Deck 41: Scan Tools and Engine Performance Diagnosis

Question 1

Rubber gloves should be worn whenever working on or near the high-voltage circuits or components of a hybrid electric vehicle. Technician A says that the rubber gloves should be rated at 1,000 volts or higher. Technician B says that leather gloves should be worn over the high-voltage rubber gloves. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Answer 1

Rubber gloves are used as protection equipment and are worn when working on or near a high voltage circuit. The rubber gloves must be rated at
or more in order to protect the person during severe electric shocks.
For more protection the leather gloves may be worn over the high voltage rubber gloves, which would help in better insulation. Both the statements given by technicians A and B are true.
Hence, the correct option is
.

Question 2

What are the recommended items that should be used when working with the high-voltage circuits of a hybrid electric vehicle?

Answer 2

The recommended items which must be used when working with high voltage circuits are as follows:
(1) Rubber Gloves :
One must wear rubber gloves in order to protect oneself from severe electric shocks.
The Rubber Gloves worn for protection is shown in Figure 1:
Figure 1
(2) CAT III-certified digital multimeter :
This multimeter is essential when measuring high voltages.
The CAT III-certified digital multimeter worn for protection is shown in Figure 2:
Figure 2
(3) Eye Protection : When high voltages are being tested eye protection is a must.

Question 3

A CAT-III certified DMM should be used whenever measuring high-voltage circuits or components. The CAT III rating relates to _____________.

A) High voltage
B) High energy
C) High electrical resistance
D) Both a and b

Answer 3

The CAT III-certified digital multimeter worn for protection is shown in Figure 1:
Figure 1
This multimeter is essential when measuring high voltages. This multimeter is a protection device in order to protect the person from high energy voltages. In order to measure high electrical resistance CAT III-certified digital multimeter is not used, so option (c) is incorrect.
Hence, the correct option is
.

Question 4

What actions are needed to disable the high-voltage (HV) circuit?

Question 5

All of the following will shut off the high voltage to components and circuits, except _____________.

A) Opening the driver's door
B) Turning the ignition off
C) Disconnecting the 12-volt auxiliary battery
D) Removing the main fuse, relay, or HV plug

Question 6

What are the precautions that service technicians should adhere to when servicing hybrid electric vehicles?

Question 7

If the engine is not running, Technician A says that the high-voltage circuits are de-powered. Technician B says that all high-voltage wiring is orange-colored. Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 8

Which statement is false about high-voltage wiring?

A) Connects the battery pack to the electric controller
B) Connects the controller to the motor/generator
C) Is electrically grounded to the frame (body) of the vehicle
D) Is controlled by a relay that opens if the ignition is off

Question 9

What routine service procedure could result in lower fuel economy, which the owner may discover?

A) Using the wrong viscosity engine oil
B) Replacing tires
C) Replacing the air filter
D) Either a or b

Question 10

Two technicians are discussing jump starting a hybrid electric vehicle. Technician A says that the high-voltage (HV) batteries can be jumped on some HEV models. Technician B says that the 12-volt auxiliary battery can be jumped using a conventional jump box or jumper Which technician is correct?

A) Technician A only
B) Technician B only
C) Both Technicians A and B
D) Neither Technician A nor B

Question 11

What can occur if a hybrid electric vehicle is pushed in the shop?

A) The HV battery pack can be damaged
B) The tires will be locked unless the ignition is on
C) Damage to the electronic controller can occur
D) High voltage will be generated by the motor/generator

Question 12

Nickel-metal hydride (NiMH) batteries can be damaged if exposed to temperatures higher than about ___________.

A) 150°F (66°C)
B) 175°F (79°C)
C) 200°F (93°C)
D) 225°F (107°C)

Question 13

How should nickel-metal hydride (NiMH) batteries be disposed?

A) In regular trash
B) Call an 800 number shown under the hood of the vehicle for information
C) Submerged in water and then disposed of in regular trash
D) Burned at an EPA-certified plant