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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 04-30-2010, 12:10 PM   #21
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Join Date: Dec 2006
Location: New York
Posts: 22
My Ride: 2000 BMW 328CI
Need help guys!!

Got a P1477, P1421 & P1423

Tried the seafoam method and I think my secondary air pump isnt working... no matter cold start, or after warmed up, the seafoam never went through!! Does that mean I need a new secondairy air pump??
328ciNY is offline   Reply With Quote
Old 12-01-2010, 09:08 PM   #22
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Join Date: Aug 2008
Location: Canada
Posts: 16
My Ride: 99 e46 328i 4door
ERROR CODE P1477 - Leakage Diagnostic Pump Reed Switch Did Not Open

1) Locate the leakage diagnosis pump, attached to the carbon canister under a black plastic cover between the fuel tank and the spare tire well, under the car.

2) Check for power to the pump on a red/white wire - battery voltage with car running from fuse 3 in the engine fuse carrier in the electronics box in the engine compartment.

3) Check for power on the control wire, brown/blue going to the Motronic control unit

4) Check the signal wire, black/green. When the control wire is grounded, the signal wire should show battery voltage out of the switch inside the pump.

5) Check the signal wire has continuity to pin 34 of the Montonic control unit and that the control wire has continuity to pin 30.

6) On the small vaccuum hose to the leakage diagnosis pump, check for intake manifold vaccuum with the car running.

Four E46's had this same error code.

*3 E46's had the Leak Detection Pump (LDP) Vaccuum Hose Repaired (in other words the vaccuum hose was loose or broken at the intake manifold)
*1 E46 had the intake manifold vaccuum line replaced

I got this info directly from a BMW mechanic so if you ask any questions i probably wont know the answer....!
balwinderb60 is offline   Reply With Quote
Old 07-25-2011, 01:14 PM   #23
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Join Date: Jul 2003
Location: UK
Posts: 133
My Ride: 328i
Originally Posted by sbuoncri View Post
I have an article for you too if you need it. give me your email address. It talks about all of the secondary air pump stuff and how to diagnose the exact problem.
PM sent!
phelix is offline   Reply With Quote

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