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Old 08-10-2019, 10:07 AM   #1
250ptm
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Location: Tasmania
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Subframe: Other
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ECU: odb1
Default Warning Potential ECU Failure

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Last edited by 250ptm; 09-10-2019 at 12:20 AM. Reason: phototo big
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Old 08-10-2019, 10:09 AM   #2
250ptm
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ECU: odb1
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Here is a picture of my recently removed stock Honda ECU. It was a JDM P30-N01 which was made approximately 22 years ago. I hope you can see it!!!!


The cause of the carnage was a blown main capacitor that leaked electrolyte over the board. This highly corrosive fluid ate into the PCB tracks and caused a major short circuit that melted the Main Diode off its posts. The melted diode got so hot, it put scorch marks into the ECU cover, and the smell of fried electrical parts inside the car was really bad.

A typical Capacitor failure can be seen by some bulging at the top, all the others in this ECU were OK (i.e. Flat)

All I saw was a puff of smoke from under the dash as I turned the ignition on, quite annoying really, as I was being interviewed for a spot on a U- tube Car channel at the time…..It never aired, go figure!

In my case, the car would still start and run, however, it went straight into LIMP mode which meant none of all the fancy ECU computer controlled stuff, like Ignition advance, crank angle sensor, MAP, TPS, IACV, Vtec, etc etc, were available. Just a basic 3000rpm limit, a smelly rich mixture from the exhaust and fixed timing, (similar to a well running A series) LOL.

My lesson learned: A 1997 ECU Capacitor will not last forever. They can FAIL.

After a very lengthy check to verify no compromised wiring, my car is now running faultlessly with a replacement ECU (fitted with 8 brand new capacitors).

A word to the wise, ODB1 B16A/B18 ECU’s can run at a premium price wherever you are living, however, replacing the capacitors is a job well within everyone capability, it is a more cost effective alternative to a full replacement or suffering a potential failure. My suggestion is adding this on your maintenance TO-DO list if you have an “original stock” ECU.
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Last edited by 250ptm; 08-10-2019 at 10:18 AM. Reason: still no pic, why isnt the upload feature fixed ??
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Old 08-10-2019, 05:40 PM   #3
fynnbar
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ECU: Standard obd1-P30
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Thank you for that - mine is 1992
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Old 09-10-2019, 12:15 AM   #4
250ptm
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ECU: odb1
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figured out how to upload from imgur!!
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Old 10-10-2019, 04:26 PM   #5
gonk43
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ECU: Honda 0BD1
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nice one 250ptm.
You know what, might replace capacitors in my spare, then swap.
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