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Old 03-26-2013, 03:08 PM
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2000 F250 4x4 No Start

Truck stuttered a couple times, then stalled. Restarted twice and then quit. Stored codes for CMP sensor and EBP sensor. Replaced both only to cure the EBP code, still P0340 code and still no start. Replaced CMP sensor again with no change. Visually inspected wiring from sensor to engine connector, I do have 5.0vref at sensor. With Modis hooked up there is no RPM reading during cranking. Any ideas? BTW, truck has 266,000 miles on it and until this problem ran flawlessly. Also it is bone stock, auto trans. Thanks in advance for any help.
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Old 03-27-2013, 03:34 PM
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Alright, figured it out today, kinda by accident. Anyone want to guess what it was? Hint: No parts needed replacing.
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Old 03-27-2013, 04:30 PM
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Fuse? loose connector?
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Old 03-30-2013, 12:25 PM
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What was the problem. I have changed the cam sensor with 4 diffrent ones since you can buy them brand new and not working.
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Old 03-30-2013, 03:57 PM
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I finally suspected the PCM and upon removing it to get the part number I noticed some corrosion on the lower edge of the case (side closest to the floor when installed). Decided to take the covers off to see how far the moisture got. After removing the aluminum cover I found corrosion on the ends of the connector pins where they are soldered to the board. I can only describe it as tiny pieces of cauliflower or cotton looking balls on the ends of the pins. Typical of aluminum corrosion, the 'balls' were large enough to bridge across 2 or 3 pins each, and upon touching them, I noticed they were damp. Sprayed the area with electronic cleaner, blew it off with air, a light coating of silicone spray, and reassembled. Re-installed the PCM and tested, engine lit right up and has not missed a beat since. I figure the moisture was enough to mask the signal of the cam sensor, and generate the code. I hope this helps someone else out there.
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Old 03-30-2013, 04:00 PM
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I'm glad you found it and were of the mind to look deeper and fix it yourself. You should keep and eye out for what caused the moisture to get in there, as that's not exactly normal.
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Old 03-30-2013, 04:02 PM
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I'd suspect your windshield is leaking in the lower corners (they often do) and dripping onto the GEM & PCM. Have a look, if it needs to be fixed, do it or it's gonna happen again
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Old 03-30-2013, 04:05 PM
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Ah, I thought the water only got to the GEM that way.
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Old 03-30-2013, 04:24 PM
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Oh no, the GEM is just "First-in-Line" with the PCM below it
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Old 03-31-2013, 04:52 AM
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I know what caused it because I saw the condition of the floormats. It's a company owned plow truck, the only care or cleaning it gets is when it comes to me with a problem. Snow and salt accumulate on the floormat and then the heater cooks it, it evaporates, and attacks.
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