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Moisture reduces insulation resistance, triggering isolation faults. ASE L3 emphasizes sealing and insulation integrity checks for HV packs. Belts, throttle, or ignition components are not related.

When HV batteries lose capacity, they cannot maintain voltage under load, reducing EV range. ASE L3 highlights identifying signs of capacity loss and interpreting scan tool data to confirm degradation. Throttle bodies, lug nuts, or injectors do not directly affect HV pack voltage.

When cell imbalance is detected, the first ASE-recommended diagnostic step is to measure individual module voltages to confirm differences. This isolates weak modules. ICE fuel, compression, or exhaust checks do not relate directly to HV battery imbalance.

Even if the fan runs, blocked ducts restrict airflow, lowering cooling efficiency. ASE L3 emphasizes airflow inspection in HV packs. Injectors, MAP, or throttle parts are unrelated.

The on-board charger interprets pilot signals from external stations to regulate charging. Errors indicate charger module faults or communication issues. ASE L3 training emphasizes charging interface diagnostics. Engine ECUs, oxygen sensors, and radiator fans are unrelated to external charging.