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atlantaboblutz@live.com
Big Brick Rider
Joined: 10 Nov 2011
Posts: 60
Location: Atlanta, Georgia
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 Posted: Wed Jul 10, 2013 5:51 pm Post subject: Re: Can someone run a quick test. |
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| whyoldbill wrote: | | atlantaboblutz@live.com wrote: |
thanks... short of being able to swap parts, this might help.
The other thing, if the ohms of resistance could be checked between pin 6 on the Motronic connector and ground as well as pin 27 of the Motronic and ground, that would be helpful. On mine, I have 9.3 ohms of resistance WITH THE KEY OFF at both pin 3 and pin 27. |
The 12V between White & Green on the Tank connector stays at 12V as long as the key is on.
The impedance between Pin3 and ground is 10.0 ohms, Pin27 and ground is 9.4 ohms.
I'd look at the 12V feed to the fuel pump relay and the signal feeding the coil on the fuel pump relay.
Thanks a bunch. The impedance difference on pin 3 doesn't seem significant enough to matter. Your reading with the tank DISCONNECTED eliminates everything on the tank side of the circuit.
Bill |
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Thanks,
Bob
Atlanta GA
'94 K1100 LT
'76 R75/6 |
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whyoldbill
Flying Brick Rider
Joined: 12 Jun 2006
Posts: 440
Location: in the boonies, northwest of Columbus, Ohio
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| Posted: Wed Jul 10, 2013 6:23 pm Post subject: |
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Correction:
I went back out after I saw that you said Pin 6 and I thought I checked 3. First of all, I was checking the wrong pin. I took the connector apart to get the correct pin numbers, here are the new findings:
The impedance between Pin 6 and ground is 326K ohms with + lead on the Motronic connector and 1.2 ohms with the - lead on the motronic connector, Pin27 and ground is 9.4 ohms both ways.
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'02 - GL1800
The desired effect is what you get when you improve your interplanetary funksmanship - George Clinton |
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atlantaboblutz@live.com
Big Brick Rider
Joined: 10 Nov 2011
Posts: 60
Location: Atlanta, Georgia
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| Posted: Wed Jul 10, 2013 8:01 pm Post subject: Unbelievable. |
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Well, been poking all around with the wiring diagram...seems that's been my life for a while  .... and on a whim disconnected the O2 sensor since I know that is part of what the motronic is looking at.
Well, I then read 12v on the lead to the fuel pump that didn't drop within a second. Then... all excited ... I hooked up the tank... fuel pump whirred just as it should. Well, I'm way past being too confident, but this is progress.
_________________
Thanks,
Bob
Atlanta GA
'94 K1100 LT
'76 R75/6 |
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kirkkw
Big Brick Rider
Joined: 11 Jan 2004
Posts: 67
Location: Near Austin Tx
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| Posted: Wed Aug 21, 2013 6:09 pm Post subject: Re: Unbelievable. |
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| atlantaboblutz@live.com wrote: | Well, been poking all around with the wiring diagram...seems that's been my life for a while .... and on a whim disconnected the O2 sensor since I know that is part of what the motronic is looking at.
Well, I then read 12v on the lead to the fuel pump that didn't drop within a second. Then... all excited ... I hooked up the tank... fuel pump whirred just as it should. Well, I'm way past being too confident, but this is progress. |
Its been a few weeks, what is the final verdict?
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1996 K1100RS, 1976 CB750A, 2017 Triumph Trophy, 2020 R1250RT, 2022 RE Classic 350 |
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atlantaboblutz@live.com
Big Brick Rider
Joined: 10 Nov 2011
Posts: 60
Location: Atlanta, Georgia
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| Posted: Fri Aug 23, 2013 10:16 am Post subject: Re: Unbelievable. |
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| kirkkw wrote: | | atlantaboblutz@live.com wrote: | Well, been poking all around with the wiring diagram...seems that's been my life for a while .... and on a whim disconnected the O2 sensor since I know that is part of what the motronic is looking at.
Well, I then read 12v on the lead to the fuel pump that didn't drop within a second. Then... all excited ... I hooked up the tank... fuel pump whirred just as it should. Well, I'm way past being too confident, but this is progress. |
Its been a few weeks, what is the final verdict? |
Thanks for asking!!!
All is now "good". This was quite a journey. There are some items I replaced that were unnecessary (motronic & fuel pressure regulator) and a number of components I replaced in process of diagnosing the problem that had nothing to do with it such as the fuel lines that were discovered to be stiff and weather checked and the fuel pump - which I'm happy I did irrespective of this issue.
I do not regret replacing these items on a 20+ year old bike which I intend to keep for some time and enjoy riding... is very comfortable and runs with any sport touring bike out there.
Clearly what happened was that when a short developed (likely related to the O2 sensor) the bike experienced a amperage surge which impacted the diagnosis process.
Since the on-board computer is VERY limited in the diagnostic codes, there is still "elbow grease" required to track down such problems. One generation newer and I suspect the richer set of codes out of the computer allows narrowing very quickly. Unfortunatly many dealer techs have become very reliant on diagnositic codes.
The dealer was actually pretty straight with me that if I had taken it in and simply said "fix it" ... it was equivalent to openning my checkbook to a tech essentially poking around.
I'm glad I did this myself becasue the "good to do" maintenance like fuel line replacement will mean extended reliability over the long term.
Did I mention I really enjoy riding this bike?
_________________
Thanks,
Bob
Atlanta GA
'94 K1100 LT
'76 R75/6 |
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kirkkw
Big Brick Rider
Joined: 11 Jan 2004
Posts: 67
Location: Near Austin Tx
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| Posted: Fri Aug 23, 2013 11:52 am Post subject: Re: Unbelievable. |
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| atlantaboblutz@live.com wrote: |
Thanks for asking!!!
All is now "good". This was quite a journey. There are some items I replaced that were unnecessary (motronic & fuel pressure regulator) and a number of components I replaced in process of diagnosing the problem that had nothing to do with it such as the fuel lines that were discovered to be stiff and weather checked and the fuel pump - which I'm happy I did irrespective of this issue.
Clearly what happened was that when a short developed (likely related to the O2 sensor) the bike experienced a amperage surge which impacted the diagnosis process.
Since the on-board computer is VERY limited in the diagnostic codes, there is still "elbow grease" required to track down such problems. |
So was the short in the O2 sensor?
Did you prove this by changing the O2 sensor after all the other changes didn't fix the problem?
Ken
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1996 K1100RS, 1976 CB750A, 2017 Triumph Trophy, 2020 R1250RT, 2022 RE Classic 350 |
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