[Diy_efi] Diagnostic TDC sensor on an old BMW
Tue Apr 11 20:28:14 UTC 2006
Typically, such sensors use to give between a few volts and up to, say,
20 volts p-p, very much depending on the load resistance. By choosing a
suitable load, the p-p voltage can be kept relatively independent of the
engine rpm. It is probably best to connect a scope and do some
measurements with various load resistors connected (probably in the
range 1 kohm - 10 kohm). If it isn't possible to run the engine for the
moment, it might be useful to set up the vibration damper on a lathe,
drill press or distributor test rig, and put the reluctance sensor at
the same distance from the damper as on the engine.
On most german cars with a diagnostic "TDC" sensor, it will not give a
signal at TDC but at 20? BTDC.
Tomas J. Sokorai Sch. wrote:
> Hi guys,
> Any of you know what are the p-p voltages at mid-RPMs of the variable reluctance TDC sensor on the front vibration damper of an old M20 BMW engine (K-jet, M20B23) that's connected only to the dealership diagnostic connector?
> I'm trying to use it for triggering a 3.1/2.8 GM DIS ignition module.
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