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.

[CTScott]

Originally Posted by Mareo

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.

Hopefully the issue is that your coolant temp sensor is actually bad. I have experimented with clusters from other regions and the temperature lights always worked correctly, as the cluster just receives a CAN bus signal from the ECM with the temperature. Definitely not an ECM issue.

[Mareo]

Originally Posted by CTScott

Hopefully the issue is that your coolant temp sensor is actually bad. I have experimented with clusters from other regions and the temperature lights always worked correctly, as the cluster just receives a CAN bus signal from the ECM with the temperature. Definitely not an ECM issue.

Hi CTScott, I don't know the reason but now the light is off.
So it looks like everything is working fine.
Thanks again,
Matteo