GL1500 dies when selecting 1st gear


Information and questions on GL1500 Goldwings (1988-2000)
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carlleroux6
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Joined: Tue Dec 10, 2013 11:45 am
Location: Cape Town, Western Cape, South Africa
Motorcycle: 1992 gl 1500

GL1500 dies when selecting 1st gear

Postby carlleroux6 » Tue Dec 10, 2013 2:21 pm



Neutral light is on, side stand is up but dies when selecting 1st gear. Checked neutral switch(l/h side),
Reverse switch, side stand switch,clutch lever switches and all seem OK. ( testing continuity etc)
Any help as I am close to giving up. Can the gear selector indicating switch(front) cause this?



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virgilmobile
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Tue Dec 10, 2013 2:46 pm

Gear selection will kill the engine if the side stand switch does not ground the green/white wire.
There is no visible indicator if that part of the switch is working...You could test this by connecting a wire to the side stand switch green/white wire and attaching it to ground..effectively bypassing this safety switch.temporarily.
Obviously,just unplug the sidestand switch and jump the 2 wires together and test it.

carlleroux6
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Joined: Tue Dec 10, 2013 11:45 am
Location: Cape Town, Western Cape, South Africa
Motorcycle: 1992 gl 1500

Re: GL1500 dies when selecting 1st gear

Postby carlleroux6 » Wed Dec 11, 2013 1:36 pm

Thanks Virgil,
Forgot to mention I am from sunny South Africa. That is about it as far as goldie knowledge here goes.
Will try tomorrow and let you know the results.

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virgilmobile
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Wed Dec 11, 2013 1:41 pm

Let us know.
Your not the only one on this site from that area.All are welcome here.

carlleroux6
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Location: Cape Town, Western Cape, South Africa
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Re: GL1500 dies when selecting 1st gear

Postby carlleroux6 » Thu Dec 12, 2013 12:40 pm

Hi Virgil,
I did the tests prior to asking but was in doubt. Anyway did as you suggested with the same results.( dies when put into gear).Before I go and do the diode test etc, could you please tell me what switch/relay is activated when you select gear. Remember this is 1992 15000 SE. It does not have digital gear selection on board display. There is no switch on the front engine cover. If I can find this switch, then I can trace it backwards. Obviously the system does not recognize that all parameters are OK when in gear.
Any help will be appreciated. By the way we do bike to trike and trike to bike. If you are interested I can show some snapshots.
Thanks again Carl

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virgilmobile
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Motorcycle: 1988 GL1500 I
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Thu Dec 12, 2013 3:43 pm

I'll get into be schematic today and post what I can find.
In the mean time.centerstand the bike so the rear wheel is clear and try it again.
I had one bike that had a stuck clutch.Stuff it in gear and it would kill the engine.

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virgilmobile
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84 GL 1200 I

Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Thu Dec 12, 2013 3:50 pm

By the way,as I recall,the diodes are used for cranking and reverse circuits.They shouldn't affect the ignition.
Also the gear selector switch is inside the engine.Behind the lower front cover.It is plugged into the harness .
One more thing.Does your side stand lamp light up on the dash.?

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virgilmobile
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Thu Dec 12, 2013 5:07 pm

By all means,show the pictures....
Here goes on the theory of the side stand safety system....As best as I can determine...

Bike running....Neutral light on...Side stand up and it's light is off...Put the bike in gear...

Ignition is killed by a circuit in the ECM module when ...

The neutral light goes off(Light green/red wire ungrounded) AND the side stand is down...(green/white not grounded)
I can only assume that because there is no First gear contacts in the gear selector switch,The ECM only monitors the neutral switch and the side stand switch.

I would unplug the ECM and test continuity at the plug.
Verify that the neutral wire actually goes to zero ohms when in neutral and no continuity in gear...
The side stand switch must go to zero ohms when in the up position and no continuity when down.
If one or the other is not correct,the ignition quits.

