Ok, just ran some tests and I think you’ve nailed it.
I went out to my garage this morning, and connected without starting the engine. The temp gauge on the headliner said 65degF. Sent:
PID: 21D9
Result: 64.16
Response: 00A
0:61D900000000
1:3A203AC0000000
And at that point coolant temp read 64.4 deg F
Then I started the engine and headed out to my first errand of the day, the DMV. I took surface streets, travelling about 3.5 miles in 12the minutes. During that time, the transmission temp reading rose to 117.9 while the coolant temp rose to 186.8 degF and the ambient temp outdoors dropped to 59 deg F. When I parked, I left the engine on and got the following from the test command:
0:61D90E000000
1:58205AA0000000
I’ll keep an eye on it once I get out of here and head to next destination.
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