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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 09-17-2014, 01:23 AM
dennishol dennishol is offline
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Unhappy auto kickdown

1999 318ti auto hatch kick down not engaging. What has gone wrong?
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  #2  
Old 09-17-2014, 07:19 AM
hnaz hnaz is offline
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Not familiar with what you mean by hatch kick down not engaging... Do you have a picture? Do you mean the hatch door is not locking the hatch lid in?
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Old 09-17-2014, 07:24 AM
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ZeGerman ZeGerman is offline
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I think he means that when he's driving at a steady speed and then stomps on the gas, the transmission doesn't downshift as it should. That's often referred to as "kickdown".

I'm not terribly familiar with the auto transmissions, but I think shifting is controlled electronically via the transmission control unit (TCU). Do you have any warning lights illuminated?
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Old 09-17-2014, 08:26 AM
hnaz hnaz is offline
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I think he may have to do a scan from the Pacman port itself to see what all codes are being churned up.
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Harry // 1995 Avus Blue M3 - 1994 Alpine Weiss 325is M-Tech (converted to a true M3 prototype) - 2010 Black Sapphire Metallic 128i M - Sport // BMW CCA #453346 - North Capitol Chapter
My 325is M-Tech Restoration Thread
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  #5  
Old 09-17-2014, 09:53 AM
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dc_wright dc_wright is online now
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The downshift (kick down) is controlled either by the TCU when it gets a signal from the DME. I believe the DME is monitoring the TPS and when there's a large rapid excursion along with some other key monitored parameters the TCU downshift the tranny. There's also a kick down switch under the accelerator pedal that should manually kick down the tranny when the floor the accelerator pedal and depress the kickdown switch.

OP, does it kick down with the manual kick down switch and not automatically? Or does it not kick down with either?
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  #6  
Old 09-17-2014, 01:34 PM
M-technik-3 M-technik-3 is online now
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Does the switch on the floor move or is it stuck? if they are not exercised they can bind up.
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  #7  
Old Today, 12:43 AM
dennishol dennishol is offline
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Thank you for replies. dc wright and Ze German seem to have identified the problem. There are no warning lights showing. Are there any tests i can run and has anyone heard of this before?
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  #8  
Old Today, 06:12 AM
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dc_wright dc_wright is online now
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The kick down switch is behind the base of the accelerator pedal (see diagram item 15). I would pull it and test it with an ohmeter to determine if it is closing correctly. If it is, then next I would check the wiring from the kick down switch to the TCU.
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