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When I made those cat temperature observations, I noted that my UG and SG cat temperature gauges behaved oddly. Indicated temperatures shot >500 degrees F within 3 blocks of driving, which seems impossible, or at least improbable.
They also indicated cat temperatures dropped on every FAS from 500, 900, even 1100 degrees F to <200 degrees F within the 15 seconds to 1-2 minutes of the engine-off glide. This is another impossibility.
I suspect the UG and SG cat temp algorithms must rely on a voltage signal that resets when the UG and SG detect the engine-off condition. Obviously, the cat cannot physically cool 1000 degrees in a few seconds.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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