These are the only 2 circuits that can shut down the ignition as a safety that I can find...
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virgilmobile
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Thu Dec 12, 2013 10:18 pm

OK,I just proved my theory only 88.
On my bike,I can bump the shift lever up and down a few times and the neutral lamp will go off even tho it's in neutral. It is a bad switch.
At that moment with the engine running and the side stand up,when I put down the side stand light comes on and it kills the engine.

So the ECM does use the neutral circuit and the side stand switch.
That's how the ECM knows when your in gear,the neutral lamp goes off.

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virgilmobile
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Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Fri Dec 13, 2013 9:57 am

Also....the grounds....
The 1500 uses a unique method to combine common grounding...
Rather than running a bunch of green wires to a single lug on the frame,They opted to use a common plug....Look for it....
Here's a link to more information about it....
Obviously a bad ground can false trigger the ECM too...
http://www.goldwingfacts.com/forums/2-g ... emlin.html

carlleroux6
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Re: GL1500 dies when selecting 1st gear

Postby carlleroux6 » Mon Dec 16, 2013 2:09 am

Hi Virgil,
Sorry it took so long to reply but could not log on for some reason. Any way your last post makes a lot of sense. After going through hundreds of tips/schematics/manuals etc I must agree with you. This model(1500 SE 1992) does not have on dash gear position indicator. It on has the switch (as you said under front cover) that is on or off. Studying the electrical schematics it seems as the earth wire is interlinked right through to the diode assembly. It was mention that this happened when the wing went over a speed hump. For a short while the only way the wing would go was if the side stand was down while riding. It then finally gave out. I am going to do the final complete checking of all related switches and then check grounding. After that I will check continuity from all switches to the relevant end points. Then check fuses and lastly the diode assembly. Hope to pick up something along the way. Hold thumbs. Will report back. Will be a battle though as it is 37 degrees C today.

carlleroux6
Posts: 6
Joined: Tue Dec 10, 2013 11:45 am
Location: Cape Town, Western Cape, South Africa
Motorcycle: 1992 gl 1500

Re: GL1500 dies when selecting 1st gear

Postby carlleroux6 » Wed Dec 18, 2013 12:56 pm

Hi Virgil,
Did the test on the switches and all seems fine. Checked the gear position selector switch (this model only shows OD-overdrive)
When I connected the ground wire to permanent ground(neutral light showing on dash) I could select gears without the bike stalling.
I the saw the wires running to a relay on the right side of the bike (right front fairing) I am going to replace this relay(omron) which is available here. Will keep you posted.
Carl

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virgilmobile
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83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1500 dies when selecting 1st gear

Postby virgilmobile » Wed Dec 18, 2013 1:11 pm

I don't remember any relays in the circuit.I wonder if its a aftermarket kill system (anti-theft) or some European wiring change from the US model.
I'm interested what makes the relay click.A hidden switch perhaps?
Or a previous owner modification.
Many questions.Keep us updated.Take pictures of where the relay is at too.

carlleroux6
Posts: 6
Joined: Tue Dec 10, 2013 11:45 am
Location: Cape Town, Western Cape, South Africa
Motorcycle: 1992 gl 1500

Re: GL1500 dies when selecting 1st gear

Postby carlleroux6 » Sat Dec 21, 2013 7:49 am

Hi Virgil,
Just to inform you I modified the circuit to tell the system the wing is neutral. Wing operates fine and even shows OD. Today a USA made 3 wheeler came in. We had to strip it down for repairs. I then saw that in the relay box(next to the fuses) there is a relay that reads position. I am wondering if this could be the culprit (gear position?). The previous owner had an urgent rally to attend and could not wait. So when he brings the wing back I am going to test that part of the system. Will keep you posted.

bigl54
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Re: GL1500 dies when selecting 1st gear

Postby bigl54 » Sun Dec 22, 2013 5:46 pm

That happened to mine and I found a short in wiring of kick stand switch. Put a new one on , and it fixed it




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