Hybrid systems
Rubber gloves should be worn whenever working on or near the high-voltage circuits or components of a hybrid electric vehicle. Technician says that the rubber gloves should be rated at 1000 volts or higher. Technician says that leather gloves should be worn over the high-voltage rubber gloves. Which technician is correct?
Both technicians
What is the recommended location to store a HEV ignition key during service?
Lock box
On a HEV that uses a "START" push button, what precaution should be taken when de-powering the vehicle?
Make sure the key fob is at least 15 feet away from the vehicle
Which type hybrid uses 36 to 42 volts?
Mild hybrid
Which of these is NOT a step in de-powering the high voltage system?
Remove the ground interlock fuse
If the engine is not running, technician A says that the high-voltage circuits are depowered. Technician B says that all high voltage wiring is orange in color. Which technician is correct?
Technician B only
Technician A says that most hybrids require that they be plugged into an electrical outlet at night to provide the electrical power to help propel the vehicle. Technician B says that the internal combustion engine in an HEV will often stop running when the vehicle is stopped. Which technician is correct?
Technician B only
The abbreviation HEV stands for ________.
hybrid electric vehicle
All of the following will shut off the high voltage to components and circuits EXCEPT ________.
opening the drivers door
What is TRUE regarding protective gloves worn during HV system service?
Both Leather gloves are worn over the rubber gloves to protect the rubber from damage and Rubber gloves should be checked for leaks before each use
Which of these statements about series hybrid electric vehicles is (are) true?
Both The internal combustion engine turns a generator to charge the battery and The engine never powers the vehicle directly
The high voltage cables ________.
Both are energized during events where the ignition switch is in the "on" position and are orange in color
A CAT III certified DMM should be used whenever measuring high-voltage circuits or components. The CAT III rating relates to ________.
Both high voltage and high energy
Technician A says that a completely assembled electric motor is not likely to produce injury by electrical shock. Technician B says that turning off the ignition on an HEV causes the system main relay to disable the high voltage system. Which technician is correct?
Both technicians
Technician A says that when a hybrid electric vehicle must remain in the shop for over a month, the battery should be charged by running the vehicle if possible. Technician B says that if the battery unit must be removed, it should be handled with PPE and always tested for voltage and treated with care. Which technician is correct?
Both technicians
How should NiMH batteries be disposed of?
Call an 800 number shown under the hood of the vehicle for information
What can occur if a hybrid electric vehicle is pushed in the shop?
High voltage will be generated by the motor/generator
The hybrid vehicle control system can detect a high voltage leakage to ground by use of ________.
a ground fault monitor system
The local interlock system on a hybrid vehicle detects when ________ have been removed from high-voltage circuits.
covers
A hybrid vehicle 12 volt battery is located under the hood. This will usually be a ________ type battery.
flooded
Servicing the base brakes on a hybrid vehicle requires the technician to ________.
replace the pads when needed, just as on any other vehicle
Which statement is FALSE about high voltage wiring?
Is electrically grounded to the frame (body) of the vehicle
How long can power be retained in the high voltage system once it has been disabled?
10 to 20 minutes
Nickel metal hydride (NiMH) batteries can be damaged if exposed to temperatures higher than about ________.
150 deg F
Some hybrid air conditioning systems use an electrically driven compressor that uses a special lubricant. What precaution should be taken when servicing these systems?
A dedicated recycling machine for the HEV
Electric motors are better than an internal combustion engine to propel a vehicle because ________.
All of these are correct: They produce high torque at low speeds They are quiet They do not burn fuel and therefore do not release carbon dioxide into the environment
What routine service procedure could result in lower fuel economy, which the owner may discover?
Either Using the wrong viscosity engine oil or Replacing tires
Which of the following systems will require disabling the high voltage (HV) system during service?
Electric AC compressor replacement
How often should linesman's gloves be inspected by a qualified testing lab?
Every six months
Which type of hybrid is capable of propelling the vehicle by just using the electric motor?
Strong (full) hybrid
Which type of hybrid electric vehicle has idle stop operation?
Strong, mild, and medium hybrids
Technician A says that all components in the high voltage battery box are completely insulated from the rest of the vehicle for safety. Technician B says that the high voltage battery box is located under the hood in some vehicles. Which technician is correct?
Technician A only
Technician A says that the high voltage cables may be repaired if damaged while lifting on a vehicle hoist. Technician B says that a paint oven does not get hot enough to damage high voltage cables or other hybrid components. Which technician is correct?
Neither technician
Technician A says that CAT I meter leads may be used to test HV system components as long as the DMM itself is rated CAT III. Technician B says that CAT IV test leads are clamp-on inductive type leads. Which technician is correct?
Technician B only
Technician A says that DMMs are assigned CAT ratings based on voltage capacity alone. Technician B says that DMMs are rated according to their ability to handle potential electrical energy. Which technician is correct?
Technician B only
Technician A says that in a parallel hybrid design, only the electric motor is connected to the transmission. Technician B says that in a parallel hybrid design, the vehicle can be propelled by the electric traction motor, the internal combustion engine, or both. Which technician is correct?
Technician B only
Technician A says that the that HV battery is grounded to the vehicle chassis. Technician B says that the HV battery and cables are completely insulated and isolated from the rest of the vehicle. Which technician is correct?
Technician B only
Which statement regarding high voltage circuitry in HEVs is NOT correct?
The HV system is not energized when the ICE is in idle stop mode and the electrical A/C compressor is running