petrol & temparature gauges are malfunctioning

2001 TOYOTA TAZZ
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MSICO
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They point a full tank and a very high temperature even though the tank is on 1/4 and the car is been standing.
Petrol gauge and temperature gauge malfunctions, petrol shows full tank even though the tank is 1/4 temperature shows very hot. what must i check?
Dec 17, 2010 at 6:02 PM
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KASEKENNY
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More than likely this is a cluster issue. These are pretty common to fail so I would suggest starting with checking voltage for the fuel gauge coming into the cluster.

Basically the voltage is going to change based on fuel level. So we want to check it when it is empty and then put gas in it and see if it steadily changes. If it jumps around or does not change then the cluster is not the issue.

https://www.2carpros.com/articles/how-to-check-wiring

The fact that you have two things not accurate points to a cluster but checking voltage will confirm this.

Please see the wiring diagram below of the USA version of this vehicle. It is not going to be exact but close enough that you should be able to get a good idea what the issue is.

Please run through this info and let us know what questions you have. Thanks
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Sep 13, 2021 at 4:33 PM