This is only about chassis ground current, not earth leakage, which is strictly the domain of the charging circuitry.
Seriously: if you do not understand the difference please do no not start messing with the HV side of an electric vehicle. Below 48 V is considered a safe voltage but can already - under the right conditions - cause you plenty of hardship and I'm aware of one death from a 48 V system.
Anything higher than that with voltages between 200 and 600V pretty much the nastiest range because it is too low to arc and high enough to kill you needs special precautions, tools and ways of working to keep you safe.
You can't rely on technical measures to keep you safe when diagnosing and repairing those circuits because those technical measures could be the cause of the fault.
Seriously: if you do not understand the difference please do no not start messing with the HV side of an electric vehicle. Below 48 V is considered a safe voltage but can already - under the right conditions - cause you plenty of hardship and I'm aware of one death from a 48 V system.
Anything higher than that with voltages between 200 and 600V pretty much the nastiest range because it is too low to arc and high enough to kill you needs special precautions, tools and ways of working to keep you safe.
You can't rely on technical measures to keep you safe when diagnosing and repairing those circuits because those technical measures could be the cause of the fault.