Check engine light -

[joepua]

Hi all,

Does anyone have the wiring diagram to the check engine light? I've got an '04 GS500F.

I changed the pressure sensor out and the check engine light is still flickring. I was sitting in a grid lock, and the engine light stayed on. Is there a temperature sensor I should check? Anyone have any ideas as to why this light is still wacky? The bike is still running fine.

[scottpA_GS]

 
The GS Does not have a check engine light

What color? You mean your oil light maybe?

[DoD#i]

The red one is wired to an oil pressure sensor/switch - nothing else. Orange is power, green/yellow is to the switch, the switch goes to ground when the oil pressure is too low, the light comes on. Simple, very simple.

If it's on, you have trouble. Big Trouble, usually.

[tussey]

Hi all,

Does anyone have the wiring diagram to the check engine light? I've got an '04 GS500F.

I changed the pressure sensor out and the check engine light is still flickering. I was sitting in a grid lock, and the engine light stayed on.

Check your turn signal fluid. common problem on the gs500. 

[joepua]

The red one is wired to an oil pressure sensor/switch - nothing else. Orange is power, green/yellow is to the switch, the switch goes to ground when the oil pressure is too low, the light comes on. Simple, very simple.

If it's on, you have trouble. Big Trouble, usually.

Ya, the oil light is what I am referring to.

I've changed the pressure sensor switch, so it can't be that, I think. If it was oil pressure wouldn't my motor be toast by now? Is there anything else I can check?

[tussey]

Hi all,

Does anyone have the wiring diagram to the check engine light? I've got an '04 GS500F.

GS500F
http://img.photobucket.com/albums/v300/tdan553527/Page26.jpg

For reference GS500E
http://wiki.gstwins.com/index.php?n=Main.USEKModel
http://www.bbburma.net/Scans/Haynes_WiringDiagram_US_90-96.jpg

Further Discussion of GS500 wiring diagrams
http://gstwins.com/gsboard/index.php?topic=48153.0

[jeremy_nash]

unhook the wire from the switch, and start the bike.  is your light still on?  if it is, you have a wire grounding out somewhere

[Roadstergal]

I changed the pressure sensor out

Check your connections.  When you change something and something immediately doesn't work right, the first suspect is the thing you changed.

[joepua]

unhook the wire from the switch, and start the bike.  is your light still on?  if it is, you have a wire grounding out somewhere

I just tried this, and the light is off. Usually when the key is in the 'on' position, the engine light comes on until I start the bike, which is normal, but with the wire unhooked it never comes on.

I am beginning to think it is oil pressure, but at such low km's? 9400 only.

[joepua]

I changed the pressure sensor out

Check your connections.  When you change something and something immediately doesn't work right, the first suspect is the thing you changed.

I thought the problem was the oil pressure switch, but I switched out the old one with one from the dealer, and the problem still exists.

I just tried jermey's suggestion, but it now seems that the connection is good according to his test.

Ugh, I just can't imagine this bike needing a rebuild @ 9400 kms. It hasnt even been dropped.

And the light only flickers @ ~110 km/h usually. Isn't that when oil pressure is @ it's highest?

[mister]

What oil are you using? How soon after an oil change did the Flickering begin?

Friend had troubles with his Triumph when he went to synthetic oil. Switched back and problem went and stayed gone.

Michael

[black and silver twin]

Whats your idle rpm? It should be 1100-1200. My oil light comes on below 800-900 rpm.

[joepua]

What oil are you using? How soon after an oil change did the Flickering begin?

Friend had troubles with his Triumph when he went to synthetic oil. Switched back and problem went and stayed gone.

Michael

I'm using Motul 5100 Semi-Synthetic 10W40. I was thinking of going to full synthetic, but im not sure if that'll make a difference. From reading the wiki, It doesnt seem like it would help. Anyone know?

It is very wierd, when the motor is cool, the light doesnt flicker until I reach ~110km/h. If the engine starts to get hot the light will flicker sporadically and last week, sitting in grid lock, it stayed on.

[joepua]

Whats your idle rpm? It should be 1100-1200. My oil light comes on below 800-900 rpm.

The idle is set @ 1500RPM. When I idle, it never comes on.

~110km/h, 5500RPM is when it starts to flicker.

[joshr08]

if its flickering at high rpms your oils not returning fast enough to the pan and your getting oil starvation.  I would make sure your oil is returning from the head properly.

[ohgood]

update ?

[bill14224]

Josh is onto it.  Make sure the oil is full.  If it is, do a test.  Drain your oil and replace it with conventional oil.  I bet the problem will go away.  I think your oil pressure light is telling you the semi-synthetic oil isn't flowing properly.  This wouldn't surprise me because your engine wasn't designed with synthetic oil in mind.  Why use expensive oil in a cheap bike?  Try 15W-40 truck oil and watch your problems go away and it will shift like a dream! 

[joepua]

I think switching engine oil will be my next move.

Since Josh mentioned oil starvation is the issue, would 15W40 be the next logical choice ?
Can anyone recommend a reputable brand?...

I think ive changed oil 3 times in the past 3 months lol, using the same oil. Ugh.

[The Buddha]

You could have a clogged galley right next to that switch.
You could also have a bad oil pump or a bad bypass system ... which is on a GS related to that filter hatch and spring etc.
Cool.
Buddha.

[ohgood]

Josh is onto it.  Make sure the oil is full.  If it is, do a test.  Drain your oil and replace it with conventional oil.  I bet the problem will go away.  I think your oil pressure light is telling you the semi-synthetic oil isn't flowing properly.  This wouldn't surprise me because your engine wasn't designed with synthetic oil in mind.  Why use expensive oil in a cheap bike?  Try 15W-40 truck oil and watch your problems go away and it will shift like a dream! 

mmm, don't think so. oil is oil is oil as far as the sending unit cares. so long as there is:

a) enough pressure
b) enough oil
c) electric circuit

the light won't come on. i'd bet on a bad sending unit, a bad electric circuit, or low oil pressure. changing oil is just going to cost you another few bucks and make you scratch your head again.