Author Topic: Excess fue consumption / F1 code 25 / Unidentified black box.  (Read 343 times)

Offline Weggy13

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Hi all,
I have just recently (2 weeks ago) acquired a 2003 ST1300 on the advice of everyone I talked to about them. Great ride, although Iíve only done school drop off and work trips, but I have a problem with the F1 lights showing code 25, right knock sensor. Havenít had a chance to take the fairings off and check sensor etc but the other problem I have is that riding to work this morning (approx 70km trip) and a couple of time last week, it feels as if the bike is either getting too much or not enough fuel. On the Highway at 80-100, accelerating fees like the engine is going to stall out, coughing and farting, nearly bucking me off. I put a bottle of injector cleaner in on Saturday with a full tank thinking perhaps stale fuel from previous owner, no help so far. Bike seemed to be going fine before accelerating hard off the line at lights and staring the f1 light. Any help appreciated with any light anyone may be able to shed? Another seperate question is I have a small black box attached under my seat, unsure if anyone can
any light on what this may be, photo attached.



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Online cravenhaven

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #1 on: March 08, 2021, 08:57:15 AM »
Dont know what the black box is. The F1 error 25/26 will most likely be caused by an ECU error and the only way to fix it is to replace the ECU.
In the interim, if the F1 illuminates then you need to shut off the power and restart otherwise the ECU runs in limp mode. I used to do this regularly by pulling in the clutch, flicking off the handle bar power switch, then flick it back on and restart.
I managed to pick up a second hand ECU which solved my F1 problem. I had already replaced some of the knock sensor wiring and one of the plugs to no avail.
 

Offline Weggy13

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #2 on: March 08, 2021, 09:22:28 AM »
I donít suppose it as easy as sourcing another ecu and plugging it in? Also what is an ecu worth if anyone knows? Sorry, extremely new to this and probably asking questions that have already been answered multiple times.
 

Offline Gadget

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #3 on: March 08, 2021, 02:18:58 PM »
If start with making sure the 5-way vacuum hose connector is clear.

It connects the inlets to the MAP sensor which in turn connects to the ECU.

It is a simple(ish) job, costing little, and there is a detailed "How To" with photos here on the forum.

The 5-way gets suits in the valley and unfortunately was mounted low, so any fuel left in the manifold on shut-down can drain into the connector and over time, the additives accumulate as a thick waxy paste.

Once the 5-way proven clean and clear, and if it doesn't solve the problem, then look for more expensive solutions.

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Online cravenhaven

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #4 on: March 08, 2021, 03:14:09 PM »
Actually it is as easy as plugging in a replacement ecu. You'll also need the key (and chip) that matchess the ecu hiss.
 

Offline Shiney

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #5 on: March 08, 2021, 08:16:01 PM »
Here is the link to cleaning the 5 way connector Gadget was talking about:
     http://ozstoc.com/index.php?topic=5870.msg76631#msg76631



And here is a guide on how to reset the ECU which will clear the error:
     http://ozstoc.com/index.php?topic=11334.0


I hope this helps :thumbsup

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Offline Weggy13

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Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #6 on: March 08, 2021, 08:20:25 PM »
Thanks for all the help guys, Iíll give the 5 ways a go and also double check my k&n filter as I have read they can be problematic depending on the cover of it.


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Online LindsayGT

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #7 on: March 09, 2021, 11:46:33 AM »
Thanks for all the help guys, Iíll give the 5 ways a go and also double check my k&n filter as I have read they can be problematic depending on the cover of it.


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Chuck your k&N filter in the bin and get an OEM filter or good quality paper filter.
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Offline Weggy13

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #8 on: April 15, 2021, 04:39:14 PM »
Quick update to this one for anyone interested. I found out what the black box is, it is a http://www.tficontrollers.com/TFI-support.asp
I think this thing may be contributing to my lousy fuel consumption (approx 270 from last tank) and overfuelling / fouling the clutch side plugs / possibly triggering the knock sensor, I have replaced both sensors but Iím still getting the dreaded fi code 25. Iím starting to think Iíve possibly been sold a lemon.  :cuss
 
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Online cravenhaven

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #9 on: April 15, 2021, 05:27:34 PM »
That's terrible fuel consumption. Have you removed the black box?.
I just got used to not revving over 4200 rpm and on the odd occasion that I did, reset it on-the-go as I mentioned above. Normal cruising I get over 500km/tank.
These bikes are getting old now, so there are more turning up as part-outs. Just keep an eye out for a <2008 model (ECU changed around then).
 
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Offline Gadget

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #10 on: April 15, 2021, 11:22:35 PM »
Hmmm, a compression test might be in order.

Any worn rings, I know that's rare on these bikes, however; if it sat idle for too many months, there may have been metallic bonding, and resulting low compression.

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Offline West Aussie Glen

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #11 on: April 16, 2021, 12:45:58 AM »
I have an ECU and 2 keys. For the cost of postage I am happy to lend it to you to try. If it works happy to sell it to you.
Glen
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Offline Weggy13

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #12 on: April 16, 2021, 08:47:11 AM »
I have an ECU and 2 keys. For the cost of postage I am happy to lend it to you to try. If it works happy to sell it to you.
Mate, that would be amazing, I will see if I can work out how to send you a direct message. Cheers.
 

Offline West Aussie Glen

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Re: Excess fue consumption / F1 code 25 / Unidentified black box.
« Reply #13 on: April 16, 2021, 09:07:28 AM »
I have an ECU and 2 keys. For the cost of postage I am happy to lend it to you to try. If it works happy to sell it to you.
Mate, that would be amazing, I will see if I can work out how to send you a direct message. Cheers.
I have sent you an email and a pm with my phone number.
Glen
Safe Riding
Sold
1948 James 98cc 2 Speed, 1969 Suzuki A100-2
1970 Suzuki T250 Hustler, Honda CL100 (125cc)
Yamaha RD250C, 1985 Kawasaki GPZ250
BMW K75S, 78 Yamaha XS11
Yamaha Royal Star Tour Deluxe, 88 GL1500, 99 SE
GL1500
In the shed
85 Kawasaki  LTD250
88 GL1500 Outfit
08 ST1300
2013 GL1800