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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 Mon, Jul-06-2009, 07:04:45 PM   #11
Tonester
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Quote:
Originally Posted by jyrbba View Post
Got a very similar problem as the post above. The car works for a while, but after ~2-3hrs of intense driving SMG(gear) and engine lights lid up. I've checked the error memory for both engine and smg and they always come up with the same errors (BMW INPA).

177 - Mil external info
Mil requirement by SMG
Error present
Static Error

------------------------

56 - Switching on time of hydralic unit
Implausible value
sporadic error

That doesn't really mean s**t to me. I already swapped the relay, and almost thought it fixed when, worked well for almost 3 hours of hard city circuit But then BOOM lights up and dropping out of gears to N/0.

Sounds just too weird to be the pump, since it works great until it actually starts working bad I've checked the smg fluid, and it was like ~70% to the max line, and the car had been sitting for few days. Is this normal? Cause imo the problem seems to happen when the car heats up properly.

Here is the exact error codes if anyone is interested:

------------------------

56 Switching-on time of hydraulic unit

Error Frequency : 1

Error Occured 1. times at:

Current kilometres 90950.00 km
environmental temperature 14.00 grad C
Voltage supply Ubatt 13.00 V
Hydraulic pump state 1.00 0/1
actual hydraulic temperature 76.00 grad C
hydraulic pressure of raw data 79,63 bar
clutch state 1.0 closed
gearbox state 0.00 shifted
engine speed by CAN 2108.00 1/min
sensor voltage supply B 5.01 V

------------------------

And engine...

------------------------

177 Mil external info

Error frequency: 1
logistic counter: 40

Engine speed 960.00 rpm
relative filling 12.00 %
cooling water temp 85.00 degrees C
Lambda adaptation offset 1.82 ms
aufgetreten vor (rel. BZ) 0.10 h

MIL-requirement by SMG
Error Present
Static Error

Ideas anyone?
We just had a car come in and it had the same faults, the pump was not holding pressure.

I took off the pressure accumulator replaced the o-ring and reinstalled everything and pressurized the system to see if it would, but no luck... unit still would not hold pressure. Disassembled the hydraulic unit to see if I can find some sort of failed check valve, but nothing to be seen.

I still haven't had time to upload all those pics and make a post.

Last edited by Tonester; Wed, Jul-08-2009 at 11:13:34 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 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)