scotty2541
Member
It's been a while since I've been in the PEM so I'm just going to throw out ideas for discussion based on my experience (and fuzzy memory)...
1) We definitely had problems with the precharge circuit and traced it back to the IGBT on the CIC I/O board (the one with it's own heatsink) which had shorted. Without that circuit functioning the car would not charge.
2) We also had blown at least one of the capacitors
Sorry I don't have any more info, it's been a while and we replaced a LOT of components.
I would start with the IGBT on the CIC I/O board - it probably took the brunt of the spike and shorted.
Thanks. Easier Questions: Where is that board?
(All fuses I could find, under just that the power connection panel, or with the entire PEM opened, were fine)
I don't know what the CIC I/O board is, nothing is labeled. The only heat sink I see is mounted on the vertical board, off to the left of the big white molex connector hidden (marked on the image below)
Here is a picture looking in the PEM. Under that is another picture of my measurement of a power resistor.
I think it's the one that is supposed to be 39 ohms, but it's 100 ohms. 2 /12 times the resistance would make the precharge circuit too low after the defined interval (about 4 seconds).
Is the board in question where this resistor is plugged in? Mounted vertically above the bottom PEM connectors?
I'd like to be more confident before unscrewing everything, taking it apart.
And advice is appreciated.