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2011 ram 1500 p0344 intermittent Cam signal

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1 week 1 day ago #92698 by WillN
Need some direction, just took my first waveforms! 2011 ram 4.7l 1500 p0344 intermittent Cam signal. I took a scope of the crank and cam on my pico 2204a and not sure what I'm exactly looking at. I have 5v ref on both when checking harness unplugged but neither seem to pull fully to it.  Both the cam and crank seem to have this issue on the waveforms. I'm leaning towards two sensors, is this correct in my thinking?
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6 days 22 hours ago #92710 by Noah
Well that looks interesting, are these cranking or running patterns? Can you also probe the 5v ref and signal return to the sensors at the same time to verify it remains steady?
Cam and crank sensors were problematic for that engine, aftermarket ones could be unreliable though I doubt you would easily be able to find OEM at this point.

"Ground cannot be checked with a 10mm socket"

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6 days 9 hours ago - 6 days 9 hours ago #92718 by Tyler
It looks to me like the CMP and CKP signal wires are resistively shorted to each other. 

I've seen this once before. The ECT sensor likes to leak coolant into the connector, which wicks up the ECT wires and into the PCM connector. It just so happens that the ECT, CKP and CMP all share the same PCM connector (C2).
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5 days 23 hours ago #92719 by Noah
Ooh, that would be cool! I have seen that on Chevy's, not a Chrysler yet

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1 day 11 hours ago #92734 by WillN
You hit the nail on the head. I scoped the 5v ref during signal and it was dropping up to .7v
Ect had wicked all the way up had corrosion on cam/crank signal pins as well as a 5v ref pin.
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1 day 8 hours ago #92737 by Tyler

You hit the nail on the head. I scoped the 5v ref during signal and it was dropping up to .7v
Ect had wicked all the way up had corrosion on cam/crank signal pins as well as a 5v ref pin.

How severe was the corrosion? Is this your truck or a customer?

Correctly, it needs a PCM and C2 connector, ECT and connector and two overlaid wires. In reality, you might get by with replacing the ECT and drying out the connectors.

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1 day 8 hours ago #92740 by WillN
Customer truck, the corrosion on c2 wasn't bad neither were the PCM pins. However the ect connector was falling apart. One of the pins inside were corroded and the wire had discolored. New ect/ect connector and cleaning out c2 resolved the issue. Now if he would of asked me to look at it before a shop got him for coils, plugs and a cam sensor would have been better 😆

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