Fuel Pump/Ignition Control Unit


Information and questions on GL1500 Goldwings (1988-2000)
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dbaumer
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Joined: Sun Jul 07, 2013 10:51 pm
Location: Longview, Wa
Motorcycle: 1989 GL1500 Goldwing

Fuel Pump/Ignition Control Unit

Postby dbaumer » Thu May 15, 2014 6:26 pm



Does anyone have an good knowledge of the Ignition Control Until.

Here is my issue -

I have a 1995 that i am working on. The cable that goes back to the ignition control unit from the fuel pump is not getting any power to turn the fuel pump on. If i jump the fuel pump to the battery it comes on so i know the pump is good. I am just trying to figure out which wire going into the ignition control unit is the one that tells it when to turn on the fuel pump.



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ct1500
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Re: Fuel Pump/Ignition Control Unit

Postby ct1500 » Thu May 15, 2014 6:54 pm

Are you getting spark at ign plugs? The engine has to be cranking over with kill SW to run or engine running for fuel pump to run, ECM determines this with signal from pulse coils on crankshaft. Power to ECM?
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dbaumer
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Re: Fuel Pump/Ignition Control Unit

Postby dbaumer » Thu May 15, 2014 6:59 pm

Yep we have power to the ECU we checked the pins on the ECU connector and we get power on a good number of them if i have the EUC plugged in and jumpper the fuel pump to the battery i can start it up and run the bike with out any issue. its just when i plug dont jumper it i have the issue. and see no power on the cable going from the fuel pump to the ECU. even when we first turn on the ignition. It acts like the ECU is not telling the fuel pump to turn on .

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ct1500
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Re: Fuel Pump/Ignition Control Unit

Postby ct1500 » Thu May 15, 2014 7:04 pm

If the wire is OK I would say the ECM is NG. Ohm out both pulse coils 1st as a check.
This is what I do
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dbaumer
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Re: Fuel Pump/Ignition Control Unit

Postby dbaumer » Thu May 15, 2014 7:22 pm

im sorry i just wanna make sure i understand what is NG? not good?

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ct1500
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Re: Fuel Pump/Ignition Control Unit

Postby ct1500 » Thu May 15, 2014 7:24 pm

Yup, or NFG..........
This is what I do
Local and need repair help with your 1500, Valkyrie or ST please PM

dbaumer
Posts: 6
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Location: Longview, Wa
Motorcycle: 1989 GL1500 Goldwing

Re: Fuel Pump/Ignition Control Unit

Postby dbaumer » Thu May 15, 2014 7:27 pm

i like it.

this bike has been a pain. the guy that owns it bought it off a buddy of mine that had it for years. with out an issue. withing a month of the new guy owning it he let a mouse get into it and eat his wires and fry a whole bunch of wires that we get replaces. everything works but the fuel pump. I was afraid that the damage got back to the ECU and caused damage.

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ct1500
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Re: Fuel Pump/Ignition Control Unit

Postby ct1500 » Thu May 15, 2014 7:33 pm

I haven't had to dig into an ign system yet myself so I do not know if both sets of pulse coils are responsible for ignition or there might be a shared duty for other functions which is why I suggest Ohm out just to be sure before spending big bucks.
This is what I do
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WingAdmin
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Re: Fuel Pump/Ignition Control Unit

Postby WingAdmin » Fri May 16, 2014 9:58 am

The ECM monitors both pulse generators, and if it is not receiving correct signals, it will not allow the engine to start or run.

The ECM should output +12 volts to the fuel pump both when the engine is cranking as well as when it is running. As shown, it is pin 3 that has that output.

The outputs of the ECM are solid state (no relays) so it's more than possible that if the fuel pump line was shorted out due to mouse damage or whatever, that the fuel pump output inside the ECM could be damaged. It's also possible that this could be repaired - I would have to have a look at the inside of the ECM to know for sure, but most likely it's just a MOSFET that needs to be replaced.

ECM Diagram
ECM Diagram


ECM Connector
ECM Connector

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virgilmobile
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Re: Fuel Pump/Ignition Control Unit

Postby virgilmobile » Fri May 16, 2014 10:40 am

I have been in one.The 12 volt output for the pump is a 5 amp capable transistor.The one I looked at,the transistor was dead.I did replace it and sent it back however the owner already replaced his ECM. Mucho $$$.
I never was able to get confirmation that the repaired ECM worked.The part was cheap too.
As a side note,I suspect that a external problem damaged the ECM.Its output is not fuse protected.
Before replacing the ECM or having it repaired,a current measurement of the pump really should be checked.It must not draw more than 4 amp.If it spikes,the transistor will be damaged.a bad pump,pinched wires are suspect cause of a dead pump circuit.

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Fuel Pump/Ignition Control Unit

Postby virgilmobile » Fri May 16, 2014 12:28 pm

Here's a post from a while ago about the problems and findings..viewtopic.php?f=6&t=14339

Keep us informed please...

dbaumer
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Re: Fuel Pump/Ignition Control Unit

Postby dbaumer » Fri May 16, 2014 12:35 pm

Thank you all. I will keep you update with what i find. I wont be able to do any testing till tomorrow afternoon.

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WingAdmin
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Fuel Pump/Ignition Control Unit

Postby WingAdmin » Fri May 16, 2014 12:44 pm

virgilmobile wrote:I have been in one.The 12 volt output for the pump is a 5 amp capable transistor.The one I looked at,the transistor was dead.I did replace it and sent it back however the owner already replaced his ECM. Mucho $$$.
I never was able to get confirmation that the repaired ECM worked.The part was cheap too.
As a side note,I suspect that a external problem damaged the ECM.Its output is not fuse protected.
Before replacing the ECM or having it repaired,a current measurement of the pump really should be checked.It must not draw more than 4 amp.If it spikes,the transistor will be damaged.a bad pump,pinched wires are suspect cause of a dead pump circuit.


I knew you had replaced a transistor in one, I couldn't remember if it was a GL1200 or GL1500, and which output line it was. Glad your memory works better than mine. :)

I did the same thing recently in the $100 docking station for my Roomba robot vacuum cleaner. The thing had been engineered with a 14 volt MOSFET to switch the charging circuit on and off, when the charging voltage was 13.5 volts. One little surge, and goodbye MOSFET. I yanked it and tacked in a 40 volt P-channel that I had in a bin, it now works as good as new (better, actually).

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curley
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Re: Fuel Pump/Ignition Control Unit

Postby curley » Fri May 16, 2014 12:51 pm

WASG...faulty/shorted Tip Over Switch?....had to replace mine ( a '93) as there was a recall for the early years ( the dampening fluid would leak out and when you went over a bump the bike dies)...the TOS switch on my '93 is above or near the right top shock mount ( rt= twist grip side of bike)...hope this helps




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