Crank Sensor causes 9v olts to drop to 3.5

[AAFA]

When I check 9v to sensors off pin 44 when nothing plugged in 9 volts at crank,cam,speed sensor connectors. Yellow wire.
Hook up Cam sensor still have 9 V,
Hook up crank sensor it drops to 3.2.. replace with new one still the same drop.
disconnect cam sensor voltage still only 3.2.
Speed sensor still disconnected..

Any body seen this?

ECU was bad current limter for pinn 44 blown.
Replaced ECu started right up

 

[luv2rallye]

This sounds like a very strange and difficult one. I've been looking at the diagrams to come up with a possible senerio. I know this is a long shot but that may be what you need right now.

The only thing I can think of is the crank sensor is the only one of those 3 sensors that has 2 wires both going to the same connector [33 pin connector A-83 which is J/C(4)]. Within this connector the diagrams show pin 23 and 24 are connected together. Pin 23 is the blue/white wire that goes to crank sensor pin 3. Pin 24 is the blue/white wire that goes to PCM pin 32. Pin 10 is the yellow wire that goes to crank sensor pin 1. Now if the wire on either pin 23 or 24 is shorted to the wire on pin 10, I could see a possibility that the voltage could be pulled down only when the crank sensor is connected (thru it's internal output transistor). The other sensors wouldn't be affected without the crank sensor connected since even with that short, that pin 24 is still pulled high within the PCM through an internal divider network. So it would need the crank sensor connected to pull it low.

There is also another 10 pin connector A-06 between the crank sensor and A-83. If it's pin 1 wire (blue/white) is shorted to it's pin 3 wire (yellow), the same exact senerio as above could occur. I would check this one first as it's probably the more likely possibility considering it's location.

Good luck with this one!