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Erratic speedo reading on Aprilia Futura .

Intermittant readings. Is it electrical ? Shows 70 mph then 10mph. No odometer reading as well.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Speedometer Not Reliable

This happen to me too. Had to get it replaced under my exstended warrenty that cost me the $200 deductable but would of coast over $400 if this happened later.

Posted on Aug 06, 2008

  • 1 Answer

SOURCE: 1991 Dodge Daytona Speedometer and Odometer not working.

I had the same problem with my 90 daytona. The tach and the speedometer would work intermitantly. I took the whole gauge cluster out, and heated all the soldering with a solder gun to reflow the connections. It seems that this is a common problem with the connections cracking. You may not be able to see the cracks in the solder.

Posted on Oct 31, 2008

j_del
  • 1586 Answers

SOURCE: Gas gauge reading is erratic.

Your sending unit is getting flaky - it's a known issue. You can repair it though, rather than buy a new sender.

Do not do this job with any more than a 1/4 tank of gas or you'll get a fuel bath in the trunk.

Here's a DIY procedure on how to do it - 99% of the time on these cars, when there's a gas gauge issue, it's the broken wire they show in the procedure. I was out of solder at the time I fixed mine, so I used barrel clamp connectors to crimp a jumper wire into place on the broken ends of the wire, and that fixed it permanently.

Here's the link:)

http://www.audiforums.com/forum/showthread.php?t=3621

Instead of replacing the sender, fix the visibly broken wire and it'll fix the failure.

Posted on Feb 10, 2009

  • 3 Answers

SOURCE: 2002 Toyota Echo-speedo,fuel gauge, odometer problem

first replace your fuse if the fuse burn again there is a short circuit cause of the hit search wire that is contct to the body of your car

Posted on Mar 06, 2009

  • 316 Answers

SOURCE: odometer inop and speedometer erratic over 50mph

Yes your speedometer, and odometer are controlled by your speed sensor.

Posted on May 20, 2009

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1994 prizm speedometer eratic tried 3 used clusters and replaced sensor New schematic shows ckt runs through ECM is this a possibility


automatic or stick shift car???????
prizm = toyota corolla, (vast parts to be had and books on same)
1994
what are the symptoms, not guessing I need all facts on symptoms.
lets see. 1.6L engine or 1.8L , sorry they are not the SAME>
so what engine is there?

fuses test good?
car drives perfectly, all other electrics run ok , all lighting ok.
bad cluster , well what is bad, tacho, speedo, odometer, gauges, warning lamps. what?
say all things in the cluster that work and not work.
then and only then can any one give good advice.
ill run with only speedo needle bounces,
most 90s cars love to do that, its a fact. (high miles)
if need speedo and dead odometer that is unique.
that is correct more modern cars, all deleted that speedo cable
long long ago and is now a 10cent wire from cluster to ECU.
as did yours.
since the ECU knows speed already why not let it do the job for free. and did.
end history class but, the odd duck cars exist.

first thing to do is learn that the cars ECU has flash codes
you jumper 2 pins on a DLC, and the ECU flashes the CEL lamp with codes, if the code for VSS is set BINGO transmission VSS is dead, or erratic. code 42 tells you VSS is bad. does it flash 42?

The ECU uses speed, to calculate load and fuel better , knowing this facts.

but in your case its 1/2 true, the odd duck, the toyota way in 1994
is to have the VSS sensor drive the cluster
and the cluster speed drives the ECU.
(have book in hand from mitchells online, so can you of you look)

V3 is bad, (or as in all electrics, (laws) wires./loose/bad, there.
VSS means veh. speed sensor
my guess is you will ask where is it, like all here do not wanting
to pop 15bucks to read at mitchels.
At 55 mph:= 48 Hz ( the signal speed on it) square wave.

where it is depends on auto or stickshift
but its FWD and this sensor in on the side with axle ring gear
i guess.
the 3 wire sensor with R-Y, R-G and R-L color wires is a BINGO.

vss-5okvwe4z4w3ktgpaujwqctz2-1-0.jpg

Mar 28, 2017 | 1994 Geo Prizm

2 Answers

2003. 2wheel dr 150 p.u. I. Put smaller tire on because back problems getting in .now at 60 mph dash odometer reads 69 mph . Is there something I can do . So odometer would be correct.


