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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-12-2012, 01:04 PM   #1
BeaMerWorld
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Join Date: Feb 2012
Location: Pittsburgh
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My Ride: E46 M3 Cab
Problems with Drive

So here is the case, I have a 2002 325i, I hit black ice and slid into the guardrail completely destroying the driver's side front end. Most of all the damage is cosmetic, no damage to the engine or tranny other than some broken lines and a pulley on the front. So I towed it home and luckily I found a totaled e46 that I got for parts as it would turn out cheaper than to buy single parts separately. So since the oil cooler line was ripped away causing damage to the radiator too I didn't want to move it because alot of ATF and coolant probably ran out. Got that repaired first and the car would turn on and move forward and backwards but obviously couldn't take it out for a test drive.

One day after some cosmetic parts replacement I decided to move it to a new spot and suddenly it will no longer go into drive. I can shift into D without a problem but the car will just rev up and not move, only moves in reverse. The transmission fault code is illuminated on the dash and when I put it into steptronic mode it only shows an S and will not change gears. I did a ton of search and found many reverse problem threads but nothing for Drive problems until this thread.

So I changed the oil and filter thinking maybe the filter was clogged. Disconnected the return line from the oil cooler to run out some of the old fluid in the lines and the pump seems to be pumping oil just fine. Still no drive, only reverse without a problem. Could it be the transmission computer? Any suggestions. I have an extra e46 with complete undamaged engine and tranny I can use, I just want to reach easy tasks first before doing a tranny overhaul. (The spare e46, a 1999 325i, is totaled so I'm better off fixing mine as it only had damage to the front left corner). Any ideas, pointers, suggestions, comments would be great.
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Old 09-12-2012, 01:24 PM   #2
RKiepper
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If the transmission fluid is low, this will cause the problem you are experiencing.

You have to warm up the car, and cycle the transmission through the gears first before checking the fluid level.
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Old 09-12-2012, 01:36 PM   #3
BeaMerWorld
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How do you check it? by the fill plug on the side? So should I let it warm up as you say and then top off?
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Old 09-12-2012, 01:49 PM   #4
RKiepper
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Ah.. Let me think.

1. Warm up engine/transmission
- there's a Minimum temp - I'll find it
~ between 30-50 degrees Celsius.

2. Transmission, not car, must be level

3. Cycle transmission through all the gears, waiting a few seconds between shifts to ensure the cylinders are filled

4. Fill plug on the side of the transmission, basically - fill until fluid comes out.

Capacity for my transmission is 8 liters.. I'd imagine yours is similar.
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Old 09-12-2012, 01:56 PM   #5
BeaMerWorld
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How do you know when its roughly 30-50 degrees Celsius? Should I get some type of thermometer or can I just let it run for a certain amount of time and then cycle through the gears?
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Old 09-12-2012, 02:00 PM   #6
RKiepper
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We're talking 86-122 degrees Fahrenheit.. Hot to the touch, but not enough to burn you. If it's above 90 outside, you should be good to go.

Last edited by RKiepper; 09-12-2012 at 02:02 PM.
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Old 09-30-2012, 09:16 AM   #7
BeaMerWorld
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So I just did the warm up and filled up the transmission making sure it stayed in each gear for like a minute. Still the car won't go forward and I'm pretty sure it's full of ATF. I checked the codes and it reads: P0604, P1345 P1112 along with other ones that I already worked on like misfires or airflow sensor. Any ideas suggestions?
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Old 09-30-2012, 11:10 PM   #8
Beamer Creamer
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I have m3 but havent looked to closely. Is it all electronic or is there a rod on side of trans for shift select. Pretty dumb question with smg i know. Hard to say for sure. Accidents can do lots of diff things. Reverse check what is causing codes. Find what the circuits are and do some old fashioned testing i guess
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