1994 316I e36 Auto box problem

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  1. 1994 316I e36 Auto box problem 
    #1
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    Hi all,
    This is my first post, so bare with me.
    I have (well my wife does) a 316i auto compact 94 and we seem to have an intermittent problem with Auto box warning light. It comes on for no particular reason (im sure there is a reason, but i cant find it )and then normally goes out. While the light is on, the box is in limp home mode, and only 3rd gear is available. Disconneting the battery normally puts the light out for quite a few days, sometimes even weeks.
    We have sent it to the good old BMW dealer with no success. No fault codes, nothing. I have changed the fluid and filter and this has had no affect either.
    I think the next thing to try would be to replace the sensor, iassume there is one?? What do you guys think?
    thanks all
    Mike1492
    Last edited by mike1492; 14-03-2009 at 22:23.
     
     

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    If the light illuminates then there must be a code there, were the codes for the engine and gearbox read?
     
     

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    Sounds like it could be throttle position sensor.
    I had a similar thing happen on my old 318is and it was just the sensor on its way out.
     
     

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    thanks for your response, thats exactly what i thought, but when it went into BMW, we explained the issue, and luckily for us the gearbox warning light was on, but oddly, no fault codes were thrown up.
     
     

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    thanks coupe-boy, i assume i can just put a multi meter on it or something??/
     
     

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    Quote Originally Posted by mike1492 View Post
    thanks coupe-boy, i assume i can just put a multi meter on it or something??/
    You can, there should be a smooth change in resistance on a multimeter set to measure Ohms when operating the throttle smoothly.
     
     

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    Just a quick update,
    this weekend "the light" as it has become known wasnt on, so i decided to pull the plug on the throttle position sensor and guess what the light came on. Plugged it back in the light remained on. After a few goes the light eventually went out. So i gave the contacts a quick spray with WD40, and so far seems OK. I am going to put a new sensor on, clean the plug contacts and see how we go.
    I did notice that someone has had a "go" at this sensor sometime in the past as the screws were chewed up.
    thanks for ur help, and i will keep you posted.
     
     

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    Hi Guys,
    Thought i would let you all know. I replace the Throltle position sensor tonight, and sadly the light remains. Any one got anything else i can try?
    thanks in advance
     
     

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    Seemed like it may be related to the TPS when connecting and disconnecting made the light go off/on. Maybe the wiring connector needs closer inspection.

    You could also check the integrity/cleanliness of the electrical connector at the transmission itself as there are sensors located within the transmission unit
     
     

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    Quote Originally Posted by mike1492 View Post
    thanks for your response, thats exactly what i thought, but when it went into BMW, we explained the issue, and luckily for us the gearbox warning light was on, but oddly, no fault codes were thrown up.
    Quote Originally Posted by mike1492 View Post
    Hi Guys,
    Thought i would let you all know. I replace the Throltle position sensor tonight, and sadly the light remains. Any one got anything else i can try?
    thanks in advance
    What codes were read? engine AND gearbox codes?
     
     

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