Check for loose pins in the connection to the MAF

 

Okay I just finished testing. Grey Wire (Power) shows a constant 5.0 -5.02 volts. Then tested the Orange Wire (Ground) which showed a constant 14.8 volts. The Green Wire (Signal) displays a dead 0 for volts, no fluctuating or anything when applied to vacuum.

This means the MAP sensor is fried right? Also I have 140,000 miles on the car. (:

 

I just checked PINs and connection. All tight and fitted. Im assuming now that I need a whole new sensor.

 

Also its the MA(P) sensor not the MAF. The code P0107 is present for the MA(P) sensor. (:

 

Then check the connections to the MAP sensor and the oring


https://www.rockauto.com/en/catalog/...)+sensor,11207

 

That's not the way I read the link.

reread step #4.

The black lead of your VOM should be grounded.
Unplug the connector. Key on run
Probe the connector pins with the red lead.
Gray (on the connector) should be 5VDC.
Orange (on the connector) should read 0Vdc and have a resistance reading other than infinite or zero when you set the VOM to Ohms.

The "signal" should vary from 1VDC to 4.5VDC, depending on vacuum. When the sensor is plugged in, key on run.

Grey is not "power" it is 5V ref, it should be rock steady 5V.
Orange/black is not ground it is low ref (sort of ground).
Green is signal.
You need to think digital not analog.

The other end of all of those wires are in the connector at the ECM.

 

Ok I unplugged the connector, turned the key to the on position, and retested the wires.

Orange gave me 14.53vdc with .237 on ohms and a beep

Grey still gave me a constant 5vdc

After I connected it back, I started it up and tested the green wire but still only got 0vdc.

 

Where is the black lead of the VOM when you probe?

Are you probing the back of the plug.

Are you sure that's not -14.53 vdc?

What wires could you have disturbed when you did the air filter?

The low ref should not be giving a positive voltage reading.
The 5v ref seems good.

Carefully inspect the rubber hose from the air cleaner to the throttle body. Look for cracks and rips and loose clamps.

So, my guess is there are wires touching somewhere. Might be the sensor is bad, if they are cheap get one and see.

They are $3-$30 on eBay if you can wait for delivery. NEW PREMIUM HIGH PERFORMANCE MANIFOLD PRESSURE MAP SENSOR GM VEHICLES AS60 | eBay
about $40-$50 at a store. https://www.gmpartsoutlet.net/oem-pa...0ybC1sNC1mbGV4

 

Or my link back #15 to Rockauto. Or a disturbed groundwire!

 

Ok. With the Key on run the Red probe on the orange wire and Black to ground I got 0vdc .000 ohms (2m) and 0.00 ohms (20m)

If I test the orange wire the other way around (black to orange and red to power) I get 12.2 vdc and 0 ohms.