sawsalot Posted November 16, 2010 Share Posted November 16, 2010 Was at independent shop. When I got it thePCM was blank. Get CMPfault after 5-10 sec crank. Scope reading looks good. Has an overlay cmp harness new cmp and pcm. Fse was here no help. Any ideas? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 17, 2010 Share Posted November 17, 2010 I've got more answers than questions because you didn't give us much info to start with. What are you comparing your scope waveforms to? Is the CMP wired backwards- that has happened before. Does the initial waveform movement go upwards on the positive pin? (indicating correct polarity) I'm assuming you flashed the PCM? Is there rust under the CMP sensor? Extended cranking can cause false CKP/CMP codes on nearly any Powerstroke, it's possible you are chasing the wrong problem. Does "Sync" and FICM Sync" change from no to yes? (I suggest changing it to a bar graph, usually FICM Sync changes just before Sync) If your Sync and FICM Sync change to yes, look at fuel pressure and ICP voltage, which should be .17v-.24v and quickly go to 1.5v+ cranking. What's your cranking RPM? A 6.0 should crank no slower than 175rpm cold. Does your waveform look like this? (pins 30 and 31) My biggest question is why was the FSE no help? Quote Link to comment Share on other sites More sharing options...
sawsalot Posted November 17, 2010 Author Share Posted November 17, 2010 to answer your biggest question this fse had never worked on a 6.0 liter. yes mypattern looks like yours the block has been sanded. I never have sync or ficmsync. all i get is cmpfault yes after 5-10 sec crank. what triggers cmpfault? Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 17, 2010 Share Posted November 17, 2010 I never have sync or ficmsync. I'd change both sensors and overlay both harnesses, both pigtails are available from FMC (they're different). Maybe the indy shop used aftermarket sensors. Double check battery strength, cranking speed, powers and grounds to the PCM, etc. Quote Link to comment Share on other sites More sharing options...
sawsalot Posted November 17, 2010 Author Share Posted November 17, 2010 Thanks for the help. Sounds like the owner is going to take it home. Will keep you guys posted Quote Link to comment Share on other sites More sharing options...
ktmlew Posted November 18, 2010 Share Posted November 18, 2010 How do you get to FSE level if you've never worked on a vehicle that is still currently under warrenty coverage? Seems strange to me... Quote Link to comment Share on other sites More sharing options...
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