[335i E92]

Keep getting the below 'Freeze frame' info when I scan for codes with the BT cable. Any ideas? HPFP? No other codes with it apart from a 2AAF
'fuel pump plausibility' that always comes back too, pretty sure the 2AAF is normal when tuned & should be ignore though.

Looks to be suggesting that pump is failing to deliver at certain times?

Freeze Frame Information
Event 1
Odometer 123224kms 76567miles
fuel pressure before mass control valve 5,688.80 hPa
Engine speed 3,072.00 rpm
voltage Kl. 87 13.61 V
injected mass of fuel 0.00 l/h

[JamesM3M5]

What is the code? Only 2AAF? There should be more info here.

[335i E92]

2AAF isn't anything to worry about apparently, just need to delete it. It's the freeze frame info that I'm trying to figure out!!

[rader1]

That's what james asked you for, what code is the freeze frame describing?

[blisstik]

Freeze frame is just conveying a point in time when the fault occurred with details. Like a photo. Get it?

[335i E92]

Sorry, my bad!!

No other codes other than the 2AAF, I undersand that the freeze frame is a snap shot of what occurred. Im FBO 400bhp+ flash, thinking it might be the hpfp failing to deliver?

Or it could be nothing, would i see other codes if the hpfp was taking a walk?

[rader1]

Originally Posted by 335i E92

Sorry, my bad!!

No other codes other than the 2AAF, I undersand that the freeze frame is a snap shot of what occurred. Im FBO 400bhp+ flash, thinking it might be the hpfp failing to deliver?

Or it could be nothing, would i see other codes if the hpfp was taking a walk?

Then the snapshot was of the 2AAF code being triggered. If the 2AAF code is "normal" then the snapshot is "normal" aswell.

[bryce]

2AAF is pretty normal, but cobb tuning has recently said they think that's an indicator that the low pressure (LPFP) fuel pump couldn't keep up. i've had that code for a few years though, no issues to speak of

[335i E92]

Ok, cheers guys!!

My local Indy did indicate that the 2AAF code could be related to the lpfp a few months back when I was trying to diagnose my idle shakes n shivers. Might be worth considering replacing!

[JamesM3M5]

2AAF is low pressure fuel pump not able to spin at the required speed. If you look at the running speed versus the requested speed, the running speed is much lower. This is not a problem provided the LP system runs at 5.0bar. Per BMW documentation, this code is to be ignored unless there are other fuel related codes stored as well.

[335i E92]

Originally Posted by JamesM3M5

2AAF is low pressure fuel pump not able to spin at the required speed. If you look at the running speed versus the requested speed, the running speed is much lower. This is not a problem provided the LP system runs at 5.0bar. Per BMW documentation, this code is to be ignored unless there are other fuel related codes stored as well.

Thanks for the input, so are you saying that I need to replace it or ignore the code?

I was hoping it might explain some performance issue's I'm having along with a rough idle. It did have 2 other codes that only came up after a full system scan with the BT cable, they were:

A3AD:
CAN ID 1D0 error: Engine data
Error will not cause a warning light
Error is not currently present
Test conditions have been completed

A3AE:
CAN ID 0AA error: Idle engine speed
Error will not cause a warning light
Error is not currently present
Test conditions have been completed

[Turkeybaster115]

Originally Posted by JamesM3M5

2AAF is low pressure fuel pump not able to spin at the required speed. If you look at the running speed versus the requested speed, the running speed is much lower. This is not a problem provided the LP system runs at 5.0bar. Per BMW documentation, this code is to be ignored unless there are other fuel related codes stored as well.

This troll advise should be taken with a grain of salt. Code 2AAF should be taken seriously, as we have seen several members on here with failed LPFP's often with catastrophic results.

[JamesM3M5]

Originally Posted by Turkeybaster115

This troll advise should be taken with a grain of salt. Code 2AAF should be taken seriously, as we have seen several members on here with failed LPFP's often with catastrophic results.

Really?

http://www.e90post.com/forums/showpo...68&postcount=9

Now shut the fuck up.

[Turkeybaster115]

Originally Posted by JamesM3M5

Really?

http://www.e90post.com/forums/showpo...68&postcount=9

Now shut the fuck up.

