what would cause this chip to burn up?

K-Series Programmable ECU installation questions / support issues
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boosted crx-r
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what would cause this chip to burn up?

Post by boosted crx-r » Sun Jul 12, 2015 3:50 pm

ecu will still run the car but will not connect to the laptop via the usb. also is this chip available for replacement? kpro1
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Hondata
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Re: what would cause this chip to burn up?

Post by Hondata » Sun Jul 12, 2015 5:10 pm

What happens is that the master ground is missing or disconnected or had a high resistance contact to the engine. Or one of the engine grounds is missing. Then if you connect a laptop which is grounded to the car in some way then all the current the ECU sinks travels down the USB cable. This current can be 5 or more amps, which is a lot more than USB can cope with, so something will give. It also has the effect of raising the ground plane in the ECU towards 12V, which then results in a negative voltage from the 5V supply to ground, which makes most electronics very unhappy.
Even if we replaced that chip on the KPro (which we don't) there is a very high chance that other parts on the KPro are damaged. You best option is to replace it.
From customer comments from when this happens it is normally after installing a new engine or rewiring for injectors.
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Re: what would cause this chip to burn up?

Post by boosted crx-r » Sun Jul 12, 2015 5:18 pm

this engine has been in the car for approximately 7 months with no issues. all ground are clean and tight. is there anything else i should look for before i install another kpro? i just want to be sure the same thing doesn't happen when the new unit is installed as they aren't very cheap.
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Re: what would cause this chip to burn up?

Post by boosted crx-r » Sun Jul 12, 2015 5:37 pm

could this be caused by the top of the ecu case coming in contact with the usb port on the kpro? i noticed the case has become dented and is touching metal to metal on the usb port.
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Re: what would cause this chip to burn up?

Post by Hondata » Sun Jul 12, 2015 5:39 pm

Assuming it is an engine swap, look at http://www.hondata.com/techk20swapgrounds.html
Use a multimeter to measure the ground current from the ECU case & USB shield with the engine running to be sure. Anything over about 20 mA is unusual.
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Re: what would cause this chip to burn up?

Post by boosted crx-r » Sun Jul 12, 2015 5:57 pm

ok.. thank you for the quick response. i will give that a shot
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Re: what would cause this chip to burn up?

Post by boosted crx-r » Mon Jul 20, 2015 5:37 pm

ok so im going to get a new kpro4. can i just plug it in and go or does the ecu need to be sent back to hondata since it had kpro1
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Re: what would cause this chip to burn up?

Post by Spunkster » Tue Jul 21, 2015 9:18 am

Assuming that the ECU is not damaged then the new K-Pro board will fit just like the old one.

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Re: what would cause this chip to burn up?

Post by boosted crx-r » Tue Jul 21, 2015 9:24 am

ok thanks
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