mikeb
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| posted on 29/4/09 at 11:27 AM |
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Testing distributor hall effect sensor
Still trying to get my 2.8i ford v6 started.
I now have a brand new duraspark ignition module to test.
Tonight I will make sure all the wires are going to right places,
The one thing I dont know how to test is the hall effect sensor in the dizzy, this has 3 wires, one earth, one send and return to the module. Assume
this generates a pulsed signal to the module, should the send wire to the dizzy be 12v, currently there appears to be no voltage on either of these
wires.
or does the hall effect senor generate a tiny voltage that the amplifier module can read, any thoughts on testing the hall effect sensor greatly
received.
I've read if I short the wire to the hall senor to ground I should get a spark of fthe king lead from the coil, this effectively tests the
module.
http://www.billwrigley.com/et_11.html
detailed wiring diagram for duraspark ignition.
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Mr Whippy
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| posted on 29/4/09 at 11:30 AM |
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its odd as I used this exact same system on the falcon when it had the 2.8 in it and tbh it couldn't have been any easier to get going. Never
bothered testing anything on it, it just worked.
whats the problem your having with it? Personally I'd be scared of putting 12v through the sensor to test is as it is fed from the ignition
module and that might be supplying less than 12v or a tiny current the sensor can handle...just a thought
there's a bit about them on wiki - linky
Automotive ignition and fuel injection -
Commonly used in distributors for ignition timing (and in some types of crank and camshaft position sensors for injection pulse timing, speed sensing,
etc.) the Hall effect sensor is used as a direct replacement for the mechanical breaker points used in earlier automotive applications. Its use as an
ignition timing device in various distributor types is as follows. A stationary permanent magnet and semiconductor Hall effect chip are mounted next
to each other separated by an air gap, forming the Hall effect sensor. A metal rotor consisting of windows and tabs is mounted to a shaft and arranged
so that during shaft rotation, the windows and tabs pass through the air gap between the permanent magnet and semiconductor Hall chip. This
effectively shields and exposes the Hall chip to the permanent magnet's field respective to whether a tab or window is passing though the Hall
sensor. For ignition timing purposes, the metal rotor will have a number of equal-sized tabs and windows matching the number of engine cylinders. This
produces a uniform square wave output since the on/off (shielding and exposure) time is equal. This signal is used by the engine computer or ECU to
control ignition timing. It is worth noting that many automotive Hall effect sensors have a built-in internal NPN transistor with an open collector
and grounded emitter, meaning that rather than a voltage being produced at the Hall sensor signal output wire, the transistor is turned on providing a
circuit to ground though the signal output wire.
[Edited on 29/4/09 by Mr Whippy]
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mikeb
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| posted on 29/4/09 at 11:37 AM |
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No spark is the main issue!
I have a new module, will double check the wiring, any interpretations of how to use my multimeter to check the hall sensor, from what that text says
maybe I shouldn't be expecting a voltage, using my multimeter what should I check?
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02GF74
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| posted on 30/4/09 at 07:26 AM |
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yes, hall effect sensor would produce a small voltage when a magnet is brought close to it.
you should be able to see this on a multimeter, unlike an inductive sensor that wouldproduce a short low voltage pulse.
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