Carb to TBI conversion

[Dan Brown]

Okay, thx a lot, looks just like the way mine is currently wired. Now, since my check engine light won't come on, is there anything else that could be causing it to not come on besides a failure inside the ECM?

[stew86MCSS396]

In the 1227747 schematics you sent me, the schematic on the top row far right is the schematic I have which shows the spliced brown/white wire going to pin D in the ALDL.

Ahhhh...I didn't see that and ironically albeit not originally 1227747 but it would be plug and play, my '85 Caballero has a brown/wht wire going to ALDL D. I have no idea if it's spliced as you have said. I keyed on engine off and measured for volts and only got 0.1v. I verified that my ground was good checking volts on the cigarette lighter.

Edit: Wait a minute, the last schematic says it should read 0v with key on eng off but 14v with engine running.

[Dan Brown]

I'm not sure I'm following what you are saying about the brown/white wire going to pin D in the ALDL, but I still can't make the check engine light come on knowing that the bulb is good and there is 12 volts going to the bulb and the brown/white wire has continuity all the way to pin A5 at the ECM. With the ignition on, and 12 volts getting to the bulb, does anybody have any idea what I should see at pin A5 if I back probe it?