When checking signal voltage at ecu do i do one pin at a time? Pin 9 then pin 50? Or i test them together? Not familiar with checking volts and measuring ohms. An i need the ecu harness actually plugged in right?
My apologies for such noob questions
Engine 1988 GT CA MAF plug different size?
- Thread starter Png1978
- Start date
When checking signal voltage at ecu do i do one pin at a time? Pin 9 then pin 50? Or i test them together? Not familiar with checking volts and measuring ohms. An i need the ecu harness actually plugged in right?
My apologies for such noob questions
-
Sponsors (?)
None of those caps are leaking.
Conformal coating is intact.
Conformal coating is the green tinged somewhat waxy coating over the entire circuit board assembly.
https://www.techspray.com/the-essential-guide-to-conformal-coating
Therefore, I will assume ECU is good.
I think these old ones are better than the later ones.
They were careful choosing parts & performing assembly, since it was all new to Ford & Hitachi (who designed & built much, if not all of it for Ford). You'll see Hitachi's name on the MAF sensor.
It looks like my original DA1, just about perfect. Even the port connector looks brand new.
Now I suspect a corroded connection between the MAF & ECU.
A corroded connection will cause a voltage drop, which is like adding a resistor where none is called for.
It's like a blockage in a water line to your house or what causes a heart attack in you.
BTW, I used to design & build circuit boards for the aerospace/defense industry, so in this area, I am an expert, especially old ones like this.
FYI. The 5th pic with the long "chip"with the yellow rectangle on top is the PROM (Programmable Read-Only Memory). Those were UV erasable & had a clear window on top, where you could see the real chip inside.. After they burn it with the program, they cover the clear window with paint or a sticker.
So what youre saying is i can rules out a bad ecu?
Sorry to sound incompetent but how? I wouldnt be able to access pins with ecu plugged in. Is the relay im point at the eec main power relay?
Attachments
You'll need to "stab" the wire with something like a safety pin, and then touch the pins with your voltmeter to test.
Do it up at the MAF first. If you are getting abnormal readings there, then the MAF is bad.
If the readings are fine, you check at the ECU to see if there's a bad connection or broken wire.
Test at the MAF first.
Do it up at the MAF first. If you are getting abnormal readings there, then the MAF is bad.
If the readings are fine, you check at the ECU to see if there's a bad connection or broken wire.
Test at the MAF first.
Similar threads
