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Author car cutting out and speedo not working
corsa_boy
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Registered: 14th Apr 02
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19th Sep 05 at 21:58   View User's Profile U2U Member Reply With Quote

ive had a dodgy speedo for a while now but when you bang the top of the dash it starts again, but today its stopped working altogether but also the car has cut out a few times this evening,

any ideas?

the cars an N reg sport

thanks
ed
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Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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19th Sep 05 at 22:14   View User's Profile U2U Member Reply With Quote

Is the ECU light coming on? Will probably be the vehicle speed sensor failure fault I think. Need to get the speedo repaired if it is.
corsa_boy
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Registered: 14th Apr 02
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19th Sep 05 at 22:16   View User's Profile U2U Member Reply With Quote

yeh it comes on then goes off, can that cause the car to cut out though?
ed
Member

Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
User status: Offline
19th Sep 05 at 22:21   View User's Profile U2U Member Reply With Quote

Yea, if you do the paperclip test (look in FAQ) it will come up with fault 24, which isVehicle Speed Sensor - no speed or low voltage. This has been known to make the car cut out but you can then re-start the car after...

Check this page out too:

http://www.topbuzz.co.uk/info/fault_codes/fault_codes.htm
corsa_boy
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Registered: 14th Apr 02
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19th Sep 05 at 22:22   View User's Profile U2U Member Reply With Quote

cheers mate, if this is the case houw much do you think im looking at?
ed
Member

Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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19th Sep 05 at 22:24   View User's Profile U2U Member Reply With Quote

Will probably be the gearbox speed transducer or wiring. If it's the speed transducer they are about 5 from a scrappy or maybe 30-40 new. If it's wiring then it might just be a case of securing the plug into the dash properly with a zip tie - it could be this because you say it starts woking again when you bang the clocks... Oh the clocks could be broken too - these are hundreds from Vauxhall or about 20 from a scrappy...
corsa_boy
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Registered: 14th Apr 02
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19th Sep 05 at 22:28   View User's Profile U2U Member Reply With Quote

i dont have a clue about this sort stuff so, once ive found the fault code booking it into a garage maybe best?

thanks for your help
ed
Member

Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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19th Sep 05 at 22:30   View User's Profile U2U Member Reply With Quote

Yea, maybe even a good idea to get the garage to do a fault reading on it - Vauxhall have special machines to diagnose faults, though it's a bit pricey...
Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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19th Sep 05 at 22:33   View User's Profile U2U Member Reply With Quote

speedo cable... no brainer
corsa_boy
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Registered: 14th Apr 02
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19th Sep 05 at 22:37   View User's Profile U2U Member Reply With Quote

cheers mate, may be back soon, will see how i get on tomoz.....
ed
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Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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19th Sep 05 at 22:44   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Siberia
speedo cable... no brainer
Oh yea, never thought about it being a cable controlled Speedo... D'oh
corsa_boy
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Registered: 14th Apr 02
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20th Sep 05 at 07:07   View User's Profile U2U Member Reply With Quote

so you reckon the speedo cable is broken?

[Edited on 20-09-2005 by corsa_boy]
Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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20th Sep 05 at 07:15   View User's Profile U2U Member Reply With Quote

what year is your car? engine size?
RapidSRi
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Registered: 28th Feb 05
Location: Brisbane, Australia
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20th Sep 05 at 10:40   View User's Profile U2U Member Reply With Quote

i had this same problem with my 1.8 Corsa C. the dials all turned on and off whilst driving on numerous occassions and one day the car just would not start after going into limp home mode. was corrosion in the wiring behind the dash. may be just a plug to replace but difficult to get to
corsa_boy
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Registered: 14th Apr 02
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20th Sep 05 at 16:40   View User's Profile U2U Member Reply With Quote

1996 N reg 1.4 16v sport
corsa_boy
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Registered: 14th Apr 02
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20th Sep 05 at 21:35   View User's Profile U2U Member Reply With Quote

can the speedo cable cause the car to cut out?

cheers
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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20th Sep 05 at 22:10   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by corsa_boy
can the speedo cable cause the car to cut out?

cheers


yes it can. it will be a cable driven one as well if it was manufactured before 1996

easy way to tell is if your speedo starts at 10mph its cable, 0mph and its electronic.

it will cause it to cut out as the cars ecu tells the icv (idle control valve) when to open and close when you dip the clutch when you pull up at a junction etc. the ecu uses a signal that is sent by the vss (vehicle speed senser) to determine vehicle speed vs engine speed to tell the icv how far and how long to open for. the vss generates its signal in the back of the clocks. its driven via the speedo cable. no vss= no signal to the icv= no air on idle= car cuts out

that a good enough explanation for you
corsa_boy
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Registered: 14th Apr 02
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21st Sep 05 at 08:31   View User's Profile U2U Member Reply With Quote

that is, thank you very much, can tell the garage my suspicions tonight now
Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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21st Sep 05 at 08:34   View User's Profile U2U Member Reply With Quote

save yourself the money a speedo cable is around 20 quid and takes about 20 mins to fit.
corsa_boy
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Registered: 14th Apr 02
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21st Sep 05 at 08:48   View User's Profile U2U Member Reply With Quote

aint got a clue how otherwise i would
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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21st Sep 05 at 09:00   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by corsa_boy
aint got a clue how otherwise i would


disconnect speedo from gearbox (easy tod do its at the top at the back of the box to the left as you look at it from above.)

take clocks out

unclip cable from clocks

replace it all.
corsa_boy
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Registered: 14th Apr 02
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13th Oct 05 at 20:43   View User's Profile U2U Member Reply With Quote

right ive had the cable replaced but its still cutting out,

the man at the garage said its the clocks that'll need replacing

is this true?

[Edited on 13-10-2005 by corsa_boy]
jazzer2k3
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Registered: 24th May 03
Location: **SHEFFIELD**
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14th Oct 05 at 00:15   View User's Profile U2U Member Reply With Quote

No, i had the exact same problem .. i dint connectmy speedo cable after my conversion and it kept cuttin out at light or when u dip clutch down ..

i can't honestly see it being ur dials ... It's kinda a bast@rd to get to to fix in place the cable, so maybe loose .. if like mine it has sher'd then loose bits of it are still in the holder for the cable .. the new one won't go all the way down

Or does ur speedo work ?
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
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14th Oct 05 at 01:21   View User's Profile U2U Member Reply With Quote

read this bit again:

quote:
Originally posted by corsa808


yes it can. it will be a cable driven one as well if it was manufactured before 1996

easy way to tell is if your speedo starts at 10mph its cable, 0mph and its electronic.

it will cause it to cut out as the cars ecu tells the icv (idle control valve) when to open and close when you dip the clutch when you pull up at a junction etc. the ecu uses a signal that is sent by the vss (vehicle speed senser) to determine vehicle speed vs engine speed to tell the icv how far and how long to open for. the vss generates its signal in the back of the clocks. its driven via the speedo cable. no vss= no signal to the icv= no air on idle= car cuts out

that a good enough explanation for you


if the speedo is working, then it is connected fine. it could be the vss thats in the back of the clocks thats knockered, but its unlikely as it worked fine before the cable snapped right?

trace the red/blue wire seen in this pic of a clock plug:



trace it from that point on the plug down to the ecu. (with ignition on) and check for continuity. if there is continuity check that the clocks are connecting onto the plug properly when they are pushed into place.

if thats all ok, then its likely that the vss in the clocks is faulty and you may need to try a different set.

its 2.20 am now, and im off to bed

 
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