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General E46 Forum
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Old 07-13-2011, 10:15 AM   #1
bkriaras1
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Join Date: Jun 2011
Location: chicago
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My Ride: 2002.5 m3
Exclamation PLEASE ADVISE 2002 m3

Hey guys, just changed the battery in the car because it was weak, and as soon as i started the car, the car started but wouldnt shift into gears or reverse. I have a 02 smg m3.. I waited about 5 minutes, and then the car was working fine???? Is this normal, did the car need to like reprogram it self?

im a bit confused, no service engine lights or anything, i just thought it was a bit strange, i know these cars are very glitchy.. But should i worry about anything. smg pump is fine and shifting correctly..

Please let me knwo thanks..
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Old 07-13-2011, 11:36 AM   #2
todd@tmrtuning
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The most common issue is the SMG pump relay in the e-box . It's located above your pedals- under the hood. remove the torx screws, remove the black plastic cover- SMG relay is the salmon colored one.

NEXT common issue- SMG pump / accumulator failing. The SMG pump is the COMPLETE hydraulic unit for the SMG- except for the actuator on the back of the trans. The hydraulic pump contacts fail. This is EXPENSIVE and requires dealership tools.

The last issue with the SMG is the position sensor on the rear of the transmission (behind the actuator that replaced the shifter) Usually the sensor just loses position and the trans needs to be recalibrated so it knows what gear is where and what force it takes to engage each gear.

These are all assuming that the CLUTCH is good- if the clutch is coming apart- the trans input speed sensor will not see clutch release- and cause shifting issues.

Take the car to a dealer that knows what they are doing, have them calibrate the SMG unit with the ISID- or find an indy shop at www.BIMRS.ORG and have them attempt calibration. They SHOULD be able to read faults. Accumulator faults or pressure faults result in a relay replacement- if the problem continues- it will need a pump assembly. Position faults result in a position sensor.
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Old 07-13-2011, 03:43 PM   #3
bkriaras1
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I see and thanks for your help..

as far as the pump relay in the ebox, how much would that cost to buy and put from dealer.

and if worst case scenario its the smg pump hydraulic unit what would that cost me..??

and for the position sensor on the rear of the trans and needs to be recalibrated what am i looking at.

what if nothing continues, and car is working fine? what preventive maintanance should i do with this car a t 87k miles.
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Old 07-13-2011, 04:10 PM   #4
todd@tmrtuning
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Quote:
Originally Posted by bkriaras1 View Post
I see and thanks for your help..

as far as the pump relay in the ebox, how much would that cost to buy and put from dealer.

and if worst case scenario its the smg pump hydraulic unit what would that cost me..??

and for the position sensor on the rear of the trans and needs to be recalibrated what am i looking at.

what if nothing continues, and car is working fine? what preventive maintanance should i do with this car a t 87k miles.

If you can get the Part number for you I can get you a pretty decent Price. As far as dealer charge im not to sure on that one. Hydraulic unit itself is pretty expensive your looking at thousand or more. Just take it to a good bmw shop and have em recalibrate it for you. Also check your belts , check your spark plugs , air filter regular tune up stuff. Your cooling system should be good till 100k 02 sensors probaly 100k your ok just keep up with oil changes and changing tranny fluid every 2-3 years helps aswell as doing a coolant flush every year.
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Old 07-13-2011, 06:04 PM   #5
bkriaras1
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Great thanks. do you have a contact number, can you get the pump at a cheaper price.

thank you.
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