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?
On my vehicle, I do have continuity from ALDL D to ECM A5. If you back probe A5 with the key on engine off, it should be 0v. If it's showing voltage, perhaps the ECM thinks the engine is running??? Idk what the ECM looks for when that happens, maybe distributor ref pulse? I'm sure there's a number of ways to force a CEL by disconnecting a sensor.
Okay, my engines not running as it's not ready to start yet, but, I do currently have 12.5 volts on A5 at the ECM connector. Anybody have any idea why?
I think I'm on to something. I bought another ECM from Ebay and it makes the light come on. However, I'm not sure the two removable components are compatible with a 350 (5.7L). Can somebody tell me the correct numbers for these components. Right now the smaller removable component of mine is 16051637 and the one that turns the light on is 1606837. The larger removable component is 6D12 3466 and the one that turns the light on is AMTU. Too, there is sticker with a bar code on it, the ECM that won't turn the light on has the number 427561314838156 and the one that turns the light on is 427561100178190. Do these numbers tell anybody anything. Thx a lot.
Okay, I think I'm good. I swapped both components, which were for the 350, from my original ECM that wouldn't turn the light on to the one I just bought and now the light not only works, when I plug in a code scanner it flashes and continues to flash 12 as long as I keep it plugged in. Now I only hope that when I get the engine started it keeps flashing 12. Fingers crossed.
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