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Hacking up Honda's ECU
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PostPosted: Thu Apr 29, 2010 11:59 am 
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When where you power on your petrol pump so first of all check your power connection.then your pump engine light. don't move any body Working with mobile phone or lighter.don't use any kind of fire related part in pump.pump prime should occur at the same time when power is Applied to the ECU so check engine light


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PostPosted: Mon Jun 07, 2010 10:16 pm 
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7rrivera7,

To confirm, the only component that you replaced to get an ECU that would not prime the fuel pump is IC17, correct?

If this is the case this is a good thing. I have quite a few ECUs with this problem just laying around.

-kenji


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PostPosted: Sat Jul 24, 2010 5:56 am 
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Here is a answer to your question that fuel pump delay also due to some garbage in the fuel that is causing problems for the fuel to pass through it. Check it out.



Sightline Payments Kirk Sanford
dewatangkas


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PostPosted: Thu Jan 03, 2013 10:33 am 
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what to check next when I installed an new main capacitor, new ta8903 and new qm3 :?


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PostPosted: Mon Jan 28, 2013 10:21 am 
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Joined: Tue Jul 27, 2004 2:16 am
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Location: Puerto Rico
Good to see these ECUs are getting repaired!


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PostPosted: Fri Feb 15, 2013 4:33 am 
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Joined: Sun Mar 08, 2009 11:12 pm
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Location: Malaysia
e-tech wrote:
Thanks.... guess i have to try harder to help those with the longtype ecus... i dun't get much of those here...mostly JDM square ecu.

BTW is there a way to check by multimeter if the TA8903 Power Supervisor IC really spoilted?

Thanks again for sharing....

guess, others than Ta8903,what else involved in this issue (CEL not turn OFF)..any others component??


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PostPosted: Wed May 16, 2018 10:18 am 
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this post is very old, yet I feel compelled to add some info to it. There's one simple way to test TA 8903 and determine if it is the culprit of fuel priming. In fact, I had several cases where the pump did not pump at all. The procedure goes like this: use a heat air gun at 200 Celsius for several seconds to heat-up the TA8903, then quickly power-up the ecu while monitoring IC7 pin 32 (this is the fuel pump pin). It should start low (0 v) and two seconds later go high (5 v). When cold (pump failure present) this pin goes high and stays high all the time power is present. Also you can confirm that RESOUT pin in main processor (pin 21) stays low (0 v) while power is applied. If you heat the TA8903, then pin 21 goes high (5 v) for a split second to reset the CPU as it should (this test is done with a scope or a fast response multimeter). Few minutes after heating the IC, the failure should come back.

Finally if you don't have the spare TA8903 procede like this (it could or could not work):

take the TA8903 out of the board. Use an iron heated to 400 Celsius and put a big blob of solder over the IC and roll it with the iron all over its body for 30 seconds to one minute.
The TA 8903 should come back to life for a longer time. Maybe even enough to use the ECU while you find your spare. You should find a spare IC ASAP, otherwise it will fail again without notice.

BR.


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PostPosted: Mon May 21, 2018 6:19 am 
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Hello I was the person who originally posted that this IC needed to be replaced to resolve this issue ;-)

However...I still have several ECUs that still fail even after replacing this part and I have them stored for when I have time to continue troubleshooting. The schematics do not show any other main components involved other than the ones already listed so if anyone has found a solution to this problem even when replacing TA8903 with a new part (or more than one as I have), please let us know.


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PostPosted: Fri Nov 02, 2018 2:31 pm 
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Joined: Tue Jul 27, 2004 2:10 am
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7rrivera7 wrote:
Hello I was the person who originally posted that this IC needed to be replaced to resolve this issue ;-)

However...I still have several ECUs that still fail even after replacing this part and I have them stored for when I have time to continue troubleshooting. The schematics do not show any other main components involved other than the ones already listed so if anyone has found a solution to this problem even when replacing TA8903 with a new part (or more than one as I have), please let us know.


along with changing out TA8903 have you tried replacing IC17 and replacing all capacitors with new caps?

also where did you purchase new TA8903's from?

thanks =)


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