Crap written by the same Jokers (BMWNA) who now have a lawsuit against them for stating pretty much the same thing for the waste gate issue in the turbos, and the HPFP. Yeah, you were lucky enough to have your LPFP give you warning signs, so don't replace it for the customer. So you probably believe that a vehicle's transmission fluid, should never be changed, and that oil should be changed every 15-30,000 miles. Wait, shocks, differential fluids, and coolant, are all LIFETIME, which basically never need changing.

For those who care about this issue, and have a high mileage 335I like myself, if you ever get this code, and choose to ignore it, then at least you were forewarned (According to the documented research the LPFP is running at nearly double the normal pressure from day 1. As the pump ages, it's ability to meet the vehicle fuel demands greatly deminishes):

http://www.e90post.com/forums/showth...highlight=LPFP

http://www.e90post.com/forums/showth...highlight=LPFP

What an LPFP failure event looks like (only 30K miles):

http://www.e90post.com/forums/showth...highlight=LPFP

[JamesM3M5]

Originally Posted by Turkeybaster115

Crap written by the same Jokers (BMWNA) who now have a lawsuit against them for stating pretty much the same thing for the waste gate issue in the turbos, and the HPFP. Yeah, you were lucky enough to have your LPFP give you warning signs, so don't replace it for the customer. So you probably believe that a vehicle's transmission fluid, should never be changed, and that oil should be changed every 15-30,000 miles. Wait, shocks, differential fluids, and coolant, are all LIFETIME, which basically never need changing.

For those who care about this issue, and have a high mileage 335I like myself, if you ever get this code, and choose to ignore it, then at least you were forewarned (According to the documented research the LPFP is running at nearly double the normal pressure from day 1. As the pump ages, it's ability to meet the vehicle fuel demands greatly deminishes):

http://www.e90post.com/forums/showth...highlight=LPFP

http://www.e90post.com/forums/showth...highlight=LPFP

What an LPFP failure event looks like (only 30K miles):

http://www.e90post.com/forums/showth...highlight=LPFP

First, you were immediately called out for being a troll in this thread as soon as you mentioned that his tune was probably to blame.

Second, reading comprehension is not your strong point. This was caused by a faulty low pressure fuel pressure regulator being clogged/failed. Not the pump. The pump may have failed, but from what we can gather, it was because the regulator was clogged or failed. And he never posted what codes the dealer found. Probably because they misdiagnosed it from the beginning.

If the system doesn't have any other codes for fuel system problems or any driveability complaints, this 2AAF code merely reports that the fuel pump speed differs from what is specified. I've seen it for myself.

As for the first two links you posted, thank you. I had not seen them until you brought them up. Good info, but nothing that definitively proves that a LPFP can cause catastrophic problems. If the LPFP can't keep up, there should be codes for low pressure (failure to maintain 5.0bar). Using pumps in series also means that the lift pump does not necessarily have to support the full power requirement.

[335i E92]

Thanks for the input guys!!

Understand the arguments on both sides but none the less still confused as to what action to take. I have a rough idle & suspect im loosing power at certaitn situations like long pulls in 3rd gear. Over the last 18 months I've replaced the below so they can be discounted from the situ:

Low pressure fuel sensor
All plugs
All injectors
All coils
Both vanos solenoids

One thing I have noticed is since going from a stage 1 tune to FBO a few weeks ago this 2aaf code is presenting itself much more regally, like i clear it and it's back a few days later with the same freeze frame 'failure to deliver fuel' message.

My car is 2006 with 70k, Shivs exposure of the lpfp's diminishing performance is quite alarming but I'm not getting any other fuel related codes alongside the 2AAF code!!

Given the above, should i change it anyway?

[Turkeybaster115]

Originally Posted by JamesM3M5

Really?
Now shut the fuck up.

Moderators, do we allow this type of language in these forums?

[JamesM3M5]

If you can use the BT to log a high load run with RPM, throttle position, and low pressure fuel pressure output, you will know whether the LPFP is able to keep up or not. If not, then replace it and/or the pressure regulator after inspecting all the parts. If it stays at 5.0+ bar pressure the whole time, then it is unlikely that it is the cause of your problem.

[335i E92]

Originally Posted by JamesM3M5

If you can use the BT to log a high load run with RPM, throttle position, and low pressure fuel pressure output, you will know whether the LPFP is able to keep up or not. If not, then replace it and/or the pressure regulator after inspecting all the parts. If it stays at 5.0+ bar pressure the whole time, then it is unlikely that it is the cause of your problem.

Appreiated, borrowing a JB4 this w'end to do some more indepth logs!!