Question about 2004 Ford Escape
P0351 indicates either a damaged PCM, a damaged coil, or a open or shorted circuit. Being that you already replaced the PCM I would assume its not that unless you were very unlucky and bought a damaged one. If its a open or shorted circuit it will be a little harder to find. You can try and do a visual inspection of the wires but you won't be able to see much being that most of them are wrapped in bundles. If you had a multimeter, wiring diagrams, and knew what voltages/watts/ohms ran threw each wire you could try and trace an open or shorted circuit but without I don't think you'd have much luck. Odds are that it is a damaged coil(P0351 indicates Cylinder #1 I believe). They handle large amounts of current that over time may cause damage and cause them to fail. It is much more common for a coil to fail than a PCM failing or there being a damaged circuit. But being that you have to remove the upper intake to get at them there is no real easy way to test them. The only other thing I can find only applies if you live near salt water. Its possible that salt water has gotten into the CKP(Crankshaft Position) sensor harness. You have to thoroughly clean the harness and apply di-electric grease and if that doesn't work replace the CKP sensor itself.
Posted on Mar 24, 2011
Testimonial: "This problem is intermittent. I did find out that the 1st PCM was giving me a P0301 error and the 2nd gives me a P0351. I can't find the difference."
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Posted on Jan 02, 2017
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