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Originally Posted by ngc604
ok not to sound like a dumb a$$ but wtf is the tcu? my d4 light starts blinking about once a month then i restart the car and it doesn't come back on for awhile.
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the tcu is the "transmission control unit" what year honda do you have? Im nto sure if this works on all the years but i do know for a fact that on the 90-93 models, if you get under the passenger side dash, and the little plastic piece against the right side of the car, by the hinges of the door.(its part of the plastic interior trim) Not sure how else to explain it......but there is a little blue plug thing that is just hanging loose. Take a paper clip and unfold it so the ends are pointed out.
then stickboth ends into the plug like you would electrocute urself, but dont worry, you will be fine. Then one the paper clip is inserted, hold it in there and watch ur gauges, it will throw a code, then once you know the code, there is a site somehwere that tells u what each code means, and t hen you will know exactly why the problem is happening!
But if u do not have a 90-93, then i do not know for sure if that plug is there or not!
good luck