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Power Strokes
7.3 Tech
7.3 ICP Wiring Issues
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[QUOTE="Marty, post: 1142806, member: 602"] I tied all the grounds on a separate PCM together and the 12v powers and put them on the battery. Then I pulled the two wires out that go to the ICP sensor. The Sensor ground and the sensor 5v signal. When doing that.... the truck does not mess up. This leads me to believe that the signal return that is screwing up, is doing so as a result of noise being introduced into it from one of the other two wires. I then tied in the sensor ground from the sensor and tied it in to the sensor ground closer to the PCM with a new wire and it fixes this problem as well. Trying to find out where the noise is coming from now. As of right now the truck idles without oscillation when hooked up that way. Re-hook it back up normal and it oscillates again. For what it's worth, that signal return, when on the scope is only slightly screwing up when the reading is being taken from the fender by the PCM. The closer you get to the ICP sensor itself the higher the fluctuation. This leads me to believe the problem is probably somewhere near or after the 42 pin connector. [/QUOTE]
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