MakeEverything
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| posted on 25/10/10 at 10:08 PM |
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VR Sensor needed - Herts
Hi There,
I think i have narrowed the fault down to the VR sensor which i want to try and replace with a proven unit if poss.
I am off work this week (half term) so really only have this week to break the back of the work still needed to be done.
Does anyone local have one i can borrow please?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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ChrisW
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| posted on 25/10/10 at 10:17 PM |
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What engine? I have a zetec one.
Chris
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MakeEverything
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| posted on 25/10/10 at 10:19 PM |
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Im using a ford one like This and the bracket is made for this, so would like to keep
the same if poss. Really, i just want to verify if mine is nackered before spending £20 on a new one.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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matt_gsxr
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| posted on 25/10/10 at 11:00 PM |
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Have you measured its resistance yet?
The design of a VR sensor is pretty simple, so if it is magnetic, and is not open circuit and not shorted then it is probably fine.
Have you 'scoped the output? Voltage should be a few hundred mV (mine is around 250mV at cranking, and much more with engine running, area
under the voltage time curve is constant-ish so as the engien goes faster the pulses get shorter the peak gets higher).
Its just a coil of wire around something that gets more or less magnetized as far as I can tell. Their normal mode of failure is when the crank wheel
piles into them. Which is a pretty easily identified fault mode!
I only have motorcycle sensors.
Matt
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MakeEverything
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| posted on 26/10/10 at 07:57 AM |
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quote:
Originally posted by matt_gsxr
Have you measured its resistance yet?
The design of a VR sensor is pretty simple, so if it is magnetic, and is not open circuit and not shorted then it is probably fine.
Have you 'scoped the output? Voltage should be a few hundred mV (mine is around 250mV at cranking, and much more with engine running, area
under the voltage time curve is constant-ish so as the engien goes faster the pulses get shorter the peak gets higher).
Its just a coil of wire around something that gets more or less magnetized as far as I can tell. Their normal mode of failure is when the crank wheel
piles into them. Which is a pretty easily identified fault mode!
I only have motorcycle sensors.
Matt
Thanks Matt,
I know what the sensor is, but mine isnt easy to test in situ, given that it is against the bulkhead and between the water pump belt etc. I would
have to lean over the engine and through the belts to test it whilst cranking. Im not doing that!
It doesnt appear to be damaged by the trigger wheel, but i dont have an oscilliscope to test it either.
All these reasons are why i want to swap it with a known good unit rather than mess about, but thanks for the reply.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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