Thanks for the reply.what do I do if I can't lay my hands on a o'scope? Any other options?
The CKP sensor has a B+ power supply, a ground, and a signal circuit.
As the crankshaft rotates, the wheel teeth interrupt a magnetic field produced by a magnet within the sensor. The sensor's internal circuitry detects this and produces a signal which the ECM reads. The ECM uses this signal to accurately measure crankshaft velocity which is a variable used in order to detect misfire, spark and, fueling.
Looking at your service manual find the wire that goes to the B+ Measure from this wire to ground for the DC supply voltage. Measurement should be taken on the sensor side of the connector. Ground connection as well.
On my Dyna this wire is marked BK for Black. Do this test at rest and with the engine spinning. A loose connection could break as the motor shakes.
If you have voltage present with the key on and with the engine spinning move the positive meter lead to the Signal wire. This is marked R for Red on my Dyna. With the engine spinning you should see a voltage signal on that wire.
You should measure the signal at the sensor connector and the ecm to verify it is reaching the brain.