My speedo only this week, has been playing up.
At start up it will get up to about 20km/h then drop out if it gets going at all. Then when I come to a complete stop it will recover when I move off again. It then may do the same again till I stop or it will stay on working fine for the rest of the drive. Do I have a mechanical cable link or is there an electrical sender?
Any thoughts.
Last edited by Chubba; 10th May 2016 at 07:41 AM.
98' Ti, 4.5L, 2" lift, factory rear diff lock with front E-locker, 63% reduction gears
"GO YOU CROWS"
i had a similar issue ... turned out to be my dash cluster... ended up with a multimeter to test the signal at the dash. managed to get a petrol cluster then swapped the speedo section into my diesel cluster. works a treat.
i suggest you try that if you dont have a signal then most likely the sender ( pull it out test with mulitmeter spinning with your fingers should be quick enough to get a signal)
if its worth doin its worth over doin
Chubba (10th May 2016)
Pull the sender off the gear box, (Is on the top Drivers side on a Q so should be there for a U.) Turn the ignition on and get someone to watch the speedo as you rotate the drive shaft. Alternatively, use the shaft or get a 3/32 or 2mm square drive and use your battery drill to run the speedo drive. My hitachi 12 volt drill runs the speedo at around 60kph.
Last edited by mudnut; 10th May 2016 at 10:39 AM.
My advice is: not to follow my advice.
Chubba (10th May 2016)
While using your fingers to twist/flick the drive you should see about 2-3 volts momentarily on AC volts on your meter.
To make it a lot easier to attach the alligator clips, I used a knife to strip a little section of both wires to connect the multimeter and will use a bit of silicon to seal them properly.
With the drill, I get around 5.5-6 volts.
Last edited by mudnut; 10th May 2016 at 10:38 AM.
My advice is: not to follow my advice.
Chubba (10th May 2016)
On a GQ cluster, the connecting screws for the speedo are easy to get to. You can use the battery drill or have the rear wheels raised and the front wheels chocked, transfer case in 2wd, etc to run the speedo and check the voltages there. Not sure on a GU though as I have not seen one yet.
My advice is: not to follow my advice.
Do you have a scan tool? I think the ECUTalk works with the 4.5. Does the speed reading also drop out?
What about factory cruise control? does that drop out when speedo drops out?
mudnut (10th May 2016)
No scan tool.Originally Posted by Yendor
What do you mean "speed reading"?
Factory cruise control does not work when speedo has dropped out.
98' Ti, 4.5L, 2" lift, factory rear diff lock with front E-locker, 63% reduction gears
"GO YOU CROWS"
Speed reading shown on the scan tool....
Ok. Have been trying to think this one through and thinking hurts me but.
The vehicle speed sensor sends a signal to the speedo and odometer, is it also used to help operate the auto trans gear changes. If the vss was not working properly should I see abnormal auto trans operations? At the moment the trans is still running perfectly. So would that suggest a problem with the dash cluster instead of the vss? Just trying to work out where to start looking before I pull something apart a stuff it when that wasn't the problem.
98' Ti, 4.5L, 2" lift, factory rear diff lock with front E-locker, 63% reduction gears
"GO YOU CROWS"
[QUOTE=mudnut;676094]While using your fingers to twist/flick the drive you should see about 2-3 volts momentarily on AC volts on your meter.
To make it a lot easier to attach the alligator clips, I used a knife to strip a little section of both wires to connect the multimeter and will use a bit of silicon to seal them properly.
Hey mudnut that is not good practice cutting insulation of your wires it can and will cause green death get yourself some multimeter probe spoons cheap as chips saves a lot of hassles down the track image.jpeg
These just slip in the back of the plug
:-) zzzzzzzzzzzzz
98 GU ST wagon 6.5TD chev 5 speed manual dual batteries storage drawers big red air compressor 9L tank millweld front and rear bars millweld 4" snorkel 4" air box 3" tough dog suspension lift drop box and hybrid radius arms 12000Lb winch ARB front air locker Alpine MP3 player amp and a good set of speakers GME 2 way The list goes on
mudnut (7th June 2016)
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