Desperatly need the pinout to the 9278 (93)lt1 Ecm
08-18-2005, 07:14 PM
#1
Drifting
Thread Starter
Desperatly need the pinout to the 9278 (93)lt1 Ecm
I desperatly need the pinouts to the 93 lt1 ecm. Bruce's car went brain dead on us last night while idling in my shop. Now I get no spark/tach/fp etc. But before we go buy an ecm I need to check the basics 12v/grnd etc. Can anyone help? even post just the nessary ones, 12v in tach out anything power on related etc.
08-18-2005, 11:28 PM
#2
Safety Car
I have it but it is in Charles Probst "Corvette Fuel injection book, so there could be a few minor mistakes. when I wired the LT1 I put in my 84 the only mistake I found for the 94/95 wiring was the fan relay set up but what they had worked. Is there a particular section you need?
08-19-2005, 09:54 AM
#3
Drifting
Thread Starter
Any page concerning what the pinout for the ecm itself are. The car doesn't turn on anything. No pump, no delteq, no tach. No nothing. I have used a testlight on the connectors with the ecm unplugged and have found juice/ground on many pins, but have no idea where they go. Before we spend $$$$ on an ecm I need to confirm she's dead.
08-19-2005, 10:26 AM
#4
Maybe this can help- 90-91 ECM closest I could find
http://chevythunder.com/fuel%20injec...%20pinouts.htm
According to this page its a very similar ECM pinout
Good luck man. Hope you figure it out 
http://chevythunder.com/fuel%20injec...%20pinouts.htm
According to this page its a very similar ECM pinout
The 1992-93 model years use ecm # 16159278. It is similar to the 1990-91 Corvette weatherpak ecm. The connectors plug in the same way. The 1992-93 LT1 engines are MAP systems with batched fire injection. It also has a removable prom chip. The later years do not.
08-19-2005, 10:34 AM
#5
08-19-2005, 02:01 PM
#6
Drifting
Thread Starter
well it had some good info, I just ruled out the grounds for the ecm, sensor grounds and the battery feeds. I still need to find out the rest (if any ) of the wires. This thing really has me stumped, but I am flying blind at this point. Still no phone call from the machine shop, John. I hope he calls me by five or we'll be stuck until monday.
08-19-2005, 02:32 PM
#7
Originally Posted by Baldturbofreak
Still no phone call from the machine shop, John. I hope he calls me by five or we'll be stuck until monday.
Hopefully he'll call, if not thanks for trying.
08-19-2005, 06:06 PM
#9
Drifting
Thread Starter
fixed, It was a broken wire inside the insulator in the main engine harness. ISpecial thaks to john for lending me the oscilliscope, I would have never found the internittent connection without a graphical display. Thanky sooo much. Bruce, you owe that man a beer or 12.
08-19-2005, 11:11 PM
#10
Originally Posted by Baldturbofreak
fixed, It was a broken wire inside the insulator in the main engine harness. ISpecial thaks to john for lending me the oscilliscope, I would have never found the internittent connection without a graphical display. Thanky sooo much. Bruce, you owe that man a beer or 12.
08-21-2005, 12:49 AM
#12
Drifting
Thread Starter
The 12 volt feed (pink with a black stripe) I could get it to run, then not, then arm the pump, then nothing. so I went thru the harness where ever there were power feeds and observed the signal coming from the wire. The offending wire had a "blip" followed by a dead signal depending on how hard I yarned the harness. after it that it was a matter of chasing the wire down until I found the soft stretch part in the wire. Cut resolder. 3 days of hassle over a wire in the back of the harness. Be nice to your harness when you swap motors. 
04-21-2012, 09:57 AM
#13
5th Gear
Member Since: Apr 2012
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should the c12 pin be 12v. mine shows to be grounded through the pcm. car wont start no injector pulse or spark. if i apply 12 volts the car will start but wont stay running
Last edited by redline719; 04-21-2012 at 09:58 AM. Reason: forgot something
04-21-2012, 11:10 AM
#14
