no spark at crank sensor but juice at the green wire at coilpack on 2000 Mazda MPV

I have spark at the green wire at the coil pack but no spark at the crank sensor; which means I don't have spark at the plugs.

What is the procedure for checking out this problem? PLease!

I just put the engine back together from a blown head. Now I have no spark at the plugs. The chains are on correctly.

Asked by for the 2000 Mazda MPV
scan codes and post so we can adv
thank you for your imput; But:

I bought a scanner and hooked it up only to have it burn up. I could not get a signal, so I unplugged it. I put iit in my pocket and about 10 minutes laterheard a shril sound ( a high pitched noise, like there was an air leqak or a pressure leak). When I finally realized it was coming from the meter, I tried to shut it off, to no avail. I had to remove the batteries to get it to shut down. I replaced the batteries and it would not turn on.I put new batteries in it and it still would not turn on. I cannot scan! can you call me at 904 641 6097 and talk to me?
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check to make sure you hooked everything up after head gasket replaced
thank you for your imput.

I have been through the engine over and over. I took the front of the engine back apart twice to see if the 2chains were on correctly, they were. Thinking that a miss communication from the crank sensor and the cam sensor had occurred.

What is the procedure for checking the electrical from the coil to the crank / cam sensors? I am about crazy with this thing. If you have the answer please give it to me. Thank you, Richard.
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