Quote:
Originally Posted by 911hillclimber
Yes, that trace was on the engine, 10 thou gap, normal cranking speed.
Scope was on the connector at the end of the sensor lead.
We also tried the same with the polarity reversed, no difference.
The wave form got rougher at 48 thou but generally same shape, less pk to pk volts.
Clewett said engine would not run at 10 thou, 40 is best.
The pulley wheel toothed wheel came from Clewett as part of the kit, 127mm dia., 60-2
I think the XDi is grounded by the large ground wire coming out of the unit, but we did ground the outer heat sinking case to chassis.
Made no difference.
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Sounds like you have a good ground so that won't be an issue.
Try doing the same oscilloscope test that you did, but with the sensor harness plugged into the main harness. This would help you eliminate the possibility that there is a fault in the main harness that connects to the XDi box.
Repeating the test that way would tell you if you have a crank signal getting to the connector on the XDi box.
IIRC, the 23pin connector is a snap together design to allow for the addition of an extra coil pack harness. I had to open up my harness when adding the extra coil pack harness when I went from single plug to dual plug.
I really think the problem is in the main harness connecting your known good sensor and the tested Ignition controller.
The XDi is not a very sophisticated piece of electronics and I would have no reason to not believe that it bench tested OK at Electromotive. I wouldn't bother even pugging in the coils at this point, as the issue is 100% the crank signal.