Question about 1988 Mazda RX-7

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1990 Rx-7 No spark - no power to coils

I disconnected the ECU but did not wait 10 minutes after the battery was disconnected. I put it all back together (ECU was ALL I touched) and tried to start it, but it did not fire. I found there isn't power to the coils now. All pins on ECU connectors are fine, I'm wondering if I managed to short something inside the ECU when I didn't wait the recommended 10 minutes after disconnecting the battery. All fuses are good as well. I basically drove the car to my house, disconnected the battery, disconnected the ecu, plugged it back in and now it is broken. Any ideas?? This all happened because my turn signals don't work and it is controlled through the ECU, so I thought I'd disconnect it and re-seat the connectors.

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Just taking a stab in the dark but theres this nasty wee gremiln called ESD electro static discharge ...
it rears its ugly head when you handle electronic componentry and your statically charged
(all you have to do is rub against the seat once or the carpet)...
what happens is the ESD's charge shorts out the CPU's 5v chip inside the ECU.....BUGGER!!!
the most common method used to overcome this and stop it from occuring is a grounded mat and wrist strap....
as a mechanic i know there are simple actions you learn as yu do your apprenticeship thats teaches you about safety precautions...
but if you do-it-yourself without clear knowledge sometimes things can happen....
my best advice is to remove the ECU and take it to mazda and get them to test it ...
alternatively and my favourite buy an aftermarket ecu and controller such as the apexi power fc (which i have in my fd3s)

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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