TechnicianVision · Knowledge base
Powertrain Overview: Hybrid Electric Vehicles (HEV)
I-CAR · March 25, 2019
Summary
This article provides an overview of Hybrid Electric Vehicle (HEV) powertrains, explaining how they combine gasoline internal combustion engines with electric motors and high-voltage (HV) batteries. It highlights critical safety and service requirements, including disabling the HV battery, isolating the 12V battery during welding, and using specialized fluids and procedures for the separate hybrid cooling and HVAC systems.
What to do on the job
Properly disable the high-voltage battery according to OEM service information before performing any service, and disconnect and isolate the 12V battery prior to welding.
How to use it
Use this document to justify line items for high-voltage system disabling/enabling, 12V battery disconnect/reconnect during welding operations, and specialized fluids and procedures required for servicing hybrid-specific cooling and HVAC systems (such as electric AC compressor oil).
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