Fun and Games with an old K1100LT

[beemuker]

"Now that you've verified that power is being provided and that your pump is capable of running, you need to check whether it is getting switched on correctly.  Power at pin 30 of the fuel pump relay will supply the power to the tank connector.  If you don't read voltage at the fuel tank connector harness side when you switch on the ignition, start tracing  power to the fuel pump relay coil.  It starts at the ignition switch, travels through the side stand switch, through the fuel pump relay coil and finally to the Motronic switched ground lead."

I've reread all the suggestions but I'm at a loss where to go from here. now that I have a clear wiring diagram I'll try to figure out why power to pump is not getting switched on. Ihope it's not a problem with the moto's "brain" , just my brain.

I read through Vogel's K bike flow chart, but part of the troubleshooting chart is cut off? My problem also seems to start at the turning on of the key, when my fuel pump should pressurize.

[Laitch]

Where are you viewing the chart and on which device are you viewing it? Have you found the diagnostic plug under the seat? Keep in mind that Vogel's chart is for a 2V Brick. There are a few differences.

Did you find power at the fuel injection relay?

[beemuker]

Where are you viewing the chart and on which device are you viewing it? Have you found the diagnostic plug under the seat? Keep in mind that Vogel's chart is for a 2V Brick. There are a few differences.

Did you find power at the fuel injection relay?

viewing the chart on a chromebook from electrical diagrams on this forum, was using it to see what I could possibly do next.
no, haven't found diagnostic plug. should I look for it and what should I do when I find it?
yes,at relay pin 30, no at 85, stand up
muchas gracias for the help

[daveson]

Power to the side stand swiych from a green/yellow wire, goes to the fuel relay through a green/red wire.

[Laitch]

viewing the chart on a chromebook from electrical diagrams on this forum, was using it to see what I could possibly do next.

You want to see that chart in its entirety, go to the K100-forum's Portal, click on the Tech Page link then find the document Troubleshooting The ECU.

yes,at relay pin 30, no at 85,
muchas gracias for the help

De nada. Just to review technique, watch this. You know, rbm and daveson can't always be here    and Gryph is apparently busy keeping neighbors off his lawn a lot of the time, when he isn't captaining on the Lake.





 

[beemuker]

Thanks again Laitch.
I'll test the relays tomorrow after I test my boat engine  in the water. Finally got the boat engine to pee. I took the water pump apart and reassembled. I believe my problem was that the plastic key that drives the impeller had slipped  and the impeller wasn't engaged. I could have saved myself a lot of effort by testing it manually before I put it back on the engine, but since I need to do this often as we have shallow water with a lot of sand, I'll be a lot more competent.

[Laitch]

I believe my problem was that the plastic key that drives the impeller had slipped  and the impeller wasn't engaged. .

Like in Reply #35? 

[beemuker]

I tested the 4 pin relays, they all test good.

[Laitch]

Pulled the fan relay, same thing. Am I doing something wrong?

We don't have anyway to know whether you can follow directions or if you have setup your multimeter for the test correctly. You've been successful getting motos to run acceptably in the past. I usually review all instructions twice and test twice.

How many terminals on this relay?

Call the local auto parts stores and tell them which relay you need.

[beemuker]

We don't have anyway to know whether you can follow directions or if you have setup your multimeter for the test correctly. You've been successful getting motos to run acceptably in the past. I usually review all instructions twice and test twice.

How many terminals on this relay?

Call the local auto parts stores and tell them which relay you need.

the relays are 4 pin, and the youtube was good at explaining how they work, thanks for that. I retested, the relays are fine, had meter set to wrong scale. I can usually follow directions, but ...

[beemuker]

Moto will crank with side stand up or down.

[daveson]

But do You have power at the green/red wire of the fuel relay when you press the start button? I'm guessing it's pin 86.

[beemuker]

Yes with the side stand up no inside stand down

[daveson]

Can you give a summary.

Do you have power at the pump with the start button pressed? Is earth to the pump good?

[beemuker]

But, I get power to pin 87(2grn/white wires) , ignition on, starter depressed, so that should power the pump? No power with stand down,.

[beemuker]

Can you give a summary.

Do you have power at the pump with the start button pressed? Is earth to the pump good?

i’ve got the tank off and the pump out but I didn’t before I took the tank off I can put it back together and re-check anything I should do before I put the tank back on it’s a lot harder to access the relay box with the tank on even propped up. Both wires showed continuity from the four pin outside the tank to the two wires going to the pump.

[beemuker]

Does the fuel relay click when it gets power to 86?

yes

[daveson]

Ah I just deleted that cause I missed your reply about power to 87.

I usually promise myself not to reply to k1100 threads. Is the relay four pin? Do you have a less important one with the same part number to try. Spose the contact inside isn't good, it could show continuity but not enough power for a pump.

With the help of a screwdriver, can you hear a clicking from the injectors with the start button pressed?

[beemuker]

Ah I just deleted that cause I missed your reply about power to 87.

I’ve checked all the four pin  relays and they all appear to be operating as designed, The previous owner said all was well before he let the bike sit and the battery died and the fuel went bad I believe it had water in the tank too since the fuel cap was on backwards the wire is going to the pump from the sender are cracked but I think it Beyond my soldering skills to solder new wires on but the cracks really shouldn’t affect the pump getting power unless the wires were shorting out right

[beemuker]

Looking at the wiring diagram if I’m getting power at the green white on the fuel pump relay I should be getting power to the fuel pump unless unless the other wire going to the motronic can keep it from getting power somehow

[beemuker]

It’s looking doubtful that I’ll be able to mix it up with the Harley boys at thunder Beach this weekend

[daveson]

There are two green/white wires from the fuel relay, one goes to the pump, one goes to the injectors.

If the pump works with a jumper wire from 30 to 87, you might have a bad relay.

[beemuker]

There are two green/white wires from the fuel relay, one goes to the pump, one goes to the injectors.

right you are , the L/Br goes to the mototronic. I’m thinking that this Hasto be the wires from the fuel level sander to the pump even though they’re showing continuity.

[beemuker]

When I checked for voltage at the four pin connector yellow wire I only get about 7 V side stand up.

[daveson]

L/Br would be earth from the computer, you have power at 87, so the computer is allowing earth.