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Old Sat, Feb-22-2014, 05:04:38 PM   #1
terraphantm
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Default Converting an MSS54HP into an MSS54HP CSL (H-bridge)

I've gotten a few PMs about this, and decide I'll post a quick summary of what's needed to convert a normal MSS54HP into the CSL variant. I'm assuming you all know how to solder and have decent equipment. In other words, this isn't a beginner's DIY; if you do not have experience with surface mount soldering, I suggest you hire someone to do the modifications for you.

The main item to add is an H-bridge. Here's a picture of my DME with the piece highlighted



For comparison, this is what a non-modified MSS54HP looks like. The IC in question is a Motorola/Freescale MC33186DH. Freescale no longer produces the MC33186DH, but they do produce the electrically identical MC33186VW. This has been confirmed to work to power the CSL flap

Soldering this is a bit of a pain because the IC is heatsunk to the whole PCB; it's difficult to avoid overheating the board. Best would be to use a reflow oven to install the IC. When you're done, it should look something like this



On the other side, you have a couple capacitors to install. Note the highlighted box in the picture below



The larger capacitor is a 15 microfarad 35v capacitor in what I believe to be a "Type D" case. The 2 smaller once are 0805 100nf capacitors.

If you manage to install everything correctly without damaging the board, all you've got to do is flash the CSL software (with either an EEPROM burner or BDM) and you should have an operational CSL flap.

Here are the components:
Freescale MC33186VW1
AVX TPSD156K035R0100
AVX 581-08055C104J4T2A X 2

Do not get the H-bridge from eBay. I tried one, and it did not work properly. Always get them from a reputable vendor like Mouser or Digikey.

There many other capacitor choices that are compatible than the ones I picked up there. Both of those are automotive grade so they should be fine.
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Old Sat, Feb-22-2014, 06:39:44 PM   #2
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Thank you Terra!

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Old Sat, Feb-22-2014, 09:11:25 PM   #3
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Awesome info. Thanks.
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Old Sun, Feb-23-2014, 06:58:10 AM   #4
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Excellent... Thanks for the sharing....
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Old Sun, Feb-23-2014, 10:34:01 PM   #5
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

I'm interested in doing this...Can we have more info about how to generate the bin file to flash? I have my BDM set up and working on my MSS54HP.
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Old Mon, Feb-24-2014, 08:55:23 AM   #6
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Here's how to convert the boot sector

Master:
Change the byte at 0x12AE from "E0" to "F0"
Change the bytes at 0x3FD7, 0x3FDF, and 0x3FE7 from "33" to "35"
Change the word at 0x3FFE from "E2C3" to "3C45" (this is the checksum)

Slave:
Change the byte at 0x12AE (0x812AE if the files aren't separated) from "E1" to "E0"
Change the word at 0x3FE2 from "EABA" to "6465" (this is the checksum)

General structure for each half:
0x0-0x3FFF = Bootsector
0x4800-0x4876 = flash counter; make sure you have at least one set of "00 00" otherwise the DME won't boot
0x8000-0xFFFF = Data
0x10000 - 0x4FFFF = Program


Convert 0PA and 0DAs to binaries to get the program and data sections.



You can clear all the ranges not mentioned. There's some manufacturing data stored, but it's not terribly important.

Last edited by terraphantm; Mon, Feb-24-2014 at 09:03:23 AM.
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Old Mon, Feb-24-2014, 03:04:04 PM   #7
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Great work as usual terra
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- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification
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Old Tue, Feb-25-2014, 12:37:43 AM   #8
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

What about the MSS54 folks?
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Old Tue, Feb-25-2014, 01:46:57 AM   #9
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

You can install 4mbit EEPROMs and do the above modifications (or just use an mss52 which already has the extra h bridge), but it won't work perfectly. There's an internal driver error that will be always present. I think it has to do with the O2 heater circuit
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Old Tue, Feb-25-2014, 03:24:19 AM   #10
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Default Re: Converting an MSS54HP into an MSS54HP CSL (H-bridge)

Another question. Do you have to have the H Bridge if you're not going to have a CSL intake with the flapper?
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Discussing Converting an MSS54HP into an MSS54HP CSL (H-bridge) in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)