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No rail pressure indicates the fuel pump is not running. ASE L3 emphasizes hybrid-specific restart concerns, often involving fuel delivery after extended EV use. Inverters, fuses, or PCV systems don’t directly cause zero fuel pressure.

Erratic torque output points to winding insulation issues in MG2. ASE L3 emphasizes diagnosing electrical faults in motors. MAP, PCV, or throttle issues don’t fit.

If MG2 does not receive inverter command, regenerative braking is disabled and the vehicle freewheels. ASE L3 stresses recognizing loss of regen torque and its electronic causes. Timing chains, fuel pressure, or A/C fuses don’t stop regen braking.

During the transition from EV to ICE, precise synchronization of crankshaft and camshaft sensors is required. A failing crankshaft position sensor may cause erratic signals, resulting in stalling when the ICE attempts to start. ASE L3 emphasizes hybrid-specific transition events as critical diagnostic points. Dirty throttle bodies or weak fuel pumps can cause stalls, but the sudden failure during transitions points more directly to synchronization errors. Wheel speed sensors affect ABS/regen braking, not ICE start transitions.

The DC/DC converter charges the 12V battery from HV supply. Failure leads to low charge and ABS/regenerative braking issues. ASE L3 stresses DC/DC diagnostics in supporting systems. ICE components are not related.