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85 Turbo Ignition Fault Testing
Posted by Mike (more from Mike) on Sat, 28 Feb 2004 11:26:23
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Last night on the way home it just up and quit. Sudden failure, backfiring, coasted to a stop. As fate would have it, a SAAB mechanic I know stopped while I was waiting for the tow truck. He suspected either the ignition control unit or the Hall sensor.
I checked today using the Bently manual. No spark at plugs, 12 volts at the Hall sensor, 12 volts between terminals 4 and 2 at the control unit.
When checking the Hall sensor output the book says you should see voltage change from over 6 to under 0.4 between terminals 6 and 3 as you rotate the engine by hand. My voltage stayed constant at 6.5 v.
I take it that means the Hall sensor is gone? Am I sure at this point that the control unit (ignition amplifier) is OK? Thanks.
posted by 216.220.169...
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