RE: Fuel Computer

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RE: Fuel Computer

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RE: Fuel Computer - 7/9/2008 7:31:39 AM

aftermath360uk

Posts: 5
Joined: 6/17/2008
Status: offline

Well after a fill up mine is still showing 609 miles to go! When infact it''s around 400 miles till (I assume) it would be completely empty. I get around 360 miles untill I have 60 miles left by the computer and the light comes on. This is assuming the computer is 30% inaccuriate.

I will try the method to adjust again.

Adam.

(in reply to NickC)

Post #: 21

RE: Fuel Computer - 7/9/2008 4:16:36 PM

NickC

Posts: 46
Joined: 5/22/2008
Status: offline

I''ve just run another tank through it. I''ve had a couple of trips into London this week for a training course so it''s hit the mpg. The computer said 39.6 average with distance remaining running out at about 465 miles. I filled up at 473 miles with an actual of 39.3 with around 5 litres left. I''m fairly happy with this and after a few weeks of having a fuel computer have decided it''s a bit of a gimmicky boys thing and the guage with the light is really enough. However, it''s there so I''ll have to fiddle with it

(in reply to aftermath360uk)

Post #: 22

RE: Fuel Computer - 7/10/2008 1:31:09 AM

Dads_Taxi

Posts: 124
Joined: 2/4/2007
From: Cheadle, Cheshire
Status: offline

I''ve just had a fiddle with mine!

There seems to be two settings which say "DIS"; number 50 and number 51. On mine, 50 was showing 0 and 51 shows 34.2 (I think, I didn''t write it down but it''s that sort of figure). I changed setting 50 from 0 to -10, hoping that reduces it''s figures produced. I wonder what the other DIS is referring to?

I''ll fill her up soon and report back in a few hundred miles or so. Incidentally I went through the process again and noticed setting 50 had reverted back to 0, which I assume means I could keep on adding or subtracting percentages for ever, it''s not limited to just +/- 15% of wherever it starts. Or it might mean that I didn''t change anything! Anyone know if there is a STORE button or anything else I should have pressed?

Dave.

_____________________________

Mazda 5 2.0D Sport-Nav
Phantom Blue

(in reply to NickC)

Post #: 23

RE: Fuel Computer - 7/11/2008 12:20:17 AM

NickC

Posts: 46
Joined: 5/22/2008
Status: offline

Mine did that too, but the remaining figure definately changed, so I''m assuming the new figure becomes 0 as default. The other setting which needs adjusting is the distance remaining when the tank''s full as 660 miles is a touch wide of the mark.

(in reply to Dads_Taxi)

Post #: 24

RE: Fuel Computer - 7/18/2008 3:08:22 PM

Dads_Taxi

Posts: 124
Joined: 2/4/2007
From: Cheadle, Cheshire
Status: offline

Quick Update. After 3 runs from Cheadle to Southport this week, 396 miles, tank full to tank full again, I''ve acheived 40.5 mpg, and the stupid computer claims 9l/100miles which is 50.5mpg, so it is now 25% inaccurate, not the 18% it was before!!

I have obviously tweaked the calibration the wrong way. Doh !

So if it is reading a too generous figure, it would seem that I need to make a +ve adjustment to the DIS setting.

Dave

_____________________________

Mazda 5 2.0D Sport-Nav
Phantom Blue

(in reply to NickC)

Post #: 25

RE: Fuel Computer - 7/19/2008 10:34:43 PM

NickC

Posts: 46
Joined: 5/22/2008
Status: offline

At least it gives you something to do on these long, dark, damp July days!

(in reply to Dads_Taxi)

Post #: 26

RE: Fuel Computer - 8/5/2008 1:19:40 PM

S1mplicity

Posts: 5
Joined: 8/5/2008
Status: offline

My new Mazda 5 shows a lower MPG figure than I have acheived, trip comp shows 41.0mpg I did 537 from 50.21 litres not bad for the first full tank
That was full tank to full tank 48.98mpg.

Oh lucky me, I do a lot of motorway work normally but that tank was 50/50 about town and motorway without being over cautious as you have to find out how much fun the car is !

_____________________________

Mazda 5 2.0D Sport 2008
Copper RED

(in reply to NickC)

Post #: 27

RE: Fuel Computer - 8/6/2008 12:46:53 PM

tcs17_tim

Posts: 22
Joined: 3/27/2007
Status: offline

I adjusted as per the post but all that changed was the distance to go and not the litres/100. Also when I took it in for its service and recall on the pipe it seemed to get reset again.

_____________________________

2.0 TD (143bhp) Sport
Phantom Blue

(in reply to aftermath360uk)

Post #: 28

RE: Fuel Computer - 8/29/2008 7:02:15 PM

Crippen

Posts: 3
Joined: 8/29/2008
Status: offline

Hi All,

Regarding the fuel computer/guage issues, don''t know if this may help. About 5 years back, we had a Picasso which had similar problems. Sounds like those on the 5 work in a similar way. Here''s some info I was given at the time.

1) The computer works purely in L/100km. It then does the math to convert to MPG. Rounding up/down can induce errors.

2) The sampling rates for the fuel sensor can also cause problems. On the Picasso, the fuel sensors were ''damped'' and only polled every 6 and 80 minutes. The damping being used to cancel errors caused when driving on windy/bumpy roads.

3) When filling, any thing under 6L would not be registered until the sensors are next polled. So stick 5litres in and drive on a straight road for 80 minutes before computer/guage finds the extra fuel.

4) The fuel guage may not be programmed linearly(?) The guage on the Picasso was a strip of 9 leds. I assumed each led = x litres. Not so, each was set to a different amount. If same on the 5, each section of the fuel guage will give differing miles per section.

Hope that helps

Pat

(in reply to tcs17_tim)

Post #: 29