EEC-IV Issues, Fried??
#1
EEC-IV Issues, Fried??
So I've had a dtc 452 for awhile I e been tracking doqn, thanks to subford and a couple others I successfully figured out that pins 3 and 6 were simply nor making a strong connection at the pcm. I get it working great and man was I happy after months of pulling my hair out she shifts perfectly.....but then... I go out one morning and she is right back to limp mode. I'm cussing a pissin mad... I check and double check and triple check the connection, and it's good.
So I open up the pcm to take a look and trace pin 3 and 6 to this chip. I'm gun shy about replacing it so I want confirmation from you wonderful ford peeps that this is burnt. Thank you!
Its on the left side you can see the burnt looking spots
So I open up the pcm to take a look and trace pin 3 and 6 to this chip. I'm gun shy about replacing it so I want confirmation from you wonderful ford peeps that this is burnt. Thank you!
Its on the left side you can see the burnt looking spots
#2
Join Date: Jun 2006
Location: Ottawa, Ontario
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Nothing there looks burnt to me, that's from the perspective of an electronics technologist with almost 20yrs experience troubleshooting electronic circuit boards. The brown spots are just solder flux residue which is probably hard and crispy and would scrape off if you were to try and clean it but that isn't necessary.
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470,000 ohms of resistance to what? Also, I would not have cleaned or touched that. That is a ceramic-hybrid module, and those black "burnt" bits, are actually laser-trimmed carbon resistors. Touching them may have altered their values.
You should be checking continuity between the backside of Pins 3 and 6 (as in, from inside the computer) to the same connections up at the PSOM.
You should be checking continuity between the backside of Pins 3 and 6 (as in, from inside the computer) to the same connections up at the PSOM.
#7
470,000 ohms of resistance to what? Also, I would not have cleaned or touched that. That is a ceramic-hybrid module, and those black "burnt" bits, are actually laser-trimmed carbon resistors. Touching them may have altered their values.
You should be checking continuity between the backside of Pins 3 and 6 (as in, from inside the computer) to the same connections up at the PSOM.
You should be checking continuity between the backside of Pins 3 and 6 (as in, from inside the computer) to the same connections up at the PSOM.
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#12
Keep in mind PSOM failure is pretty common with these trucks. If you know someone with an OBS truck, see if you can convince them to let you borrow their cluster.
#13