ECU QUESTION


Information and questions on GL1500 Goldwings (1988-2000)
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Abbert55
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ECU QUESTION

Post by Abbert55 »



Hello, I have a (new to us) "91"SE. Had about 100 miles riding when it quit. Luckily, it quit here at the house. In diagnosing the electrical problem of no starter operation, the manual says to check the ECU. Since I have no fuel pump run when ign turned on (yes, I have checked fuel pump and it works when jumpered), manual says faulty ECU. I need directions in removing the harness from the ECU for testing.
Also, the manual shows two different ECU numbers.
1. 30410-MT8-770 90-91 SE
2. 30410-MW5-741 All 91
My question is, will either unit work with our bike? Is one superseding the other?

Thank you in advance for any help you may be able to give.


the_big_h
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Re: ECU QUESTION

Post by the_big_h »

I'm a little confused about the manual saying the ECU is faulty. I only have a manual for a '94 and '95, but I don't see how the ECU is involved in the starter motor circuit at all.
If your issue is the starter motor does not attempt to crank the engine at all, replacing the ECU is not going to help.
There's a bank angle sensor, that will stop Relay6 from operating, and there is some diodes in the circuit, but other than that it is just wires and switches, no other electronics at all. Unless the '91 is so much different from the '94 - which I really doubt.

If the issue is that the engine cranks but does not start, then the ECU could be at fault.

I don't remember where I got the manuals I have, they have very clear drawings and troubleshooting instructions (that don't say anything about ECU in relation to the starting circuit). They may be available for download on this site, else PM me and I can send to you.
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bellboy40
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Re: ECU QUESTION

Post by bellboy40 »

We need some more information to be able to give you any good advice. What exactly does it do, or not do, when you try to start it? Does the starter try to turn the engine over or just nothing happens? Is the neutral light on?
Just for your information, the fuel pump will not run on your bike until the start button is pushed in when trying to start it. It does not run for a couple of seconds when you first turn the switch on like the earlier bikes did.
Abbert55
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1998 Kwik Kamp trailer
1998 Valkyrie... sold
1980 GL1100... sold

Re: ECU QUESTION

Post by Abbert55 »

Sorry, I didn't give more info. Thanks for the reply, here's what I know.
1. relay clicks with ign on.
2a. Headlight off when start button pressed
2b. Starter doesn't run
3. Relay (8?) clicks when start pressed.
4. starter will turn when jumping start A relay.
5. Engine won't start with relay A jumped

I'll be in and out this P.M. if you need more info.

Again, Thanks!
Abbert55
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1998 Kwik Kamp trailer
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Re: ECU QUESTION

Post by Abbert55 »

Just remembered, bike was Roadsmith triked and bank angle sensor was eliminated, I also have a "94" manual and am finding the wiring, circuitry and function is quite a bit different, even the wire colors and tracers. I now have a manual for 88-91. That's where I got the ECU controlling the fuel pump from.

Thanx
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ct1500
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Re: ECU QUESTION

Post by ct1500 »

Abbert55 wrote: Fri Mar 19, 2021 2:03 pm if you need more info.
Again, Thanks!
Larry asked "Is The Neutral Light ON"
Local and need repair help with your 1500, Valkyrie or ST please click contact
Nothing leaves my shop till its' perfect
This is what I do
Abbert55
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Re: ECU QUESTION

Post by Abbert55 »

Forgot, neutral light is on
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bellboy40
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Re: ECU QUESTION

Post by bellboy40 »

With ignition switch 'on' and cruise switch turned 'on', does the cruise light come on? Kill switch turned on?
Check on starter relay "A", if you have battery voltage on the yellow/red wire when trying to start. Check the brown/red also for ground.
Abbert55
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Re: ECU QUESTION

Post by Abbert55 »

Acc side is also live with key on, had a short in taillight circuit, found and repaired it with solder and heat shrink tubing.
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AZgl1800
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Re: ECU QUESTION

Post by AZgl1800 »

the 88-91 is a different animal than the 92-00 bikes

on the 92+ years, the ECU does indeed feed the fuel pump.

IIRC, on the 88-91 a relay is used....

GL1500 Engine Control Module (ECM)
Year Part Number Application
1988 30410-MN5-013 (Gold Wing)
1989 30410-MT2-013 (Gold Wing)
1990 – 1991 30410-MT8-770 (1990 Gold Wing and SE, 1991 Interstate, Aspencade and SE)
1992 30410-MY4-771 (Interstate, Aspencade and SE)
1993 – 2000 30410-MZ3-772 (1993 – 1996 Interstate and 1993 – 2000 Aspencade and SE)

The 1990 - 1991 are the same.
The 1993 – 2000 are the same.
Note 1: The 1988 – 1989 years have 4 connectors for wiring.
1) Black 9-pin, 2) Blue 2-pin, 3) Red 4-pin, 4) White 6 pin.
Note 2: The 1990 – 2000 years have one large connector for wires.


I have attached a mod I did to a '94SE, it will allow you to start it and get home, even if the start button is broke/wires loose, etc.




~John

'02 GL1800
2009 Piaggio MP3 250cc
Abbert55
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Re: ECU QUESTION

Post by Abbert55 »

Thx John. This will be used for future events!
Abbert55
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Re: ECU QUESTION

Post by Abbert55 »

The cruise light does not illuminate with key on, and the kill switch is in run position. That was the first thing I checked LOL. :lol:

I remember when We looked at the bike, I had turned the handlebar to the right when backing up, and it died. Not once but twice at different times. The switches were dry and not making very good contact, so I cleaned them with CRC elect cleaner then silicone spray. Could we be facing a wiring problem in the handles?
Abbert55
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1980 GL1100... sold

Re: ECU QUESTION

Post by Abbert55 »

I cleaned the switches AFTER the no start condition. Now the horn will sound without pressing the button with Samson like force, the hazard lights now work properly and all seems to be working properly, all but the start and cruise.
Abbert55
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1998 Kwik Kamp trailer
1998 Valkyrie... sold
1980 GL1100... sold

Re: ECU QUESTION

Post by Abbert55 »

Thanks everyone for the replies to the problem. Turns out to be a problem with the BAS. Since the bike was triked, I bypassed it knowing that if I go down, chances are I have bigger problems than the BAS will help.

Again, thanks to all.

Al
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WingAdmin
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Re: ECU QUESTION

Post by WingAdmin »

Abbert55 wrote: Sun Mar 21, 2021 10:57 am Thanks everyone for the replies to the problem. Turns out to be a problem with the BAS. Since the bike was triked, I bypassed it knowing that if I go down, chances are I have bigger problems than the BAS will help.

Again, thanks to all.

Al
Did the bypass fail?

The BAS always has to be bypassed on trikes - the lateral forces from a turn (which aren't present when a bike leans through a corner) will trigger the BAS.
Abbert55
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1998 Kwik Kamp trailer
1998 Valkyrie... sold
1980 GL1100... sold

Re: ECU QUESTION

Post by Abbert55 »

No Previous owner had not bypassed the BAS as I found out. I bypassed it and it is running fine now!
Again, thank everyone for the help!


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