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Chevy volt BECM IMD (insulation monitoring device) and battery insulation informations
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Afaik, nothing HV is tied to chassis directly. I dont remember grounding straps, but I do recall pulling the main cover and checking against the metal backplate and getting no continuity anywhere on metal things sticking out. Wasnt any info online except for eggbert tearing his apart.
Disconnected, I found it to be an expensive useless brick.
Disconnected, I found it to be an expensive useless brick.
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Are there 3 CAN busses talking to the BECM on the gray connector? Or just 2 populated on the board
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Any new findings? Have had Opel Ampera with low measured isolation value (250k) while charging. Replaced battery coolant heater, new onboard charger, checked all HV cables and HV battery. Nothing helped. By doing various experiments I noticed that isolation value did not drop if charging with disconnected mains ground.
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Did you use the factory-approved coolant?
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Sure
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Does that mean "yes", or is it sarcasm?
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YES. When not charging BECM reports 3000k which is max value. And if charging with mains ground disconnected it stays the same 3000k. But as soon the mains ground is connected it drops to ~250k.
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Sounds like you may need a new charger.
It's the only component, other than the charge port and cables, that knows about chassis ground.
Maybe disconnect the charge port cables at the charger and test the isolation to verify a charger fault?
It's the only component, other than the charge port and cables, that knows about chassis ground.
Maybe disconnect the charge port cables at the charger and test the isolation to verify a charger fault?
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Charger has already been installed brand new
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"may" is an important word.
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