The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Rodstored-72's 1986 DD build

rodstored-72 · 12-13-2021, 11:06 PM

I will throw a post in here related to the wiring. I followed the pinout info. From lt1swap (Brendan). Between his info and my GM engine diagrams I believe

I have the engine, computer, and DBW pedal all connected correctly. Finally

I also got the OBDii port wired correctly. Talking with a friend with the hp tuner software, not to mention nudging from a few board members… I FINALLY figured out the correct pin assignments to read the ECM!...

!! Below is the obdii port pin out. This is for a E38 ECM from a 2013 chevrolet Silverado.
Pin 1 thru pin 3= empty
Pin4= signal ground
Pin5= chassis ground
Pin6= ECM pin28 (2500) tan/blk canbus(+)
Pin7 thru pin13= empty
Pin14= ECM pin27 (2501) tan canbus(-)
Pin15= empty
Pin16= batt. (+) const. power
For me I used pin J5 from the “X4” connector (640) red/wht wire for pin 16.

12-13-2021, 11:06 PM	#145
rodstored-72 chevy truck fan Join Date: Mar 2005 Location: Gilbert, arizona 85298 Posts: 1,970	Re: Rodstored-72's 1986 DD build I will throw a post in here related to the wiring. I followed the pinout info. From lt1swap (Brendan). Between his info and my GM engine diagrams I believe I have the engine, computer, and DBW pedal all connected correctly. Finally I also got the OBDii port wired correctly. Talking with a friend with the hp tuner software, not to mention nudging from a few board members… I FINALLY figured out the correct pin assignments to read the ECM!... !! Below is the obdii port pin out. This is for a E38 ECM from a 2013 chevrolet Silverado. Pin 1 thru pin 3= empty Pin4= signal ground Pin5= chassis ground Pin6= ECM pin28 (2500) tan/blk canbus(+) Pin7 thru pin13= empty Pin14= ECM pin27 (2501) tan canbus(-) Pin15= empty Pin16= batt. (+) const. power For me I used pin J5 from the “X4” connector (640) red/wht wire for pin 16.