PO2402 code and service engine soon light on

Tiny
STRATOMAM
  • MEMBER
  • 2008 BMW 335
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 108,000 MILES
Indicates evaporative emission system leak detection pump control circuit high. Do you recommend replacing pump and if so, where is pump located?
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Monday, July 12th, 2021 AT 8:37 PM

7 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Based on the code, there is a high current going to the leak detection pump. In these cases, it is usually the leak detection pump itself that is bad and requires replacement.

Here is what I suggest. First, access the leak detection pump. Disconnect the one electrical connector to it and inspect the plug for damage or corrosion. Remember, this is a high current, so make sure to confirm there is nothing shorting.

If the wiring is good, the pump is likely stuck in the open or closed position causing the code.

As far as location, the leak pump is located on the left side of the vehicle next to the rear left muffler. If you look at pic 1, I circled the area that will need to be removed. The pump is above the plastic shield and that is the location it will be lowered through.

Next, the easiest way to access the connectors is by removing the lower portion of the inner fender. Remove the two or three lowest screws holding it in place, and gently bend it back to access the pump. Once you have access, remove the plastic (3) vacuum hoses and the one electrical connector.

If you look at pic 2 below, I highlighted the LDP. That view is through the inner fender.

The component is screwed into plastic, so be careful when removing it. Once it is out, you will need a 10mm Torx to remove the pump from the canister.

The installation is the reverse of removal. However, make sure the hoses are properly secured when reinstalling the unit. Also, it is a good idea to use dielectric grease at the connector to improve the connection and prevent corrosion.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.
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Tuesday, July 13th, 2021 AT 7:16 PM
Tiny
STRATOMAM
  • MEMBER
Where can I find ax replacement pump?
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Tuesday, July 13th, 2021 AT 7:20 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
The pump is a common part. You should be able to get one at any parts store or even on Amazon.

Let me know if I can help.

Take care.
Joe
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Tuesday, July 13th, 2021 AT 7:25 PM
Tiny
STRATOMAM
  • MEMBER
Where would I find a wiring schematic? Also what kind of grease did you recommend? I never heard of it.
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Tuesday, July 13th, 2021 AT 8:00 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I'm not sure what you mean by grease. Please explain.

As far as the wiring schematics, I attached them below. These are for the powertrain management. I highlighted wires related to the leak detection pump.

Here is a link you may find helpful when checking wiring:

https://www.2carpros.com/articles/how-to-check-wiring

Note: I had to cut each pic in half to make them readable. However, I did overlap them so you can follow from one to the next.

I hope this helps. Let me know if you have other questions.

Take care,

Joe

See pics below.
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Tuesday, July 13th, 2021 AT 8:49 PM
Tiny
STRATOMAM
  • MEMBER
Hi Joe, thanks for all that! Will I have to manually rewire the pump or will there be a wire harness connector? The grease you referred to was dielectric? Thanks for your help. Is this something you think I can do alone or should I get help? I ve been told I m not very mechanically inclined but I change my own oil and basics.
Thanks
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Wednesday, July 14th, 2021 AT 4:25 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Absolutely you will be able to do it. Just take your time. As far as needing to rewire, that shouldn't be needed unless you find something melted, damaged, and non-repairable. If we get to that point, I will help.

And yes to the dielectric grease. I forgot I mentioned that to you. You can get it at any parts store. I always suggest it when working on electrical connections that are not commonly worked on or repaired.

Also, if you have the chance, could you leave feedback on the following links? It's appreciated.

https://www.google.com/search?q=2carpros&gs_ivs=1#lrd=0x80dcd47364be5d0d:0xba091aa4209f4497,1,,,&tts=0

and

https://www.sitejabber.com/reviews/2carpros.com

Take care and let me know if you have questions.

Joe
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Wednesday, July 14th, 2021 AT 7:12 PM

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