#1: Changing speedo sensor Author: PistolPete, Location: Bristol, UKPosted: Mon Jan 10, 2011 4:49 am ---- Hi All,
I've had my speedo seeming die. Oddly it started playing up and the same time as a slight drop in power on the motorway at 60-ish, and it would feel like heavy wind into the front of the car. When the speedo started working again the power would perk up.
The next day the speedo stopped altogether and the ODO is now no longer working so I suspected the speedo sensor (I'd had problems before with a sticking needle, but the ODO was still working then and a speedo sendor is cheaper than a cluster!!)
I got a replacement and went to fit it and removed what I thought was the speedo sender - top of the gearbox pretty much straight under the MAF sensor housing.
I pulled it out - looked like I was expecting, a threaded end with a small brass nipple coming out of the end which is slightly spring loaded - I assumed a hall effect type sensor picking up notches in the gearbox somehow. I get the replacement out of the box and it's not the same.
I googled for an image of the speedo sensor and found pics of the same thing I'd been sent (this is not my old one and the new one is the same minus the cog on the bottom)
My questions are these:
1) Is what I've been sent correct for a 2000 2.0 HDI 90?
2) If so, where is it located
3) Also, what did I take out??
If need be I'll take a pic of the location of what I took out and post it on the thread later.
Thanks for looking
Pete
#2: Re: Changing speedo sensor Author: Edward, Location: In the garagePosted: Mon Jan 10, 2011 6:10 am ---- Have you removed the crank sensor? The speed sensor is right at the back of the gearbox on the final drive.
#3: Re: Changing speedo sensor Author: PistolPete, Location: Bristol, UKPosted: Mon Jan 10, 2011 6:19 am ---- I've googled the crank sensor and I can't find an image that matches what I had, but I guess it's possible as this was front the front / top of the gearbox and can be seen if you look down just to the right hand side of the MAF housing.
I'll have a look from under the car at the back of the gearbox.
Thanks for the reply - hopefully I'll be looking in the right place now!!
#4: Re: Changing speedo sensor Author: Edward, Location: In the garagePosted: Mon Jan 10, 2011 6:57 am ---- You didn't take out the reverse light switch did you?
#5: Re: Changing speedo sensor Author: MrBSI, Location: What's it to you? ? ?Posted: Mon Jan 10, 2011 9:38 am ----
Edward wrote:
You didn't take out the reverse light switch did you?
It sounds like it to me
#6: Re: Changing speedo sensor Author: PistolPete, Location: Bristol, UKPosted: Tue Jan 11, 2011 11:52 am ---- Hahaha. Googled the reverse light switch and BINGO!!
#7: Re: Changing speedo sensor Author: Edward, Location: In the garagePosted: Tue Jan 11, 2011 1:21 pm ---- Dimebar!
#8: Re: Changing speedo sensor Author: macj, Location: EssexPosted: Tue Jan 11, 2011 1:28 pm ---- Any idea of the wiring on a speedo sensor..... Is there a power feed to it from ECU and would it have a pulsed signal output??
Any idea of the wiring on a speedo sensor..... Is there a power feed to it from ECU and would it have a pulsed signal output??
yes... that is true... it is connected to +12v and it generates pulses... the higher speed the higher is the frequency.
I was tweaking with speed sensor and found that slower speed is around 70ms for the hi-level pulse... and the faster you go, the smaller will be the pulse duration.
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