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Twincam1986

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  1. Twincam1986

    E34 520i won't kick down

    Just to update, this is finally fixed! After a lot of messing about, it transpired that the TCM was faulty. Swapping it for another with a matching part number has sorted it out. I must say a massive thanks to whiskychaser who has been more than helpful and tolerant of my mithering, there's no way I would have gotten it sorted without his knowledge!
  2. Twincam1986

    E34 520i won't kick down

    Thought I should update this in case anyone else has the same symptoms. Whiskychaser very very kindly scanned the Transmission Control Module for me. It's showing Code 40 Engine Intervention. He was also able to inform me that code 40 equates to pin 40 of the transmission control module, which is in turn connected to pin 14 of the engine control module, which supplies throttle position. This pointed to either the throttle position sensor or a wiring fault between pin 40 and pin 14. With some instructions on how to test the TPS, it did appear to be slightly out of spec, so I ordered a new one. Unfortunately, after fitting it today, that hasn't solved the problem. I'm awaiting a new multimeter to investigate things further. Massive thanks again to whiskychaser for all of his help so far!
  3. Twincam1986

    E34 520i won't kick down

    Don't worry, I've stomped on the pedal , you can feel when it clicks but there's no kickdown. I'm probably just not describing the display very well. This is my cluster: This is the display with the ignition on. Photo is not clear but you can just make out that it says E on the left and P on the right as it looks a bit clearer in real life (both of these change ok when the mode is changed or selector moved when ignition is on but car not started). It does look like S on that photo, but it's E, you can tell the difference when you select S. This is the display once the car is started - just the cog, nothing else David Bailey I am not!
  4. Twincam1986

    E34 520i won't kick down

    If I drive it gently it will change up lower than 3200rpm. However if i floor the throttle, that is the highest change point, so it won't hold on to each gear and it won't kickdown. It's odd, as I'd have thought if it were stuck in sport, it would be holding on to each ratio? I'm not sure that there's anything wrong with the box, it seems more like an electrical issue of some kind or something with the peripherals. Again, I don't know but I would have imagined a problem with the box itself would have caused it to lock in 3rd as has been mentioned elsewhere? Whiskeychaser - just typed out a reply on the other forum I'd posted this on, but it's awaiting confirmation from a mod, as there's a pic on it. When it's started, it just displays a cog with an exclamation mark. With only ignition on, it will display the gear selector postion and the mode and it always goes back to E each time. I can start the car in any of the 3 modes and it goes straight to the cog symbol once started. I've tried starting it with the mode selector switch unplugged and it;s the same result, cog symbol once started. I don't mind a drive to Oldham if you're able to read the codes for some beer money
  5. Twincam1986

    E34 520i won't kick down

    Thanks for the reply. I've just had a play with it after reading around on various forums. The display is pixellated but it's definitately displaying trans prog error once the car is started. With just the ignition on, you can make out the gear selector position and the mode selection. When it starts, this changes to a cog and is backlit orange. Most posts I'm reading suggest it locks into 3rd or 4th when this error is displayed but I'm definitely getting 1-4. It feels normal under regular driving conditions, but it will change up at about 3200rpm in each gear when floored and won't kick down. It doesn't seem to go into 5th (or lockup, whichever it is) but revs beyond 3200rpm fine in 4th. I've had the selector switch apart and cleaned the contacts but it made no difference. I also cleaned the mode selector switch. I did notice whilst doing that, that the selector itself doesn't lock into position, i.e you can select any gear position with the engine running or not, without pushing the button on the gear selector. I checked the battery as I read that a voltage drop when starting can upset the system. The battery is 3 weeks old but is 56AH when the handbook recommends 65AH. I tried starting it with a jump pack attached in case it wasn't getting enough power with the 56AH but it made no difference and the car starts on the button with the smaller battery. I need to read the codes really but trawling around to find somewhere with the kit to read a 1993 BMW gearbox ECU doesn't fill me with anticipation. I'm near Warrington if anyone knows of somewhere?
  6. Twincam1986

    E34 520i won't kick down

    I've tried searching but I can't quite find a similar problem to mine... I've bought the above car today (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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