flashing SES light
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 33
Likes: 0
From: Little Rock Arkansas
flashing SES light
i have an 85 coupe with TPI and my SES light ,with ign on, is flashing until i cross A and B at dia. terminal then it goes out. i've been chasing wiring all morning and still can not seem to find any problems. anyone aver run into this before ?
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 33
Likes: 0
From: Little Rock Arkansas
i talked to the guys at Street Performance here in Mena Ar(great guys by the way) told me to check all my grounds first. being solid suggestion i checked and cleaned all that i could remember and find.... still have the rapid flashing service engine light >< going to hook up scan tool tomorrow and see what it has to say. thanks for the info Seabright
Last edited by Ryque; Sep 14, 2013 at 11:14 AM.
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 33
Likes: 0
From: Little Rock Arkansas
i ran a scan on it this morning and got nothing, the scanner could not detect ECM. i replaced the ECM and the SES light flashed rapid for a minute and then became solid on. i started the motor and it sounded and felt much better but not right. i got i near operating temp and ran another scan, it read no codes present. after a bit more checking and testing i jumped the aldl and got code 12(diag mode) then code 51(faulty e-prom). going back out later to do more testing, just wanted to update my predicament.
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
YYou can find these EPROM's on ebay easily for under $100. Just make sure and get the right BCC (broadcast code) for your transmission.
http://www.chevythunder.com/prom_bcc_1985.htm
http://www.chevythunder.com/prom_bcc_1985.htm
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 33
Likes: 0
From: Little Rock Arkansas
the eprom was fine, i had bent a tab down when installing. all is fine and appears to be running good again. the best i can determine is a bad connector to the cooling fan relay caused it to ground through the fan motor itself firing the solenoid and surging the ECM. at least i hope that was it 
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