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Author Topic: Help with chipping P75 ECU.  (Read 6258 times)

hamburgler

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Help with chipping P75 ECU.
« on: June 20, 2009, 06:06:37 PM »
Im no newbie to chipping.  Ive done lots before but never a P75.  I have just finished chipping one.  The car starts with a solid CEL and only revs to 3000rpm.  Time to trouble shoot.

So basically there is no R54 to solder in a resistor and R52 is blank from the factory.

C51 and C52 will get will get the yellow capacitor (0.1uF) #104, J1 will be jumped, J12 cut, CN2 (pins 1-4) will get the logging header).  Whats up with pin R52 on the P75 ECU?  Just leave it blank?
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d112crzy

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Re: Help with chipping P75 ECU.
« Reply #1 on: June 20, 2009, 09:57:29 PM »
DId you test the ecu before you chipped it? Cut j1 to confirm it's not a bad ecu to begin with.
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Joseph Davis

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Re: Help with chipping P75 ECU.
« Reply #2 on: June 21, 2009, 12:20:50 AM »
Poorly flowed solder joints cause that problem.  Poorly flowed joints also cause CEL with J1 cut.  Happens to all of us, I murdered one last week trying to replace an old school RTP board with a socket.  Try to reflow and see if that works.
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hamburgler

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Re: Help with chipping P75 ECU.
« Reply #3 on: June 21, 2009, 01:21:15 AM »
Ya its tested.  I cut J1 and its all good.  I then re soldered it in for the external ROM.

Whats also messed up is that I forgot to put a chip in the socket, primed it, solid CEL, and started the car and it ran good.  Ya so I dunno.  J1 is definitely good though.  Doesn't rev above 3k.
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hamburgler

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Re: Help with chipping P75 ECU.
« Reply #4 on: June 21, 2009, 01:47:46 AM »
I just did a P06...  same thing.  Fail.  I'm shuttin her down for the day.  I'm starting to think the stuff I got from my local electronics store is bunk.  Every kit I've ever bought  has worked.  Now that I'm doing lots of ECU's I can make my own kit for like $5 and thats what I have been using on the last two.

Does anything change with a Canadian model (P06-C01)?
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