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On my drive to work this morning I was coming up to a stop like. I killed the engine in neutral and was rolling up to the liht when I noticed it was about to change. I turned the rngine back on before the Scangauge had a chance to completely power down(it's not set-up in hybrid mode). Anyway, when I had turned my ICE back on, the MPG read 9999, and GPH read 0.00. I thought maybe it was a momentary reading but after a couple seconds it didn't pick up the signal.

Eventually I pulled up to another light where I killed the ICE, and the unit hada chnace to re-set, and it still would read the MPG and GPH at 9999/0.00 respectively. I finally hit my third light and I "hard-booted" the unit by diconnecting the data cable and reconnecting it. After that the unit worked as normal.

Has anyone else had this issue before? Show I change my engine type from Gas to hybrid? I generally don't FAS in gear, just in neutral, and I only killed the ICE when I'm at a light I know will take at least 20 secs to change. Suggestions or comments?

There's no reason NOT to use Hybrid mode. The readings are all the same, it just keeps it alive during FAS.

As to the actual problem, I have no idea. Sorry.

There's no reason NOT to use Hybrid mode. The readings are all the same, it just keeps it alive during FAS.

As to the actual problem, I have no idea. Sorry. Are you sure this is the ONLY difference??

Also, I have the new Scangauge II, and although I have it set to gas, it retains current trip data for up to 3 minutes after shutting engine off, so in my case I don't think setting to "Hybrid" would buy me anything. Maybe older versions require the "Hybrid" setting to retain info for short shutdowns???

Hi John:

___It is not about the shut down, hybrid mode allows the SG-II to record distances and fuel use (none during a FAS or when a hybrid like the Prius shuts down) if that helps. You can watch your aFCD during a FS when setup as gasoline and it just sits there. Swap to Hybrid mode and it will continually calculate distances with no fuel use thus giving you a more accurate reading of FE.

___I am actually hoping Ron will remove the gas option as hybrid mode operates the exact same as gas only with the recording function of distance accumulation with the ICE-Off. A non-hybrid, non FAS driver would not know the difference between Hybrid and Gas mode but a hybrid or advanced hypermiler will see the difference immediately in Gas only mode … I hope that helped?

___Good Luck

___Wayne

I know I had a problem with the sg reading 9999 while accelerating in my car sometimes, so I'd often end up with really high readings. Anyways I went to the fuel cutoff option and changed it from the default value of 24 to 1. I don't have that problem anymore.

Hi John:

___It is not about the shut down, hybrid mode allows the SG-II to record distances and fuel use (none during a FAS or when a hybrid like the Prius shuts down) if that helps. You can watch your aFCD during a FS when setup as gasoline and it just sits there. Swap to Hybrid mode and it will continually calculate distances with no fuel use thus giving you a more accurate reading of FE.

___I am actually hoping Ron will remove the gas option as hybrid mode operates the exact same as gas only with the recording function of distance accumulation with the ICE-Off. A non-hybrid, non FAS driver would not know the difference between Hybrid and Gas mode but a hybrid or advanced hypermiler will see the difference immediately in Gas only mode … I hope that helped?

___Good Luck

___Wayne Thanx!! Great explanation!! :)

I know I had a problem with the sg reading 9999 while accelerating in my car sometimes, so I'd often end up with really high readings. Anyways I went to the fuel cutoff option and changed it from the default value of 24 to 1. I don't have that problem anymore.


Could it be that his car was in open-loop mode after being fas'd and combined with the cutoff setting of the sg being at the default 24 his sg decided he was in fuelcut?

I know my car uses only 5 seconds to go into closed loop, but his car might have much longer warmup time?

Hello, I drive my '98 s10 manual truck like a dork, shutting engine off & coasting. Looks like this is the right place to 'fess up about these atypical driving methods.

I have assumed that with the ignition off, the scanguage is not accumulating distance, because the powertrain control module is off and not sending serial data out with vehicle speed. The odo sure doesn't count up.

(ignition off to save energy from automatic headlights near dusk & dawn, and keep from killing the battery during trips, with engine off maybe half or more of the time. In warmer weather, with longer daylight this is not an issue & i kill the engine then key back to ignition, so pcm is alive & sending data. I know, I need to disable the auto headlights, but they're convenient. So you know i'm not a slacker, I do have the mechanical fan removed and short accy belt skipping the powersteering pump, no A/C to start with. usual high tire pressure, psg side mirror folded in, and a half tonneau cover on the bed.)

I do use the scangauge in hybrid mode so it stays on through all my driving antics, I had assumed that keeping it powered on was the only difference.

Does the scangauge have some other functionality if set to hybrid mode? For example, it could take the last speed seen, and next speed it sees after a shut-off, and make a rough estimate of distance traveled in that time. So then even if your vehicle or, um, driving style, prevents the odo from working all the time, the scangauge would still be accurate.

Wayne makes it sound like it would do this, but it must have to have the vehicle ignition on, otherwise the controllers wouldn't be sending out vehicle speed data. ??

Dale

Hi Daklein:

___I would never call shutting your vehicle off while the motor is not being used atypical, I would call it the future of the automobile. That is how hybrids work quite a bit of the time as well as fuel cut on most modern day FI non-hybrid SI-ICE’s anyway ;)

___About the SG-II. While you are in IG-I (shut down) and there is no data being sent to the OBD port, SG may lock in the previous reading but it will not accumulate distance if there is no distance data being sent. There is no odometer reading in the OBD-II stream so with no data in IG-I, it is not recording anything. In IG-II, now the bus is live, the data stream is intact (waiting for the data feed for some vehicles like Accord’s and Elantra’s that we have driven :() and everything is a go with some delay. We know there is some lock down of a previous reading for a given few ms as you can see this on a recently reset aFCD when going into and coming out of a FAS with the pulse iFE holding the aFCD way down even though the engine is actually off for a few seconds before the data stream updates the SG-II that the engine is shut off and it is not using any fuel while the distance begins its dance. It is a race on the bus as to which reading gets sent and picked up first I believe?

___That may have been the most confusing thing I ever wrote :)

___Good Luck

___Wayne