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Fuel reserve light refuses to go off

V

vfr

Husqvarna
C Class
I have quite the opposite of the common problem reported on the fuel reserve light.

The fuel reserve light on my 2008 SM510R refuses to go off even after the engine has started with a full tank of gas.

Does anyone have a clue why this is so? Will the erroneous detection of gas level affect the ECU reading?

Appreciate any information. Thanks!
 
it's pretty tricky actually. there is a resistor that sits inside the wiring harness above the left radiator above the clip that holds the harness to the frame. apparently that resistor's legs tend to break and then the fuel light goes on permanently.
to be sure, before you take the harness apart, disconnect the fuel pump connector and turn the switch on.
if the light is still on, the problem is the resistor.
if you replace the resistor make sure you get the right voltage and exact resistance, you can also put it inside a silicone shrink.
good luck.
 
mototomer said:
it's pretty tricky actually. there is a resistor that sits inside the wiring harness above the left radiator above the clip that holds the harness to the frame. apparently that resistor's legs tend to break and then the fuel light goes on permanently.
to be sure, before you take the harness apart, disconnect the fuel pump connector and turn the switch on.
if the light is still on, the problem is the resistor.
if you replace the resistor make sure you get the right voltage and exact resistance, you can also put it inside a silicone shrink.
good luck.
Click to expand...
I just started having this problem with my 2009 TE. Does anyone know if it also uses this resistor? When my fuel pump assembly is disconnected, turning on the key still results in my low fuel light coming on.

I checked that the fuel pump hasn't slipped (I had previously secured it) and that both wires are still attached to the sensor, as well as checking that they have continuity to the pump assembly plug.

Actually, I think I just answered my own question. I just looked at the wiring diagram in the owner's manual PDF and it shows a 110 ohm resistor with one leg on the line from the sensor.

Guess I'll have to have a look at the harness.
 
Yeah, mine was a leg broken off the resistor, too. Always meant to thank mototomer for his post here. I think it would've taken ages to find without that, so thanks, mototomer!

It sucked having to cut open so much of the wiring harness. Too bad they couldn't come up with a better system.
 
I soldered mine. It was a pain, but I don't trust crimping. If I recall correctly, it was a crimp type connector from the factory.
 
I didn't feel like slicing up the wiring harness looking for the resistor, so I just unplugged the sensor wire at the connector where it leaves the petcock on the right side of the tank. I check fuel level old style now...take of the cap and slosh it around. Do you really need a fuel gauge on a dirt bike?
 
Mike-AK said:
I didn't feel like slicing up the wiring harness looking for the resistor, so I just unplugged the sensor wire at the connector where it leaves the petcock on the right side of the tank. I check fuel level old style now...take of the cap and slosh it around. Do you really need a fuel gauge on a dirt bike?
Click to expand...
My petcock was the problem on the '13 and part was an '11,'12 petcock/sensor for $45. Alot easier to remedy than slicing the harness on older models.

http://www.cafehusky.com/threads/reserve-fuel-sensor.36762/#post-357981
 
Mike-AK said:
I didn't feel like slicing up the wiring harness looking for the resistor, so I just unplugged the sensor wire at the connector where it leaves the petcock on the right side of the tank. I check fuel level old style now...take of the cap and slosh it around. Do you really need a fuel gauge on a dirt bike?
Click to expand...

THERE IS MY FRIEND. WHY NOT WORKS RIGHT?
 
FOTOS
 

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Kyle Tarry said:
Post up the wiring diagram. If we can see the circuit we might be able to figure out what that resistor does.
Click to expand...

This is for the '09 models. I've highlighted the wires on either side of the resistor (center of the diagram). Looks like one leg goes to common, the other leg goes to the wire that runs from the fuel pump (sensor) to the dash.
 

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Based on that, I think if you directly connected that wire, without the resistor, the current would always flow to ground (path of least resistance), likely meaning the light will always be off.
 
A little bit hard to see what that Br (brown) wire that the resistor goes to is doing. I think gnd is a good theory, but I can't find anything that would show for sure what the darn thing is. The other side of the fuel level sensor (B), is that +12V? Looks like it, based on some of the other stuff it goes to...

Does another page in the manual show the fuel level sensor output? Is it variable resistance?

It looks like they are doing something with variable voltage out, but it's hard to see why there is that leg to common.

I don't think that replacing the resistor with a short will work.
 
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