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| engine coolant temp sensor https://www.ausmini.com/forums/viewtopic.php?f=2&t=71717 |
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| Author: | wolfmini [ Thu Jul 07, 2011 12:05 pm ] |
| Post subject: | engine coolant temp sensor |
hi, my temp gauge doesn't work. i replaced the sensor but still doesn't work. im trying to get my head around how it works. i know the sensors resistance changes with temp and moves the gauge, but i thought u would need two wires one 12v and the other going to the gauge. how does it work with just one wire? should this wire have 12v? any help would be appreciated cheers ryan |
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| Author: | awdmoke [ Thu Jul 07, 2011 12:17 pm ] |
| Post subject: | |
Regulated +ve voltage -> gauge -> sensor -> ground Only needs one wire as it is the ground side of the gauge (grounds by screwing into the engine). |
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| Author: | bnicho [ Thu Jul 07, 2011 12:19 pm ] |
| Post subject: | |
With ignition on, power goes from 12v to the voltage stabiliser at the back of the speedo, then from the other side of the stabiliser to the Temp guage. (Also to the Fuel Gauge). The other wire from the temp gauge goes to the sender, which earths through the engine block to give a reading. If you use lots of teflon tape on the sender it will prevent it working. Dioes the fuel guage work and is it relatively accurate? If so, the voltage stabiliser (small squarish tin can behind the speedo) is working. I'd check the wiring between the voltage stabiliser and the guage, then the wiring from the gauge to the sender. It's highly unlikely to be the gauge itself. |
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| Author: | wolfmini [ Thu Jul 07, 2011 12:20 pm ] |
| Post subject: | |
so the sensor prong acts as a good or bad ground? so the wire should have 12v then? |
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| Author: | wolfmini [ Thu Jul 07, 2011 12:23 pm ] |
| Post subject: | |
this is on a 1988 rover mini, so the back of the instrument cluster has that plastic film with circuits on it |
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| Author: | GT mowog [ Thu Jul 07, 2011 12:39 pm ] |
| Post subject: | |
Quick test. Turn the ignition ON. Disconnect the wire from the sender (sendsor) and short it to Earth. The Gauge should read HOT. Don't leave it this way longer than is needed. If that is OK, the the sender (even if new) is crook or bad earth though it. If it does not, the the Gauge or wiring has a fault. If I recall, the Rover Mini's with the sieko instruments do not use a voltage stabilser. |
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| Author: | wolfmini [ Thu Jul 07, 2011 12:54 pm ] |
| Post subject: | |
thanks for all your help guys. it was a bad ground that was the problem! |
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