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Replace your ECU Capacitors or your car will explode. Srsly

Thanks the info! Never knew of this problem!! I'll be buying mine this evening!
 

hi i have 94 eterna twin trubo with a ecu problem
engine light, tracktion contol light and the 4ws light comes on
after replacing ecu due 2 jump staring incorrectly
and have prolems with cold starts never had that problem
before "stupiddly" helping a naighbour 2 jump start there vehical

any remerdiez would be very helpfull
 

Terry Posten

Well-known member
Joined
Dec 16, 2003
Messages
9,009
Location
Davenport, Iowa USA
Yes, but they most likely have never seen one of these before and may not be able to find all the little places that go bad when acid leaks. And they may not have the correct spec caps and might try and make it work with parts that are not correct of up to par for the environment the ECU sees.
 

383mazda

Well-known member
Joined
Oct 10, 2015
Messages
61
Location
Gainesville, TEXAS
I purchased the replacement caps and they are physically much smaller, is this normal?



The "Digi-Key PN links" are broken on the How-To site, so I tried to find the closest ones they had:

22uF 50V: P5568-ND (mfg PN: ECA-1HHG220)

100uF 25V: P5540-ND (mfg PN: ECA-1EHG101)

47uF 50V: P5570-ND (mfg PN: ECA-1HHG470)

Have caps just gotten smaller in the past 20 years, lol??

Caps on my board are in good shape though so I'll wait to swap them.

Thanks for help!
 

fuel

Well-known member
Joined
Feb 23, 2009
Messages
2,161
Location
Toronto, ON, Canada
Yes, much like how computer processors and hard drives have got physically smaller in time capacitors too have shrunken. Always make sure you retain the correct capacitance, but if the exact voltage is not available you can safely substitute in higher voltage units.
 

FlyingEagle

Staff member
Joined
Mar 5, 2005
Messages
1,635
Location
THE Ottawa
Quoting 383mazda:
Caps on my board are in good shape though so I'll wait to swap them.



They HAVE to be swapped out, period. Do not wait. This is the only advice you can accept for this era ECU/TCU.

Do it, forget about it and never look back. They can and will leave you stranded otherwise.
 

383mazda

Well-known member
Joined
Oct 10, 2015
Messages
61
Location
Gainesville, TEXAS
I only meant I'd wait until I got a reply or found the correct caps - turns out what I have will work, so I'll be swapping them this weekend /ubbthreads/images/graemlins/smile.gif

Thanks for help guys!
 

Jvimpty

Member
Joined
Oct 30, 2015
Messages
24
Location
State College, PA
I did this last weekend while changing out a heater core. Ordered parts from Mouser:

Part numbers and links here:

1
RoHS: Compliant1
667-ECA-1EHG101
ECA-1EHG101
100uF 25V
click

2
RoHS: Compliant1
667-ECA-1HHG220
ECA-1HHG220
22uF 50V
click

3
RoHS: Compliant1
667-ECA-1HHG470
ECA-1HHG470
47uF 50V
click

In case folks wanted another source, some of the links in previous posts had gone dead.

Jeremy
 

rada974

New member
Joined
Oct 12, 2015
Messages
1
Location
Caracas, Venezuela
Hi, Today I opened the ECU and despite seeing the capacitors well I am in the doubt that the 100 uf is 16v and not 25v as you indicate, so I see the previous owner took the ecu to the service. I leave that capacitor or change it by what you indicate?

Regards
 

simo

New member
Joined
Jan 17, 2017
Messages
2
Location
Perth Western Australia
I wanted to stess the importance of replacing the capacitor in the ECU. The capacitors used are electrolytic capacitors which means they are acid based over a period of time and heat cycles they will expand to the point where they will become porous and will leak acid on the board. Know symptoms of this is random stalling, a fish like smell, injector(s) not working. I know there is more, maybe Jeff will be nice and chime in.

REPLACE YOUR CAPACITORS! or else you will be mad.
Have done mine and also replaced the large ignition diode. Very easy to do and huge difference
 

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