2012 Prius - clock loses time

Hmmmm hadn't thought of that

 

Yes, the world is out of sync with our Prii.

 

Hmm.. There was a discussion about this in xkcd, of all places. What I remember, though, is that there are a number of time standards. For lack of a better term, there's Universal Coordinated Time; that's the one with leap seconds that make up for the Earth slowing down. Then, there's GPS time. My understanding is that GPS time is fixed, based upon some date in the 1980s, and does not have leap seconds. Which means by now that GPS "noon" is not too close to what UCT calls noon. Switching back and forth from the Garmin may be causing the local clock to skew around as a guess.

I'm running a stand-alone TomTom. I note that at one point in the setup of this thing it had me set the local time. Now, at the time I thought that was mildly funny, since all those satellites had to have really accurate time clocks, so why not get the time of day from them? But if they really have been free-running up there since the 80's, it's a good bet that they're off by a few minutes by now.

Finally: Part of my work life is playing with the plesiochronous clocks in the telecom network. Let's see, we've had complaints about 7 seconds per day. That works out to be 7/(24*60*60) =81 parts per million offset. Your basic, pretty blamed cheap (a couple bucks) quartz oscillator is typically +-50 ppm in accuracy over temperature, voltage, and aging, so it looks like the clock manufacturers are using something pretty cheap in the Prius.

KBeck

 

Seems to me it's some kind of voltage drop, from having the OBDII being plugged in. I don't have an electrical print to figure it out. Need to see if the clock is seeing a voltage drop with the OBDII plugged in

 

The Torque app itself can do this task. Settings-dash installation-airplane mode when no power.

 

Odd. Usually one takes in 12V and reduces same to 5V, 3.3V, or whatever the VCC du jour is on the electronics in question. And those "reductions" are done with linear or switcher regulators which have very good output regulation. And standalone oscillator devices are further supposed to be invariant in frequency with voltage variation.

If there's that much variation - well, very, very, very cheap oscillators.

KBeck

 

I'm using my Garmin ecoroute to monitor RPM, engine temp, engine load, etc. the Garmin goes into a S/D mode however I don't know what the OBD dongle does.

 

The root problem is in the use of the obdii port. It appears that unless there is a way to turn off or unplug the connection, which is very inconvenient I'll just need to bump up the clock minutes ever other day.

 

I haven't used the port yet, but the clock still loses about a munute a week.

 

Hmmm that's interesting? My wife has a 12 and I didn't notice any time loss. I'm curious do you have any devices in any outlets?

 

None at all.

 

well hmmmmm, i wonder if there is a way to fix it with software. it just seems odd. not a big deal but it is annoying.

 

Could this be the same software malfunction that causes the speedometer to read fast and the MPG reading to be off as well?

 

There hasn't been much chatter on this topic. Probably due to most folks aren't using a GPS or a scan gauge or some other obd2 device

 

Actually, only 16 seconds separate UTC from GPS time. Closer than most any other randomly-selected pair of clocks in the average person's house, I'm sure.

 

Anyone ask a dealer about this issue?

 

My clock can lose up to 1 or 2 minutes a day. Think this is a warranty issue?

 

Me, I'd think so. Tell them and find out. The worst they can say is "no". And, if you're lucky, they'll tell you the threshold of "how for out before repair".

KBeck.