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Quiz Session - Attempts With Random Questions

ASE L3 Exam Questions

Page 2 of 10

21.

How many methods are there to keep a Toyota Prius running continuously?

  • Two

  • Three

  • Four

  • Five

Correct answer: Two

There are two methods to get the Toyota Prius to run continuously for diagnostic purposes.

22.

What type of gloves should be worn when working on a high-voltage hybrid system?

  • Class 0

  • Class III

  • Class IV

  • Class VI

Correct answer: Class 0

When working on a high-voltage system, class 0 gloves rated at 1000 volts should be worn.

23.

A Toyota Prius doesn't crank and doesn't start. Technician A says this could be caused by a missing hybrid service plug. Technician B says this could be caused by an overfilled crankcase. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Some of the causes of a Toyota Prius exhibiting a no-crank, no-start condition are a faulty 12-volt battery, a missing hybrid service plug, or an overfilled crankcase. 

24.

Which module increases incoming AC voltage and converts it to DC voltage?

  • On-board charger module

  • Battery control module

  • Engine control module

  • Battery monitoring system

Correct answer: On board charger module

The on-board charger module steps up incoming AC voltage then converts it to DC voltage.

25.

How many types of digital multimeters are there?

  • 3

  • 6

  • 2

  • 4

Correct answer: 3

There are 3 types of digital multimeters: industrial, insulation, and precision.

26.

Technician A says some EVs use R-134A as the refrigerant. Technician B says some EVs use R-1234YF as a refrigerant. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Depending on the model, some vehicles use R-134A, while others use R-1234YF.

27.

Technician A says all hybrid vehicles can use the high voltage battery to jump start the vehicle. Technician B says no hybrid vehicles can use the high voltage battery to jump start the vehicle. Who is correct?

  • Neither A nor B

  • Technician A

  • Technician B

  • Both A and B

Correct answer: Neither A nor B

Ford manufactures some vehicles that can use the HV battery to jump start the vehicle. 

28.

How many inclination sensors does the 2009 Toyota Prius use?

  • Two

  • Three

  • Four

  • One

Correct answer: Two

Two inclination sensors are used to meter the fuel gauge.

29.

Technician A says most PHEV and HEV vehicles' ICE and HV systems share a common cooling system. Technician B says most HEV and PHEV vehicles have multiple separate cooling systems. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Most HEV and PHEV vehicles use multiple, independent cooling systems. Sometimes up to three. The ICE cooling, HV component cooling, and HV battery cooling.  

30.

Technician A says the DC-DC converter charges both the 12-volt and HV battery. Technician B says electrical problems with the charge port can cause DTCs. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

The DC-DC converter charges the 12-volt battery as the HV battery is charging. Problems with the charge port can cause diagnostic trouble codes to set in multiple modules within the vehicle.

31.

Technician A says all hybrids use an electric A/C compressor. Technician B says on some hybrids the inverter supplies voltage to the A/C compressor. Who is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Only technician B is correct. On some hybrids, the inverter supplies power to the A/C compressor. Technician A is wrong because some older hybrids use a belt-driven A/C compressor. 

32.

Long-term high-voltage battery problems may result if the state of charge drops below:

  • 20%

  • 10%

  • 30%

  • 40%

Correct answer: 20%

Long-term high-voltage battery problems may result from the State of Charge (SOC) dropping below 20%. Because of this, the SOC should be as high as possible before storing a hybrid for an extended period of time. 

33.

Technician A says some DC-DC converters are stand-alone units. Technician B says some DC-DC converters must be replaced as part of the transaxle assembly. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. Some DC-DC converters are stand-alone units. Technician B is wrong; some DC-DC converters must be replaced as part of the inverter assembly but not the transaxle. 

34.

Technician A says in many cases, the high-voltage service plug doesn't contain the main fuse. Technician B says, in an accident where a short circuit of the HV wires occurs, the HV fuse opens to protect the battery. Which technician is correct?

  • Technician B

  • Technician A

  • Both A and B

  • Neither A nor B

Correct answer: Technician B

Technician B is correct. When an accident occurs and there's a short circuit of the HV wires, the HV fuse is set to open to protect the battery from damage.

Technician A is incorrect. The main fuse is inside the high-voltage service plug on many hybrids, including the Toyota Prius.

35.

Technician A says before towing a hybrid vehicle, the wheels should be chocked. Technician B says the drive wheels should be off the ground when towing a hybrid vehicle. Who is correct?

  • Both A and B

  • Technician A

  • Technician B

  • Neither A nor B

Correct answer: Both A and B

Both technicians are correct. Before towing a hybrid vehicle, the wheels should be chocked, and the vehicle should be put into "off" mode. Then it should be towed with the drive wheels off the ground to prevent the motor/generator from producing AC voltage.

36.

HV electrical connectors that require the use of tools to be separated are orange-colored. What color are the HV electrical connectors that don't need tools for separation?

  • Orange

  • Red

  • Black

  • Yellow

Correct answer: Orange

There are two types of HV connectors. One requires the use of special tools, the other does not, but both are colored orange. Any high-voltage connector that could put you into contact with live voltage must be orange.

Non-high-voltage connectors will not be orange. The color used will depend upon the manufacturer.

37.

Technician A says the EVAP canister vent solenoid is normally open. Technician B says the canister vent solenoid is normally closed. Who is correct?

  • Technician A

  • Technician B

  • Both A and B

  • Neither A nor B

Correct answer: Technician A

Only technician A is correct. The canister vent solenoid is used on vehicles with an enhanced evaporative emissions control system (EVAP). The solenoid is normally open until the PCM activates it during leak testing to block outside air.

38.

The inverter is designed to do all the following except:

  • Convert low-voltage DC to high-voltage DC to power the electric motors 

  • Supply power to the AC motor

  • Control AC motor speed 

  • Convert AC power to DC power to charge the high-voltage battery

Correct answer: Convert low-voltage DC to high-voltage DC to power the electric motors 

The inverter is used to convert DC power into AC power to power and control the electric motors. All the other options are true. 

39.

A DC-DC converter is used to convert high voltage into which of the following?

  • Low voltage used by the accessories

  • Power for the electric motors

  • Low voltage to charge the battery

  • Power for the alternator

Correct answer: Low voltage used by the accessories

The DC-DC converter is used to convert high voltage from the hybrid battery into lower voltage used by the accessories and lighting systems.

The converter is never responsible for supplying power to the electric motors. The DC-DC converter won't supply low voltage to the alternator or batteries either.

40.

Most medium-sized PHEV batteries have which of the following ratings?

  • 18 kWh at 390V or less

  • 1.5 kWh at 300V or less

  • 100 kWh at 390V or less

  • 12 kWh at 300V or less

Correct answer: 18 kWh at 390V or less

A medium-sized Plug-in Hybrid Electric Vehicle (PHEV) battery typically has a rating of 18 kWh at 390V or less. Usually, they are air-cooled and heated with blower fans or liquid-heated and cooled.

Small-size HEV batteries usually have a rating of 1.5 kWh at 300V or less, while the large-size BEV battery measures 100 kWh at 390V or less.

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