I tried numerous methods of searching for this, but I'm quite sure I don't know the correct terminology to use. 2002 Prius, ~165k miles. When I first start the car, the first 30 seconds or 1 minute the "Consumption" display will show no outside temp and the mpg gauge stuck at 100mpg. After warming up (I use that term loosely as its still 70s/80s here), it will operate like normal. Shutting the car off and turning it back on will not bring the issue back - the car will need to sit for a few hours or overnight for the problem to come back. Any ideas what is going on here?
Strange intermittent failure of the gateway ECU? During that first 30 seconds or 1 minute, are you fast enough to bring up the MFD's diagnostic screen and see what shows as ok/not ok in the service check mode? -Chap
He can bring it up to IGN and as long as the engine is not started, get a chance to monitor the controllers. Need to verify IGN does not have the effect of 'running the clock' that leads to the condition cleared. Bob Wilson
