I can only repeat that I really am almost certain it is not the CHT but instead has been scaled internally by the PCM to be ECT, unless you're reading the sensor volts using a meter and doing the calculation yourself.

(Yes, it's fitted as a CHT and internally the PCM can understand it as such but from OBD it will have been converted to ECT and probably the temp range changed.)

Adequate does seem reasonable!!

 

Nope, I'm reading straight from my generic scanner. We are all at a disadvantage because we don't know the exact details of how the sensor reading is converted for our viewing pleasure.

The only thing I do know is the needle climbs from center above 230F. I've extrapolated that as being the top of the normal band. I think I'm in a good place with the margin I'm seeing below that.

I tried one other thing for calibration, but it may not mean much. Before a cold start in the morning, with the engine off at least 12 hours, I checked the temp reading. Over several mornings, the displayed temp agreed within 5F of ambient air temperature, so that seemed pretty accurate. Now whether it's still accurate in the 200F range? I hope so.

 

Sounds good enough.

 

Update to an old thread. While searching for something else, I found a chart of resistance values for the CHT sensor in this document (Thanks Gus!), on page 24:

http://www.jagrepair.com/images/Trai...es/870B_SG.pdf