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Old 11-03-2003, 10:21 AM
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Join Date: Aug 2001
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Question Hall effect sensor diagnosis

What symptoms does a bad sensor have? Can it affect normal driving above 1.4Khr?
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Old 11-03-2003, 05:02 PM
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Re: Hall effect sensor diagnosis

Originally posted by Cap'n Carageous
[B Can it affect normal driving above 1.4Khr? [/B]
1.4 thousand hour? wuzt this?
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Old 11-03-2003, 07:46 PM
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Join Date: Jan 2002
Posts: 18,353
I've installed a couple of Pertronix hall effect electronic ignitions on older point systems. I am under (the possibly mistaken impression) that when they fail, it is complete failure and the vehicle won't run. I would like clarification on failure modes if I am wrong.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 11-03-2003, 08:55 PM
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Join Date: Mar 2003
Location: Milwaukee Wisconsin
Posts: 1,149
A Hall effect device is just a solid state switch. It is essentially a transistor which conducts (On) in the presence of a strong magnetic field. So, like any silicon device, it generally fails completely, if it fails at all. But, intermittent operation might occur is the magnetic field is marginally not strong enough to completely saturate the switch. The field strength is controlled by the distance between the magnet and the switch. So, if possible, move the device and the magnet closer together. Tod
Resistance is Futile.
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Old 11-04-2003, 04:12 AM
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Join Date: Feb 2002
Location: Belgium,Europ
Posts: 196
Cap'n Carageous,

What car are we talking about ?
On my 1990 W124 TD turbo the Hall sensor serves only to transmit the speed of the car ( read on top of the speedocable right behind the instrument cluster ) to the Tempomat cruise control. So if your Tempomat is not working know where to start !
Depending of the age of the car, the outboard temperature reading is also coupled to the Hall sensor so it will not indicate a wrong temp when you are not driving .
If you don't have one ore both of these items there will be no Hall sensor because ther is no need of it !

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