Abs Sensor

[Trucker]

Can anybody help plz. I'm afraid its the same old thing again. My sensor light is staying on all the time and as i don't have a vag com for testing I'm running out of alternatives. does any body know what i have to set my voltage meter to to test the sensor. Ive done what i thought was the right way on all 4 but all 4 are showing up as a broken circuit.

If anybody can help I'm in the Newbury. Berkshire area. I would be really grateful. ^_^

[Chris Young]

Where did you test the sensors? did you unplug it from under the car and test it like that?

Sure open circuit means faulty sensor.

Checked the fuse?

I have just replaced one of my sensors using vag com to check which one was faulty.

Took me ages to get the faulty sensor out. But the new one did the trick.

[Trucker]

Where did you test the sensors? did you unplug it from under the car and test it like that?

Sure open circuit means faulty sensor.

Checked the fuse?

I have just replaced one of my sensors using vag com to check which one was faulty.

Took me ages to get the faulty sensor out. But the new one did the trick.

[Chris Young]

Are you using a multi meter or just a circuit tester. the speed sensor will have a resistance in it so might not set off a buzzer. have a look at the resistance level on a multi meter and look for the odd one out.

I really would recomend OBD2 reader or Vag Com, will save you a load of time.

[Trucker]

Are you using a multi meter or just a circuit tester. the speed sensor will have a resistance in it so might not set off a buzzer. have a look at the resistance level on a multi meter and look for the odd one out.

I really would recomend OBD2 reader or Vag Com, will save you a load of time.

Thanks for that but whats an OBD2 reader. Sorry if i sound a bit thick.lol

My multi meter has

An up side horse shoe which i assume is ohms 200, 2k, 20k, 200k, 2m, 20m, 200m.

DCA

DCV

ACA

ACV

And a Music note symbol. which is what i have been trying to use

is that any help.

cheers

Edited June 5, 2007 by Trucker

[Vince]

Trucker,

 

If you want to bring your car to Charvil (just to the east of Reading), I can plug Vag Com in and check your errors for you.

Drop me a PM and we can exchange details if this is still causing you problems.

 

Vince.

[Smilge]

Where did you test the sensors? did you unplug it from under the car and test it like that?

Sure open circuit means faulty sensor.

Checked the fuse?

I have just replaced one of my sensors using vag com to check which one was faulty.

Took me ages to get the faulty sensor out. But the new one did the trick.

[turk90210]

Hi Trucker

you can check your sensors with your multimeter using 2 scales only but as someone has mentioned you either need to know the spec values or test along side a known good sensor, you can use the resistace - ohms-upsidedown horseshoe (whatever you want to call it) scale, starting on the highest scale then working down until you get a reading, and also the AC voltage scale (with the sensor unplugged) but here lies the problem,you probe onto the connectors and spin the wheel which should give you a rising AC voltage ,but you need to spin at a set rpm on both new and old sensors to get an accurate reading. (basically an inductive sensor has a magnetic field at the tip where it meets the castle-ated collar as the castle's pass through the magnetic field they break the field which produces AC volts, depending on how fast they pass depends on how much /many volts it produces)

 

Without wanting to contradict anyone on their good advice as it may well work but

The music symbol is for continuity and is usually on 1 scale only on the ohms (I use 2 meters 1 has it on the 100 range,the other on the 200 range) so any resistance below this range and you will get the tone, anything above and it will just show as a resistance value

 

The diode check is usually a arrow head facing the top of a T and is used for just that, checking diodes, but no doubt people have found other uses for it

 

The multimeter is a great diagnostic tool but its understanding what the readings mean and what you would expect from the things that you are checking where the problems lie

 

Getting back to the original problem of the abs sensor it would be alot easier to get someone to scan it for you as you can see from above

 

hope this helps

[Smilge]

Yep .... would agree with that Turk ..... I've used an oscilloscope on a crankcase sensor .... I assume you could do the same with the ABS sensor?

[Trucker]

Trucker,

 

If you want to bring your car to Charvil (just to the east of Reading), I can plug Vag Com in and check your errors for you.

Drop me a PM and we can exchange details if this is still causing you problems.

 

Vince.

Thanks ever so much for that Vince, i would be really greatful if can take you up on your offer. What sort of times are best for you.

I work nights but im up by about 9 most mornings.

Danny

[Trucker]

Yep .... would agree with that Turk ..... I've used an oscilloscope on a crankcase sensor .... I assume you could do the same with the ABS sensor?

Thanks for all your help folks.

What would people do without this site. lol

Danny