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HV batteries rely on dedicated cooling fans to regulate pack temperature. If the fan motor fails, heat builds up during extended high-load conditions. ASE L3 emphasizes identifying cooling-related HV battery failures as they directly impact performance and safety. ICE head gaskets, fuel injectors, and alternator belts affect the combustion system, not the HV battery.

Blocked cooling ducts prevent airflow through the HV pack, causing overheating. ASE L3 stresses HV thermal management system checks. ICE coolant, fuel relays, or belts do not directly cool HV packs.

If relays stick closed, HV circuits remain energized, preventing safe shutdown. ASE L3 emphasizes relay safety diagnostics. Fuel, spark, or exhaust issues aren’t involved.

If the sensor reports incorrect temp, stop/start logic keeps the engine on. ASE L3 stresses sensor input reliability. Spark, PCV, or refrigerant faults aren’t responsible.

Brake pedal position sensors inform the control module of driver input for brake blending. If faulty, regen is disabled and warnings set. ASE L3 objectives emphasize electronic brake system diagnostics unique to hybrids. Fuel, belts, or exhaust would not cause this hybrid-specific fault.