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Fuel and Temperature guage
Topic Started: Mar 7 2014, 01:48 PM (694 Views)
ex-racer195
Fresh Fish
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Hello all, I am new to this forum and I'm having a difficult problem with my 1998 Metro 1.0. I started noticing the fuel guage, all of a sudden, start fluctuating and then pegged full and stayed there. Now my temperature guage decided to join in the fun and do the same thing. Here's the crazy part, I got a error code and plugged in my code reader to retrieve the code, and when I plugged it in the guages went to normal. Pulled it out, they pegged. The code was a P0500 VSS malfunction, anyone have any ideas? it would be much appreciated
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Memphis metro


One of my previous metros had this gauge symptom. I could wiggle the wiring harness on the passenger side firewall and it would correct itself. Then it might work for days or it might work for a few minutes. Gave the car away, never did pinpoint the problem. Here is my old thread about it.

http://geometroforum.com/topic/3012732/1/#new
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Woodie
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Bad ground to the instrument cluster.
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sphenicie


:gp absolutely, sounds dead on!
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Memphis metro


Woodie
Mar 8 2014, 07:35 AM
Bad ground to the instrument cluster.
I think it is too good of a ground. I would say it is getting a ground it should not.
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ex-racer195
Fresh Fish
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Hello All, it's been awhile since I posted my question and I've made some changes to the car to remedy the problem, but I'm still having the same results. I have a shop manual on order so I'm using a Haynes manual which basically is worthless. I have cleaned and reconnected the grounds on the intake manifold, replaced the instrument cluster, replaced the wiring harness on the interior of the car, and unwrapped the engine harness to check for opens or grounds. I saw in another post that there is a ground wire that is for the temperature and fuel guage, does anyone know what color that wire is? Also, is there another ground location that I am missing? It seems weird to me that everything works fine when I have my code reader plugged in the obdII port. Any suggestions on other parts to check? Thanks in advance, Cheers
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dayle1960
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Fastest Hampster EVER

There is a ground in the rear hatch area below the latch. Might want to check that out.

So you swapped clusters and still have the same problem, right?

If so then I'd say it is a wiring problem. Have you been hacking the wiring? Replaced the radio or cig lighter? With your metro being a 2000 year model I am wonder what type of conditions your running the metro through. Since you live in Cali, I can only surmise the car has a decent frame with no rust. (unless it is a rust belt transplant). So there appears that the grounds should be OK. I'm leaning to a wire in the loom chaffed and rubbing against another one.

While you are driving is your feet touching the loom? Is the loom dangling and having some sort of wear/abuse being bestowed upon it?

Hope these ramblings help to give you some ideas.
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myredvert
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myredvert

Looking at the '97 FSM wiring diagram in the library (I know, you have a 98) but interestingly....

The ECT gauge, fuel gauge, tach (if installed), and the VSS seem to share a blk/blu ground with the OBD II Data Link Connector.

(link) Electrical Diagnosis 08A 14 Ground Distribution G105 (page 08A 14-5)

So my wild a__ non-electrically inclined don't trust my guess says it may be somewhere near the OBD II ground where it joins the cluster group ground or on the back of the OBD connector itself.

I would ask if anyone has a 98 FSM to be able to confirm if anything has changed in that part of the wiring. Good luck! :thumb
Edited by myredvert, Jun 13 2014, 08:42 PM.
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