OK here's the skinny. I'm doing the 870 MAF to 730 SD swap. I've matched up pretty much all the wires except for the injector wires...

On my 870 ECM I have 4 injector pins but they labeled on my diagram as:

D15 - Inj. 1-3-5-7 "A"
D16 - Inj. 1-3-5-7 "A"
D14 - Inj. 2-4-6-8 "B"
C15 - Inj. 2-4-6-8 "B"

On my 730 diagram I have 4 injector pins labeled as:

C11 - Inj. 1-3-5-7
C12 - Inj. 2-4-6-8
D6 - Inj. drive low
D7 - Inj. drive low

Anyone have any ideas as to what goes to what here in the repinning?


__________________

 

"A" = High. "B"= Low. Hook em up

 

On the 730 ECM, D6 and D7 go to engine ground.
C11 and C12 go to one side of the injectors and are pulsed to ground by the ECM to fire them. The other side of the injectors just need to go to an ignition hot supply so they are fed power when the ignition is on. The injectors are fed power anytime the key is on and the computer grounds them to fire them.

 

So I should splice
D15 - Inj. 1-3-5-7 "A"
D16 - Inj. 1-3-5-7 "A"

into
C11 - Inj. 1-3-5-7

and splice
D14 - Inj. 2-4-6-8 "B"
C15 - Inj. 2-4-6-8 "B"

into
C12 - Inj. 2-4-6-8

and just ground
D6 - Inj. drive low
D7 - Inj. drive low

?

 

Yes, you are correct.

 

NO. C11 and C12 are ECM control grounds.

Run D15 - Inj. 1-3-5-7 "A" to C11
Run D16 - Inj. 1-3-5-7 "A" to C12

Do not use D14 or C12, they will not be used in your setup.

That is all you will need to do for injector wiring. They are already recieving power from circuits 639 and 839. The computer fires the injectors by grounding them through C11 and C12.

 

So I just ground:

D6 - Inj. drive low
D7 - Inj. drive low ?

Also what do I do with my old B7 - Electronic Spark Control Module wire, is that built into my new memcal? Can I just pitch it?

 

GO HERE, CLICK ON PAGE NUMBERS AT BOTTOM OF PAGE FOR 730 ECM ECM CONNECTIONS