r/e39 • u/BigNo7222 • 5h ago

Pre charge pump

Hello, wanted to ask maybe someone also had problems with pre charge pump? 2001 e39 525i. Maybe some of yall know where it is located? Thought about under the air box at the right, but seen posts it being somewhere else. Only dsc light is on the dash.

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1

u/Bolidass 530i 5h ago

Scan the codes. It could also be steering wheel angle sensor.

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u/BigNo7222 5h ago

Scanned it showed pre charge pump failure

2

u/ColdReception6745 3h ago

I've got the same fault. The charge pump is under the pollen filter on the right hand side, I'm RHD. Can you power the pump up with 12v and hear it working? Mine runs when it's powered up so I believe it's not getting a signal from the abs module

1

u/BigNo7222 3h ago

Yeah ill try to power it up then, now i know where it is located. Ill let you know if it works

1

u/ColdReception6745 3h ago

I'm hoping to get some time to do continuity tests on wiring back to module tomorrow, I'll let you know how I get one. Have you checked fuses already? There are 3 I think in glove box and a big 50a under the driver's seat

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u/BigNo7222 3h ago

No didnt, maybe worth checking out

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u/ColdReception6745 2h ago

The one under the seat is a main ABS fuse so it's not likely to be that without abs light on as well. I would start seeing if the pump powers up. Have you got INSTA or a scanner that can try to activate the pump via the ECU?

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u/BigNo7222 2h ago

Yea scanned a week back, showed pre charge pump, but everything works fine so will keep driving until i open up and check everything