Afm ( active fuel management ) aka d.o.d.

[djv86]

using the efi scan tool and commanding the A-D solenoids on and off one cylinder has a noise as if the lifter has an issue with latching and unlatching.

my question is does anybody know which solenoid is for which cylinder ?

wiring diagrams show pin location at the VLOM is A-E

A-cylinder 4
B-cylinder 6
C-cylinder 1
D-cylinder 7

Im unsure if thats how EFILive is using to figure out which one is which.....

using the gm tech 2 it commands them all off or on by funtion and the EFILive scan tool has them individually

[djv86]

here is the wiring diagram

[djv86]

Nobody has an idea which cylinder is what?

[GMPX]

Sorry I don't know how GM assign the cylinder number to A-D solenoid.

[joecar]

If you have access to the solenoid wiring, you may be able to probe with a DMM and see which cylinder gets commanded from the V7 scantool.

[djv86]

I mean I can pull the rocker covers off and at idle figure it out I just was curious if anybody knew off the top of their head. But thanks for the replys I'll figure it out eventually when I get working in the car again and when I find out I'll let you guys know :-)

[joecar]

Locate the wire harness, and if there is a connector, back probe it, otherwise use a piercing probe (and seal the hole immediately afterwards).

[djv86]

I figured it out. A,b,c,d just stands for in which order of the firing order the cylinders are fired in.

[joecar]

1-8-7-2-6-5-4-3
a---b---c---d--

a=1
b=7
c=6
d=4

Is this what you found...?

[Chevy366]

It shows C1,D4,B3,A2 on the diagram. Firing order right?