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Hi.I've done a engine swap on my 2001 330i steptronic.after overheating the engine.this took 7 months because I couldn't get a good engine.my step gearbox was also removed and re-installed during this.I also replaced my alternator.car is running now but my gearbox is in safe mode.
We've connected Autologic diagnostics,it cleared all the old error codes but could not communicate with the egs unit.Get a CAN BUS error.
Then we connected the BMW DIS system.at first it gave a battery alarm,we connected a charger to it.but could not get comms to any control unit.
Battery was then tested and then fully charged.OK.
But the BMW DIS still cant communicate with any control unit.
It look like there is a wiring problem.
But where do I start now.Any advice will be appriciated.
 
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