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Engine temp not displaying on Dash.

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Clarkey:
Hey all, not been on here in some time.

I have recently put my Omega back on the road after being parked up a number of years. It is a 2001 3.2 Auto. I just fitted a new thermostat but still have no engine temp reading on dash. I plugged in tech 2 to check live data and did an actuator test while I was at it. Engine at operating temp reading 90deg C in engine ECU live feed. When I check engine temp from instrument feed it reads 60deg C at operating temp. I know there are 2 sensors on coolant bridge at back of engine. I took wire off single contact sensor as I thought this was for instrument temp feed and put it direct to earth which turned on engine overheat light but did not move temp gauge. I also tried a replacement dash and got same result. Does single wire sensor simply operate overheat light or does it supply engine temp signal to dash as well?

Thanks in advance,

James.

Doctor Gollum:
That is the dash temp sensor. The fact it grounds the light on suggests the wiring is sound... Doing this should also move the gauge. Did you try with the ignition on? If it still doesn't move, then a new sensor is probably on the cards with the following caveat...

Could also be that the gauge itself is stuck... A gentle tap of a couple of potholes may be enough encouragement.

Clarkey:

--- Quote from: Doctor Gollum on 28 August 2024, 16:16:59 ---That is the dash temp sensor. The fact it grounds the light on suggests the wiring is sound... Doing this should also move the gauge. Did you try with the ignition on? If it still doesn't move, then a new sensor is probably on the cards with the following caveat...
--- End quote ---

Ignition was on when I grounded wire. Was surprised gauge did not move yet overheat light on when I grounded wire. When I performed actuator test with Tech 2, needle went to max and light came on. As engine temp showed 60deg on instrument data feed it was not registering hot enough to move needle.


--- Quote from: Doctor Gollum on 28 August 2024, 16:16:59 ---Could also be that the gauge itself is stuck... A gentle tap of a couple of potholes may be enough encouragement.

--- End quote ---

I've tried a couple of "gentle" taps when driving at the beginning. Looks like replacement sensor is the way forward. Before I fit it can anyone tell me the correct code index for the instrument panel for my machine?

Thanks for reply Doctor G

Doctor Gollum:
If you have access to the live data, is the ECU seeing the coolant temp :-\

TheBoy:
ECU and dash sensors are separate on the 6 cylinder ones (not sure about 4, as never owned one).

Ground the single wire for longer - the dash gauge is massively damped (30+ seconds) - to see if it moves needle.  If it does, replace the sensor (or check it for a large build up of crud, which if it has, this will likely also be present throughout the coolant system, so you know what you need to do!)

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