there are different speedo gears in the transmission available that will allow for some ratio changes in the diff so check with a dealer spares to see if any are available for your vehicle
when you say smaller tire , is it a smaller diameter rim that was fitted
if that is the case by fitting a larger tire case may get back closer to the correct reading
by that I mean for example a 195 25 r14 case can be replaced by a 195 95 r14 case as the difference is in the 25 to 95 measurement
the 25 measurement makes for the rim almost touching the ground where the 95 dimension stands the rim well up off the road and because of that the distance covered in 1 revolution is far different to the distance covered in 1 revolution by the 25 size tire
that solution may put the car back too high for your back problem so if the gears replacement is not possible , then a last solution may be to find an instrument repair shop and have the gauge re- calibrated to the correct reading according to the speedo gears in the transmission
if it is auto with a VSS unit that signals the speedo there may be changes in that area that are possible

Jul 31, 2016 | 2003 Ford F-150

1 Answer

I got a 1998 SVT cobra my speedometer seems to be reading 10 mph faster than what I'm going what would cause that ? at highway speeds it says 80mph when going 70 just bought the car


check rim sizes and tires fitted as they may be smaller than the speedo sender is gear ed for
smaller dia. tires = faster speedo reading as the speedo reads off drive shaft speed

Jan 24, 2016 | Cars & Trucks

1 Answer

I need to know if my 2005 Suzuki Forenza has a BCM or BCU? And if so where is it located? Because I know that some 2005 model vehicles have it and my odometer has stopped working. I had a 2002 Saturn SC2...


you are guessing. there is no need to.
Please
state country and car, ok 05 Forenza.but what country.?
do not confuse Saturn with any Suzuki they are not bothers.
not at ALL.
what counts is the country and VIN.

State side, the car has OBD2 ECU/PCM. and here, we connect a
scan tool and see MPH. does yours show good MPH?
this is the first test, preventing vast guessing and $$$ wasted
and no photos of objects , no guesses.
try posting the full symptoms, and let the tech work the issue.

1: is Speedo MPH dead, or acting up.?
2: is only the odometer dead?
and most cars changing out he speedo head, will fail.
with out a factory scan tool (id dont care what the saturn did,)
on newer cars, you must train the PCM/ BCM to accept a new speedo head. (federal rules....)


btw, its all here, read the online FSM ,for how to test and repair the ODOMETER.
http://www.scantool.net/software/alldata-diy-1-month-subscription.html

on some cars 2004 and newer , use the CAN buss.
this is a communications buss all newer cars use, usa.
at some point, the ECU tells the BCM the mileage and
the BCM send this data to the speedo processor.
that is a complex path, and trying to guess, $3000 of electronics
is not a good idea. eg. swapping all 3? 1 by 1?
The book shows how to find out , where this path is broken.
on old cars, the cable is broken (gears) or head is bad.
on new cars, it's vastly more complex, foiling dealer tampers...etc.
btw2 there are cheap tools to find these facts.

Aug 22, 2013 | 2005 Suzuki Forenza

1 Answer

Speedo and rev counter reading even when engine is off!


I have a similar problems on my 2005 9-3. It has developed a number of minor electical issues. including dial and false warning light triggers. I have fixed most of them by simply going round the car disconnecting the electical connectors and spraying "switch cleaner" (Maplin or Radio Shack).
The only problem I have left is the rev counter occasionally starts reading high, removing the fuse (end of dash panel - 4th fuse down) for about 30s with engine off normally resets everything back to normal.
Hope that helps.

Feb 09, 2013 | 2006 Saab 9-3

1 Answer

The speedo in my 95 mustang Gt Is 10 miles an hour fast


A vehicle speed sensor that is starting to fail could cause this, or less than likely bad wiring or connections, or yes, a bad cluster could do this... But how exactly did she notice the speedometer was 10MPH fast?? There are no real accurate speedometers in vehicles (Don't get me wrong they shouldn't be off by 10MPH) but there is a 5 or so percent difference high or low in many vehicles even with stock powertrains. I've plugged in with a diagnostic scanner on many vehicles and the dash speedo shows 60MPH, but the electronic speed readout on the scanner reads as low as 55MPH or as high as 65MPH

Sep 08, 2009 | 1995 Ford Mustang

1 Answer

Speedo is off at highway speeds and odometer doesn't add up


CHECK IF YOU HAVE THE correct size tire
open driver door locate tire tag and compare the size with what u have

Nov 11, 2008 | 2000 Ford Focus

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