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?
What engine? I have a zetec one.
Chris
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.
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
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