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Temp guage problems


 
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ciaran15



Joined: 23 Mar 2010
Posts: 224
Location: Omagh

PostPosted: Sat Jul 23, 2022 16:27    Post subject: Temp guage problems Reply with quote

Having some trouble with my temperature guage.  the guage is not working. I've replaced the sensor and it hasn't solved the problem. Tested the sensor with a multimeter and its going up and down dramatically. Would this have anything to do with the glow plug relay. I think she's overheating so can't be driving around with the guage not working if anyone can help me out
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PostPosted: Sat Jul 23, 2022 16:27    Post subject: Google Ads keep this community free to join!


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Fostlongstrider
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Joined: 03 Mar 2008
Posts: 2471
Location: Hedon, East Yorks

PostPosted: Sun Jul 24, 2022 10:04    Post subject: Reply with quote

The glow plug relay is controlled by a feed from the coolant temperature sensor.
When the coolant reaches a certain temperature it isolates the glow plugs.
My gauge just goes above the low mark when up to normal running temperature.
It only goes higher, half way or so, when going up long hills but drops quickly when back on the flat.
It could be a faulty gauge.
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All the best from the East Riding of Yorkshire.
'93 L300 Super Exceed †Corse Gray over Grace Silver.Auto.

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ciaran15



Joined: 23 Mar 2010
Posts: 224
Location: Omagh

PostPosted: Mon Jul 25, 2022 18:15    Post subject: Reply with quote

I don't think it's the guage. everything else on the guage is working fine. Why would the voltage be shooting up and down when I test the sensor with the multimeter. I've tried three sensors and still nothing. Maybe a wire is damaged somewhere. ??
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Fostlongstrider
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Joined: 03 Mar 2008
Posts: 2471
Location: Hedon, East Yorks

PostPosted: Mon Jul 25, 2022 22:16    Post subject: Reply with quote

As you say there could be a broken wire just making contact now and again.
However if this was the case the gauge would move up and down.
You should be able to short out the sensor to earth and the gauge should then move up and down.

Has your sensor got one or two terminals?

If the meter is making good contact with the sensor the voltage should be stable.
Does the voltage vary with the engine stopped or running?
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Ian.

All the best from the East Riding of Yorkshire.
'93 L300 Super Exceed †Corse Gray over Grace Silver.Auto.

Flying Brick Supporter.
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ciaran15



Joined: 23 Mar 2010
Posts: 224
Location: Omagh

PostPosted: Fri Aug 05, 2022 13:18    Post subject: Reply with quote

okay so I think I've narrowed it down. I ran a wire from the temp sensor to the engine block and turned on ignition but not the engine and the temp guage went up. So the problem is not the guage or wiring. I've checked online and theres a few other people have had the same problems were the relays are clicking like mad and the guage isn't working. It seems to have something to do with the ecu. Is there anyway of checking the ecu. ??  Or can I just replace it ?
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