first off, check that the crank sensor is gapped properly.
it shuld be between 0.6 and 1mm away from the lugs on the
crank pulley. (set mine at 0.75mm i think)

ALSO check that there are still 4 lugs on the crank pulley.

The plug for this sensor is just behind the distributor,
check the connection there.

you can get a new TDC/crank sensor for about £25 mate

not 100% sure on how to test if its fooked or not though.
(not sure that testing voltage across the terminals while turning the engine over is a good idea? might it fook the ECU?)