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hooverphonique
Level 6 User
Joined: 10 Nov 2005
Posts: 149
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Fri Aug 25, 2006 6:35 pm |
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right... on the dash end of the speedo cable there's a white block with a wire out of it.. asa far as i can gather, this is for the road speed sensor.. I'd just like to know why its there and what it does for the car, technically, and also, what happens if it doesnt work/werent there... thanks.. |
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Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
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Fri Aug 25, 2006 7:56 pm |
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If the road speed sensor is not working then the trip computer (assuming you have one) will not return stuff like average speed, average mpg etc
Also it can affect idle, for instance pulling up to a junction and the car will stall. |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Sat Aug 26, 2006 3:24 am |
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it tells the ECU that the car is infact moving.
If its not there then stalling, higher fuel usage and slightly less performance are all side effects of its input not being there. |
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hooverphonique
Level 6 User
Joined: 10 Nov 2005
Posts: 149
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Sat Aug 26, 2006 6:41 am |
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got no trip comp 
so thats the symptoms of non-working RSS sorted.. what i fail to understand is, why the ECU would need to know if the car is moving or not ? (like, what the "scientific" explanation of the need for this signal is, i if you get my drift)
my car does not have any of those symptoms, btw (knock on wood).. |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Sat Aug 26, 2006 6:45 am |
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over run fuel cut off, reason why the engine has a load on it etc |
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Wicked Neo
FCS Event Manager
Joined: 04 Jan 2005
Posts: 3680
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Sat Aug 26, 2006 6:55 am |
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i can affirm higher fuel useage lol
my road speed sensor is not working due to my speedo cable being buggered, i've pulled the speedo off the chammy this morning so just need to fit it to the hatch now |
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R1916S
Site Subscriber
Joined: 23 Jan 2005
Posts: 502
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Wed Aug 30, 2006 5:43 am |
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Funny the Hi Idle issue only seems to affect certain ECU,s.
Maybe its a European car thing as Clios and 19,s F3p,s seem to effected by it.
Maybe its just a certain series of ECU,s that are effected. |
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bbracer16valver
Retroholic
Joined: 23 Dec 2005
Posts: 3315
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Wed Aug 30, 2006 5:51 am |
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my car seems to high idle sometimes fook no's why but never 900rpm always 1000-1100rpm thing is TB has NO screw on top and everything is cleaned de-gunked its not a prob just annoying
so what else new lambada?
like i said not really to high just annoying |
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Peahole
Level 7 User
Joined: 12 Mar 2005
Posts: 243
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| Posted:
Wed Aug 30, 2006 5:59 am |
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| bbracer16valver";p="106307 wrote: |
my car seems to high idle sometimes fook no's why but never 900rpm always 1000-1100rpm thing is TB has NO screw on top and everything is cleaned de-gunked its not a prob just annoying
so what else new lambada?
like i said not really to high just annoying |
Is the screw not there (empty hole) or not even a place on the TB for it? |
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bbracer16valver
Retroholic
Joined: 23 Dec 2005
Posts: 3315
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Wed Aug 30, 2006 6:03 am |
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Chris H
Forum Moderator
Joined: 02 Mar 2004
Posts: 19978
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Wed Aug 30, 2006 8:50 am |
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well it is there then isn't it.
it affects different cars to different degrees, sometimes the cars will act normally then other times idle high. |
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