K11 Owners Group

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

I have a '93 K1100LT and have been lurking in the shadows learning from your experiences. I bought it in Feb '10 and love it. It ran like a demon but knew that it needed some cosmetic work. I have an issue now and need to plug into your vast knowledge. I went for a ride on Christmas Eve and wound up getting home on the back of a tow truck about 9pm much to the dismay of my better half.

The problem I am having is that the fuel pump will not power up. I have read some of the other postings but can't isolate the problem. I have pulled the pump and hooked it to 12V and it spins. I have traced the wiring from the 4 wire connector to the fuel pump leads and they test out OK. The issue is that when I test the connector on the other side I get no reading from the green/white wire and brown wires when I turn on the ignition. Everything else lights up and it will crank. This would seem to indicate that the pump is not getting voltage. I have swapped out the relays and checked the fuses. Does this mean that the motronic brain is bad? A short in that portion of the wiring harness? I'm struggling as to where to go with this and not just "rip and replace".

I have it in the basement now and have removed the fairings, tank, fuel pump and may be in the process of painting it. Suggestions would be welcomed.

Also, when I ground out the #2 pin it does not display any codes but goes straight into the fan test after about 5 seconds, normal?
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'93 K1100LT

Flying Duck · Posted: Thu Jan 13, 2011 6:10 pm Post subject:

Those four lead connector for the fuel tank is a weak spot. Use a voltmeter to see if power is coming out of the fuel pump relay on the green/white wire.
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93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

dwerbil · Posted: Thu Jan 13, 2011 9:12 pm Post subject:

robleyd · Posted: Thu Jan 13, 2011 9:24 pm Post subject:

If you can find something like http://www.narva.com.au/products/browse/waterproof-connectors-2 in your part of the world, it might be even better.

Local price is around five bucks.
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David, owner of:
1996 K1100 LT

dave n · Posted: Fri Jan 14, 2011 1:21 am Post subject:

make sure that the kill switch is in run position (damhik)
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Dave Norris KOG 248
1999 Cagiva Gran Canyon
1993 K1100LT w/Hannigan sidecar
2008 Suzuki DR650

DLBass · Posted: Fri Jan 14, 2011 6:08 am Post subject:

Sidestand cutout switch fault??
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There is only now, yesterday is gone and is unchangeable, tomorrow is uncertain. Live in the moment.

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

Still not sure which way to turn, replaced connector with 4 line flat connector, swapped relays repeatedly and still no power to fuel pump. Tested on relay side and no power on green/white and brown wires, there is voltage on the white and yellow side (feeds the fuel level indicator I think).

Suggestions welcome...ECU may be next at $175.
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'93 K1100LT

Flying Duck · Posted: Mon Jan 17, 2011 1:23 pm Post subject:

The white wire is for the idiot light in the cluster and the yellow wire is for the fuel gauge.

Did you check the sidestand switch?
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

Sidestand switch is bypassed (2 wires are soldered together).
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'93 K1100LT

Flying Duck · Posted: Mon Jan 17, 2011 5:34 pm Post subject:

Have you checked the fuel pump fuse? (#6)

Check that you have 12V coming into the fuel pump relay on the red/green wire.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

Rechecked fuse, moved relays around and have 12v coming into red/green. Electronics are so much fun!
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'93 K1100LT

Flying Duck · Posted: Mon Jan 17, 2011 9:58 pm Post subject:

FYI: The fuel pump relay trigger gets power from the kill switch via the sidestand switch on a green/red wire. That should always be hot when the bike is turned on and the kill switch is in the run position.

The relay is triggered by a ground signal from the Motornic via the blue/brown wire. Once it's done the intital one second priming, I'm pretty sure that what then causes the Motronic to trigger the relay is the signal it gets from the Hall Effect sensor to let it know that the engine is turning/running.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

So to test that sequence I should be able to temporarily ground the blue/brown wire to complete the circuit and test the pump circuit while bypassing the Motronic?

Is there a way to test the Motronic, can the dealer?
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'93 K1100LT

Flying Duck · Posted: Wed Jan 19, 2011 5:27 pm Post subject:

1) Yes. Also make sure you're getting at the green/red positive trigger wire - use a voltmeter.

2) Not sure but don't think so.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

Update...I think I have a short in the wiring harness between the relays and the 4 wire connector. Testing the wires there is continuity of about .5 between green/white at connector and green/red at relay but there is .01 between green/white and brown/blue at relay. Same on the brown to those as well. Know of a cheap wiring harness or should I break it open or just run some new wire from the connector to where it it connects (not sure where that is). Thanks for your help and advice is welcome.
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'93 K1100LT

mdmgolfr · Joined: 23 Jan 2010 Posts: 7 Location: Cumming, GA

I got a used wiring harness and installed it...voila...fuel pump primes like it should. Must have been a short in the harness somewhere.

While I have it in pieces, is there anything I should do before putting it back together? I'm probably going to paint it a dark blue.

I appreciate your help!
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'93 K1100LT

dwerbil · Posted: Sat Feb 05, 2011 6:27 pm Post subject:

Good going! The same problem and the same fix for me happened some months ago.
Anytime I have the fuel tank off the bike, I do a look-see around the wiring connections...to be sure things are not getting pinched, damaged, etc.
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93 K1100RS ~ 2004 R1150RT ~ 84 RS ~ 78 R100/7 ~ 65 R60/2
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Randy at Round Rock, Texas