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During long EV use, injectors are inactive. If the fuel rail loses pressure due to regulator or pump check valve issues, the ICE restarts rough. ASE L3 stresses ICE restart fuel system checks. Exhaust, blower, or MG2 issues are unrelated to restart fuel delivery.

IGBTs generate heat during switching. If the cooling system fails, they overheat, setting DTCs and producing abnormal noise. ASE L3 emphasizes inverter thermal management. Ignition, exhaust, or fuel issues don’t cause IGBT overheating.

Hybrid clutches manage torque blending between ICE and motors. Synchronization failure causes jerks. ASE L3 stresses transmission clutch diagnostics. O2, belts, or refrigerant are not related.

Stop/start relies on coolant temperature. If falsely reading cold, the ICE stays running. ASE L3 emphasizes coolant sensor roles in hybrid logic. O2, MAP, or knock sensors don’t directly control shutdown.

The onboard charger regulates input from external stations. If defective, it may still accept basic 120V input but fail on Level 2/3 chargers. ASE L3 emphasizes charger module and pilot signal diagnostics. ICE fuel and exhaust components are unrelated.