Official Scangauge II Thread - Share your Data, Discuss Settings ,Problems, Findings!

[BailOut]

The SGII cannot definitively show a DFCO mode because there are no OBDII codes for fuel injection. As such, each manufacturer makes their own codes, and as of today they are proprietary.

I'm not sure why anyone would doubt the existence of DFCO. It's not science fiction. It is documented in many places, and can be tested by any individual using what I outlined here. It's a simple concept, and whether a car has DFCO or not is highly obvious when the test I outlined is performed on a vehicle that doesn't have it (when I tried it on my rental Aveo (I can't believe GM actually produced this car... no thought, no soul, no reliability, CELs at the drop of a hat, etc...) its AT immediately went into a protective mode, and when I tried it on our old Tacoma it was like driving through a meter of water).

There are even varying levels of DFCO. One of the rental cars I got stuck with when my Yaris' door was being repaired was a POS GMC Canyon pickup. It was a real PITA to drive down the mountain because (aside from handling like an overweight marshmallow that would understeer or oversteer but never rail a turn) it took like 3 or 4 seconds of engine braking to start DFCO, but only half of the 6 cylinders. Then, after 8 - 10 seconds more, it would shut the rest of them off. It made for some rather unpredictable but inevitable engine braking.

[Pavel Olavich]

Originally Posted by BailOut

The SGII cannot definitively show a DFCO mode because there are no OBDII codes for fuel injection. As such, each manufacturer makes their own codes, and as of today they are proprietary.

I'm not sure why anyone would doubt the existence of DFCO. It's not science fiction. It is documented in many places, and can be tested by any individual using what I outlined here. It's a simple concept, and whether a car has DFCO or not is highly obvious when the test I outlined is performed on a vehicle that doesn't have it (when I tried it on my rental Aveo (I can't believe GM actually produced this car... no thought, no soul, no reliability, CELs at the drop of a hat, etc...) its AT immediately went into a protective mode, and when I tried it on our old Tacoma it was like driving through a meter of water).

There are even varying levels of DFCO. One of the rental cars I got stuck with when my Yaris' door was being repaired was a POS GMC Canyon pickup. It was a real PITA to drive down the mountain because (aside from handling like an overweight marshmallow that would understeer or oversteer but never rail a turn) it took like 3 or 4 seconds of engine braking to start DFCO, but only half of the 6 cylinders. Then, after 8 - 10 seconds more, it would shut the rest of them off. It made for some rather unpredictable but inevitable engine braking.

I tend to agree with you, however I don't see a need for a special code to signify DFCO, because if DFCO is in process, then the injectors are no longer feeding gas, so then the GPH should be zero, yea? I've got an auto tranny in my Yaris, by the way, and I think DFCO works in conjunction with the grade logic, and torque converter lock up processes, but I can't be so sure. Yet.

By the way, that POS Chevy Aveo is not made by Chevy....it's Korean (Kia or Hyundai)...it's a rebadged POS, for sure...it cost less then our Yaris, but the cost of ownership over 5 years is much more.

A bit off topic, but what kind of oil do you run? What is your change intervals?

Thanks!

[BailOut]

The SGII's GPH reading isn't done directly from a flow meter or anything. It is inferred by your RPM, speed, and air flow. This is why you still see ~0.2 GPH when in DFCO... that's the closest the SGII can get according to its internal math as you're still producing high RPM.

Check your PMs for my oil metrics. I don't want to derail this thread.

[Pavel Olavich]

Originally Posted by BailOut

The SGII's GPH reading isn't done directly from a flow meter or anything. It is inferred by your RPM, speed, and air flow. This is why you still see ~0.2 GPH when in DFCO... that's the closest the SGII can get according to its internal math as you're still producing high RPM.

Check your PMs for my oil metrics. I don't want to derail this thread.

I was under the impression that the GPH value was input to the ScanGauge II via the ODB port, and not calculated by it....I certainly could be wrong however.

[Appalachian Trail 2007]

Originally Posted by Pavel Olavich

I tend to agree with you, however I don't see a need for a special code to signify DFCO, because if DFCO is in process, then the injectors are no longer feeding gas, so then the GPH should be zero, yea? I've got an auto tranny in my Yaris, by the way, and I think DFCO works in conjunction with the grade logic, and torque converter lock up processes, but I can't be so sure. Yet.

By the way, that POS Chevy Aveo is not made by Chevy....it's Korean (Kia or Hyundai)...it's a rebadged POS, for sure...it cost less then our Yaris, but the cost of ownership over 5 years is much more.

A bit off topic, but what kind of oil do you run? What is your change intervals?

Thanks!

It's a Daewoo rebadged to a Chevy