Instrument cluster swapout help

[Mareo]

Originally Posted by CTScott

The instrument cluster gets the engine temperature from the ECM by CAN bus message, so it is very strange that the light is always on. Does the "cool" light come on when you turn the key on?

Hi CTScott, unfortunately not, the "cool" light was always off while the "hot" one on.
It's odd that when swapped to my original speedo and I turned the key on, the "hot" ligth appeared for 1sec and then was replaced by the (correct) "cool" ligth.

Do you think there was something wrong in the ECM? I don't think so because I suppose the speedometer is just receiving signals not sending to the ECM (am I right?).

Do you think the new speedometer is not calibrated properly and reads the same CAN signal as the original speedo but with a different range cool-hot?

Anyway, tomorrow I'm going to swap again to the new speedo and check if the light is still on. Do you have any alternative in case it's still there?

Thanks.