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EV Systems Diagnostics
– 8 Hours
What type of seal is used between the inverter and inverter cover on an electric vehicle?
*
A molded gasket made of paper
A molded gasket made of thin steel
RTV
There is no gasket used
Why must the correct type of refrigerant oil be used on a vehicle with a high voltage air conditioning compressor?
*
Because it doesn’t conduct electricity
To ensure proper lubrication
To ensure it conducts electricity
To prevent belt slippage when engaged
What value could we see if there is no short present on generator windings in certain high voltage applications?
*
1 megaohm
2.2 megaohms
2.2 gigaohms
1 gigaohm
Performing an insulation test with our meter is testing for:
*
Shorted insulation of HV wiring
Shorted generator windings
Both shorted insulation of HV wiring AND shorted generator windings
Neither shorted insulation of HV wiring AND shorted generator windings
Where does the three-wire HV circuit go from the inverter assembly?
*
The battery pack
The Motor Generator
The 12 Volt battery
The inertia switch
During the live-dead-live test, why do we test for high voltage twice?
*
To make sure the vehicle is not broken
To make sure the meter isn’t broken
To make sure the HV battery isn’t dead
To make sure the 12-volt battery isn’t dead
If a technician notices coolant in the bottom of the inverter housing, they should suspect a faulty:
*
Head gasket
Coolant pump
Inverter/converter seal
Heater hose
What are two ways to get air out of the HV cooling system?
*
A scan tool and lab scope
A burping funnel and/or an air lift device
Cycling the power button repeatedly
Turn on cooling fans 1 and 2
How can high voltage electronics be cooled?
*
Air conditioning cooling only
Air cooling only
A combination of air and coolant
A Venturi cooler
What component could be located on the inverter cover?
*
The capacitors
The interlock
The HV A/C compressor’s fuse
A gasket to prevent coolant leaks
A common procedure of using only one hand while performing voltage tests on high voltage circuits ensures what?
*
Voltage will not pass through both arms and potentially damage one’s heart
Prevents one from touching a metal surface with the other hand
Allows one to safely only use one HV glove
Allows one to wave for help if needed
After removing the high voltage battery from the vehicle, what type of surface should it be placed on?
*
Steel work bench
A shop cart with wheels
A nonconductive surface
The top of a toolbox
Due to the HV battery pack weight, what procedure is recommended when removing it from the vehicle?
*
Use the correct OEM battery fixture
Ask a friend for help
Slide it out of the vehicle across carpet
Never remove an HV battery from a vehicle
Where do the two high-voltage wires go once leaving the battery pack?
*
To the converter
To the inverter
To the motor generator
To the 12 Volt battery
Please provide us with your email address in order to receive your test results and certificate of completion.
*
Name
*
First
Last
Please take a moment to fill out the course evaluation below:
Instructor
*
Select an Instructor
Tom Rayk
Matt Buca
Larry Cardell
Mark Howell
Toj Wallace
Keith Hardee
Abel Castillo
Jerry Baarson
Dave Buttars
Andrew Fisher
Sara Fraser
John Gillespie
Bill Haas
Tim Iezzi
Kevin Leiby
David Patrick
Kevin Roberts
Adam Robertson
Joe Shirky
Eric Smith
Tom Smith
Glenn Young
Course Evaluation
1. The instructor was knowledgeable.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
2. The instructor was prepared.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
3. The instructor was able to communicate complex topics
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
4. The instructor presented clearly and effectively.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
5. The instructor encouraged participation.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
6. The instructor answered questions thoroughly.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
7. The instructor interacted with course participants.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
8. The course materials were practical and useful.
5 - Strongly Agree
4 - Agree
3 - Unsure
2 - Disagree
1 - Strongly Disagree
What improvements would you suggest for this course?
Are there any other class topics you would like to see provided?
Please provide us with your email address.
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