I'm very interested in making sure my fuel cutoff on the SG II is set correctly. On my daily commute I have a lot of rolling highway hills, and assume I'm getting fuel cut frequently when gliding down hill (coasting in D).

Here is what I am finding for TPS readings on the SG II in my 2009 FEH:
- When in EV (gliding or not): TPS = 17
- Gliding when not in EV: TPS = 14

This morning during warm up I was in Open Loop briefly and TPS was 19. Then it went to 18 when it went closed loop. Instant mpg was < 9999.

I currently have my SG-II cutoff set to 18 or 19 (need to double check). Once the car is warmed up, I see instant MPG=9999 and open loop gliding downhill most of the time (not EV, over 40mph). EV always shows 9999.

The only exception seems to be when SoC goes below 47. With SoC lower than 47 I seldom see 9999 when gliding and SG II also shows closed loop.

-- Rick

 

Now that's what I was getting at about 20 posts ago!

You now need to set LP ( loop ) as one of your gauges.

Coast with foot off the gas with engine running and watch TPS and LP at the same time.

Watch for open LP and note the TPS.

Set your fuel cutoff value to this number +1.

This is where the 2009's are a littte different.
In my 2005, I concur the gliding not in EV number is 14.
I'll double check tonite, but I thought EV was 14 also. ( so I set mine to 15 )
But my car was built 12/11/2004 and has some of the oldest "firmware".

P.S.

The reason NOT to leave it at the "default" of 24 is....
One time, I was going uphill, but uphill very gently... maybe even decelerating gently, and my TPS was 23 and my car went "open loop" and stated 9999 MPG going uphill at 55 MPH!

 

Correction to the last sentence of my previous post. It should read:
"The only exception seems to be when SoC goes below 47. With SoC lower than 47 I seldom see 9999 when gliding and SG II also shows closed loop."

I checked my current cutoff setting and it's at 18.

-- Rick

 

My TPS value at a throttle lift is indeed 14 at slower speeds.
At Greater Speeds ( 50 MPH+ ) the TPS value seems to stay at 15.

On the way home I have rolling hills, but some are quite steep.
I experimented with the LOWEST TPS I could get the car to stay open loop at. Generally, if you "floor it" the car will go into open loop. Then, I can slowly back off, and it will stay in open loop routinely down to 26 or 28 TPS.
Once in a blue moon, it will stay open loop at 24 or 23.

So best setting for the SG? I think you're on the right track with upper teens.
The number is more important to the 2009's.
The 2005's don't go into fuel cut very often, we have to "trick" the car into doing so with any regularity.

HTH,
-John

 

Just checked my '09 FE and it does have fuel cutoff at a TPS of 14 while coasting but sometimes coasting doesn't cause fuel cutoff! I have no idea yet what circumstances have to be met!

 

The 3.0L V6 in the '09 Escape must have got fuel-cut like the 3.0L '10 Fusion which means you are a lucky dog. Now, did you also show 9,999 Instant MPG on your SGII? For some reason even my SGII does not show Open Loop and 9,999mpg 100% of the time when coasting above 40mph. Rick has posted that he does not get fuel-cut unless he has a SoC above 47% which I have not seen as a requirement yet.

GaryG

 

I'm not sure that's it. There are times that my FEH doesn't seem to want to go open loop/mpg 9999 when coasting over 40mph. Recently I have noticed it when below SoC 47 and when it goes back over 47 I get fuel cut coasting. I'll keep watching it.

-- Rick

 

Gary:

Not exactly sure if I was getting 9,999 Instant MPG at the same time but I'll pay more attention to that next time. I'll try to figure out under what conditions Open Loop happens at all. like MPH.

 

Keep in mind that 9999 MPG is the RESULT of open loop + the throttle below your user defined cutoff setting.

9999 MPG really does not tell you any useful data, UNLESS you have the setup done correctly.

I can set the cutoff to a higher number, and get 9999 MPG going uphill with my foot to the floor. Useless to look at the 9999 MPG.

You need to watch for OPEN LOOP during a coasting, no foot on the pedal at all condition, to tell if you are going into fuel cut.

Another method ( built into every Escape with no need for extra equipment ) to detect fuel cut.... is quite simple.... Display your fuel consumption in Metric which flips the divisor.

Instead of miles per gallon, ( which maxes out at 60 or 99 MPG ) you can do liters per 100km ( gallons per mile ) which will go to 0.0 when you are in fuel cut. )

Helpful hint #17.
HTH,
-John

 

Do you feel a small jerk as the FEH goes from fuel-cut at 40mph to EV? Many times I have to be going in the upper 40's mph or higher in "D" to start fuel-cut but when I get it I coast right into EV at 40mph. Of course I shift to neutral once the tach starts to drop into EV. Most of the time my SoC is far below 47% and that's why I don't think it is a condition for fuel-cut. My fuel-cut is from coasting on flat roads because I have no hills. Partial fuel-cut with closed-loop even under 40mph also gives me much better Instant MPG numbers coasting in "D" than my '05 FEH.

GaryG