2003 TOYOTA COROLLA MATRIX Engine And Engine Cooling Problems

IT'S BEEN ALMOST A YEAR SINCE THE FIRST TIME THE CIL TURNED ON. IT STAYS ON FOR A COUPLE DAYS THEN STAYS OFF FOR LIKE A MONTH. IT HAS BEEN DOING THAT SINCE 2012. I HAD MY CHECK ENGINE LIGHT CHECKED BY A TECH AND HE SAID THAT HE HAS SEEN THE P0770 CODE MANY TIMES FOR THE MATRIX AND COROLLA. HE PRINTED OUT THE TSB (HTTP://WWW.MATRIXOWNERS.COM/TSB/T-EG020-02.PDF) AND ADVISED ME TO TAKE IT TO A TOYOTA SERVICE CENTER. I TOOK IT TO CARSON TOYOTA IN CA AND THEY PRETTY MUCH SAID THE ONLY THING I CAN DO IS FIX THE ISSUE OUT OF MY POCKET WHICH WAS ALMOST $1500! HE SAID THE ISSUE IS THE R & R ENGINE CONTROL MODULE AND IF THAT DOESN'T DO THE TRICK THAT I HAVE TO REPLACE R & R SPEED SENSOR. I PURCHASED MY CAR USED SO IT DIDN'T QUALIFY FOR THE MANUFACTURES...