testing distributor mounted hall effect sensor ... - Saab 900 Bulletin Board - Saabnet.com
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testing distributor mounted hall effect sensor ...
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Posted by walt [Email] (#2707) [Profile/Gallery] (more from walt) on Sun, 25 Jul 2010 19:03:43 Share Post by Email
In Reply to: How often do hall sensors fail? or just bad wires?, JLitten007 [Profile/Gallery] , Sun, 25 Jul 2010 16:20:46
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Remove the distributor from the cylinder head after marking it so you can reinstall with same timing. Remove wire harness from hall connector on distributor. Remove distributor cap center high voltage wire from cap and ground this to avoid shocking oneself or damaging ignition control unit. Peel boot back from hall sensor harness so you can put a test wire on the center wire which is marked "0" on distributor connector. Connect test wire to digital voltmeter and ground common plug on voltmeter. Reconnect harness to distributor hall connector. Turn on ignition but don't start. Turn distributor by hand. You should hear fuel pump run intermittently and injectors click. This method also is handy if one wants to visualize injector spray pattern after pulling injectors from intake manifold. Voltmeter should show from about 0.4 to 3 volts as shutter wheel moves through hall sensor. To disassemble distributor, easiest method for me is to remove drive cog from distributor shaft that mates with camshaft then pull entire shaft with shutter wheel still attached out through the distributor body. You do need to mark drive cog so that you don't reassemble 180 degrees from where it should be. Inexpensive hall sensor/magnet assemblies are available from electronics supply outfits like DigiKey or Mouser if one is handy soldering. Heat is what usually kills hall effect sensors.

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