abs sensor.front/rear.is there a difference?

[skik]

still cant get my abs light from flashing.ive changed the rear sensor so looking a front one.a guy on ebay has an abs sensor but cant remember if its front or rear.he says they should be the same but i dont think so.anyone know?

[hein]

  Even though the part numbers are different for the front and rear sensor the actual sensors could be the same. The difference might be in the lenght of the two wire harness that is part of the sensors. Since you have a spare rear sensor pull out the front sensor and compare the two. The colour code for both are the same and the holes in the backing plates where they mount are the same so possibly all you would have to do would be to lengthen the harness to swap a rear for a front.
  Before you buy another sensor check your brake light switches. A faulty brake light switch can also cause the abs indicator light to flash. Both switches are a three wire type and are wired into the abs ecu meaning a problem with either switch could trigger a problem code causing the light to flash.

Hein.

[skik]

  Even though the part numbers are different for the front and rear sensor the actual sensors could be the same. The difference might be in the lenght of the two wire harness that is part of the sensors. Since you have a spare rear sensor pull out the front sensor and compare the two. The colour code for both are the same and the holes in the backing plates where they mount are the same so possibly all you would have to do would be to lengthen the harness to swap a rear for a front.
  Before you buy another sensor check your brake light switches. A faulty brake light switch can also cause the abs indicator light to flash. Both switches are a three wire type and are wired into the abs ecu meaning a problem with either switch could trigger a problem code causing the light to flash.

Hein.

thanks for the reply hein.was told about the brake switches before.both are working the light ok.not sure how to check anything else.i dumped the old sensor as i broke it trying to get it off.i does seem like just different harness lenghts.changing the sensor is a shot in the dark.not too confident it will solve the flashing light.its doing my head in.its all the bike needs to get through m.o.t

[hein]

Hi Skik.

  I suspect your reference to MOT means you live in the UK. I'm not familiar with the rules nor the test procedures that apply to you so I've a few quetions.
Have you done a resistance test on the two sensors?
Do you have a service manual with a wiring schematic?
Even though you have a flashing light issue does your ABS still function?
Is your goal to have a working ABS system or do you just want to pass the MOT inspection?
Will they roadtest the bike and test the actual operation of the brakes or is it just visual?

  If working ABS is not an issue for you and an actual roadtest is not performed then all you need is the appearance of a working ABS system with an indicator light that is on during startup and goes off when running. If this is the case let me know and I can probably help you out.

  You will need a wiring diagram and be comfortable with some "creative" wiring.

Hein.

[skik]

Hi Skik.

  I suspect your reference to MOT means you live in the UK. I'm not familiar with the rules nor the test procedures that apply to you so I've a few quetions.
Have you done a resistance test on the two sensors?
Do you have a service manual with a wiring schematic?
Even though you have a flashing light issue does your ABS still function?
Is your goal to have a working ABS system or do you just want to pass the MOT inspection?
Will they roadtest the bike and test the actual operation of the brakes or is it just visual?

  If working ABS is not an issue for you and an actual roadtest is not performed then all you need is the appearance of a working ABS system with an indicator light that is on during startup and goes off when running. If this is the case let me know and I can probably help you out.

  You will need a wiring diagram and be comfortable with some "creative" wiring.

Hein.

hi hein.ive not done a resistance test.electrics not my thing.i can strip an engine but show me a wiring diagram and im lost.i do have a multimeter so if its not to difficult i will give it a go.
i have an online black and white manual [not great].
i done the self test of abs [crossed wires.both levers decreased and pumped up again]so i take it the abs is working ok.
just need it to pass mot.
just visual test.
anything to fool the inspector would be great

[hein]

Hi again Skik.

  Resistance test is easy, mutimeter set on resitance, disconnect the wiring plug for each sensor and measure across the two terminals from the sensor. Should be 1,190_2,210 ohms at 20deg C. room temp approx.

  To hopefully fool the inspector you need an alternate temporary power source. If you use the trigger lead that goes to your starter relay you might pull this off. There are two wires that go to your ABS light, a brown and red goes goes to power at your fuse panel, disconnect this, a white and red goes to your ABS ecu, disconnect this also. Splice into the blue and white wire that comes from the starter swich to the starter relay and connect this to the either of the indicator light wires that are now free. Hook the other wire from the light to ground.

  Although the light will not come on with just the ignition switch it should come one when the starter switch is used and go off when you release the starter switch and the engine is running. This might be enough to convince the inspector that the system is working.

  If he questions why the light fails to come on with only the ignition switch tell him that its always worked this way. Depending on your comfort level with utter bullshit regale him with the story of how you once had the abs light come on while riding. The light came on, you took it into a Yamaha dealer where they hooked up to their diagnotic machine, they found a faulty sensor, replaced it retested the system and roadtested the bike and gave it a clean bill of health. Divert his attention from the light and tell him of the wonderful pub you discovered after this all happened .

Hein.