E34 520i Transmission problem
Discussion
I've tried searching but I can't quite find a similar problem to mine...
I've bought a '93 520i auto (M50 engine). I didn't realise when I bought it that the transmission programme error light is illuminated as the display is a little pixelated, but it is! Driving normally, the transmission seems to change up/down as normal but I've found that it will not kick down on the pedal and it changes up at around 3500rpm regardless of pedal position. It isn't stuck in one gear so doesn't appear (to me) to be in limp mode. It feels as though it is stuck in economy mode but the mode selector doesn't appear to be doing anything.
I have found in the service history a receipt for a replacement transmission in 2015 (part number 24001219955 from a 1994 520i). I was wondering if this gearbox would also have needed the ECU from the donor car and maybe it didn't get it, causing problems?
The battery and one of the battery leads was also replaced a couple of weeks ago, which I've read can also affect the transmission programme?
Does anyone have any suggestions on the best way to start diagnosing the problem? Is there a way to read the fault codes without a specialist scan tool as it's too old to be OBDII?
Any help welcome!
I've bought a '93 520i auto (M50 engine). I didn't realise when I bought it that the transmission programme error light is illuminated as the display is a little pixelated, but it is! Driving normally, the transmission seems to change up/down as normal but I've found that it will not kick down on the pedal and it changes up at around 3500rpm regardless of pedal position. It isn't stuck in one gear so doesn't appear (to me) to be in limp mode. It feels as though it is stuck in economy mode but the mode selector doesn't appear to be doing anything.
I have found in the service history a receipt for a replacement transmission in 2015 (part number 24001219955 from a 1994 520i). I was wondering if this gearbox would also have needed the ECU from the donor car and maybe it didn't get it, causing problems?
The battery and one of the battery leads was also replaced a couple of weeks ago, which I've read can also affect the transmission programme?
Does anyone have any suggestions on the best way to start diagnosing the problem? Is there a way to read the fault codes without a specialist scan tool as it's too old to be OBDII?
Any help welcome!
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