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L3 Light-Duty Hybrid / EV — practice test

Studying for L3 (Light-Duty Hybrid / EV)? Overhaul Prep has 157 verified L3 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

157L3 questions
100%with explanations
9,711questions in total
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Sample L3 questions

Straight from the bank — answers highlighted, with the explanation underneath.

In a series hybrid electric vehicle, the internal combustion engine:

  1. Is mechanically coupled to the drive wheels through the transmission
  2. Drives only a generator and never directly powers the drive wheels
  3. Provides all propulsion torque during highway cruising
  4. Is used solely to operate the air conditioning compressor
WhyIn a series hybrid the engine turns a generator that supplies electricity to the traction motor and/or battery; only the electric motor drives the wheels, so the engine has no mechanical path to the road.

Two technicians discuss the Toyota power-split (series-parallel) system. Technician A says the planetary gearset lets the engine drive the wheels and turn MG1 (generator) at the same time. Technician B says MG2 provides traction torque and also acts as a generator during regenerative braking.

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe planetary power-split device splits engine power between the wheels and MG1, while MG2 both drives the wheels and recovers energy as a generator during regen; both statements are correct.

All of the following can cause a loss-of-isolation (leakage) DTC EXCEPT:

  1. Coolant leaking into the HV battery pack
  2. A 12-volt auxiliary battery that is low on state of charge
  3. A chafed high-voltage cable contacting the chassis
  4. Non-specified PAG oil used in the HV electric A/C compressor
WhyIsolation faults are caused by a conductive path between an HV conductor and chassis ground. A low aux battery can set many other codes (network, no-READY), but it does not lower HV-to-chassis insulation resistance.

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