Check engine light

Hi and Thank You for your help.

Hi. Yes, you are correct, as per that line of the chart. But the *(asterisk) by the 0 is all important.
At the bottom of the chart said the asterisk reads that voltage should be less than 0.50.
When I probed the main relay A10 (blue wire from ECM), key on, I got 0.80 volts.

So, what is that telling us?

Voltage to and from main relay are correct? Or not?

Question, with key on and main relay connected, and ECM connected to wiring Harness how much voltage I should see at main relay terminal B and D.

I know that with the main relay disconnected and blue wire (which is A10 at ECM wiring harness plug) grounded, I get full battery voltage at ECM wiring harness terminals A12 and A13.

Sorry, in reference to sentence three above, the relay and ECM are both plugged in to their respectful wiring harness plugs.

Hi, voltage at ECM pins A12-&-A13 is indeed full battery voltage.

If it helps.
This "No Check Engine Light" condition has been quite Sporadic over the last 6-8 months.
The last time I drove it, I made 9-stops. The last one failed to start.
Now it's all the time.

Sorry Joe, I did not mean to be confusing to you. Thanks for the help. Curt

The Voltages I posted on May 17 at 3:13 PM are correct and are what I am getting when probing.

Hi, I will double check what you have suggested.
Check pin A10.

Hi,

Key Off,
Remove Main Relay,
Probe Blue Wire at Said Relay to Ground,
Ohms=3.283 million,
Plug Relay in and turn on key,
Voltage=0.80 VDC.
If it helps, the fuel pump relay is not being activated when key in in run position.
I can make the fuel pump run (listen to fuel filler) and Fuel Pressure is present at Rail.
I do have a test (yes-no) chart in my service manual that I performed twice just to be sure I was doing it correctly.
The net result was open circuit in ECM.
Thank you for your patience on this.
Curt

Okay, well I did not replace any parts as of yet. So, I'm not understanding your question.
If I'm preforming tests on main and fuel relays correctly, then the ECM is faulty.
I'm going to look for another ECM, plug it in and see if it runs.
If the car does not run, then I'm going to sell it and move on.
For giving your time to a stranger, until you're better paid.
Thank you and may the day be smooth.
Curt.

P.S.
A great web site you all have here and a welcome service to the public.

It's all good.
Trying to accurately diagnose any drivability sight unseen is a challenge in itself.
You responded to the information you were given.
Yes did good.
Curtis

Hi, I installed a remanufactured ECM. Key on, all dash lights on, starts and runs great. Open and closed loop both function they should.
Curt.