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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.

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Old Fri, Jun-09-2017, 06:09:37 PM   #951
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Default Re: SMG troubleshooting FAQ

Sorry to read your troubles I can't help you with your specific issue, but if I were you I would look into the rebuilt-pump option. When I thought my pump was dying I had considered going that route, and when it DOES eventually die I think I will replace the motor with a rebuilt one.

But make sure the pump is the problem first! There is a great deal of troubleshooting that can be done as I learned, just starting with my SMG in April.

My recommendation would be first to buy the USB data cable and download the BMW reader software (several options available). That was you will not only be able to read the codes but can check up on the various sensors, etc. I was able to see exactly when my pump was turning on and how much pressure it was producing. Inexpensive DIY troubleshooting tool!
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Old Fri, Jun-09-2017, 06:36:02 PM   #952
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Default Re: SMG troubleshooting FAQ

Note that the above linked company only rebuilds the pump motor. You can get the motor and pump for a few bucks more here:
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Old Sat, Jun-10-2017, 11:49:28 PM   #953
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Default Re: SMG troubleshooting FAQ

Thanks all for info and support, really appreciate it. Cable ordered, finally got Windows 7 x32 installed on my old mac (surprisingly a major PITA given that the cd drive is broken and Apple doesn't want to make booting from USB on laptops with CD drives easy... hopefully this part was harder than actually installing and using DIS/Progman).

Car's still sitting in the shop. They disassembled the intake box and got to the pump -- turns out there was a scrapyard pump installed that was undisclosed. I'm pretty peeved about that, because I now might have a crap pump with 120k on it that could go any time (even if this problem turns out to be something else). Still diagnosing what's going on. Could be an electrical thing -- relay light came on before the underpressure, overpressure, and no response codes came on. Changing the relay didn't do anything, and while I smelled burning when it died I suppose it could have been an electrical component BESIDES the pump's motor (maybe the pressure sensors, or just a wire somewhere).

It would be strange to go from seemingly fine to dead so fast if it were the pump motor, wouldn't it? I was able to do quick up and down gear changes just fine. Anyone know approximately how many bars of pressure are used per gear change? From what I read on the SMG service manual the normal operating range is 40-80.

Either way I really, really want to get the info on what the heck is going on with this pump.

EDIT: Yeah, pump's dead alright.

Last edited by UncleDad61; Mon, Jun-12-2017 at 01:48:24 PM.
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Discussing SMG troubleshooting FAQ in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)