MAF problem. 1 year and can't figure out

Hey guys. This MAF is killing me. Check video.

https://imgur.com/gallery/Zu8QH0Y

Pin1- ignition voltage
Pin2-manifold absolute pressure sensor low reference. This wrong in Opel tis. This is ground 
Pin3- intake air temperature sensor signal
Pin4-mass air flow sensor signal
Pin5-mass air flow sensor low reference

Now you can see from the video the reading I get on pin 4 at idle. 

Now I checked voltage with connector disconnected and pin 4 is 5.1v pin 5 also 5.1v 
I have ground and voltage. Temperature sensor reads well. And I have no codes.

Hey guys. This MAF is killing me. Check video.

https://imgur.com/gallery/Zu8QH0Y

Pin1- ignition voltage
Pin2-manifold absolute pressure sensor low reference. This wrong in Opel tis. This is ground 
Pin3- intake air temperature sensor signal
Pin4-mass air flow sensor signal
Pin5-mass air flow sensor low reference

Now you can see from the video the reading I get on pin 4 at idle. 

Now I checked voltage with connector disconnected and pin 4 is 5.1v pin 5 also 5.1v 
I have ground and voltage. Temperature sensor reads well. And I have no codes.

It would be helpful to post the model, year and engine type, along with the main complaint and any fault codes from the ecu

Zafira B 1.7dtr and no codes from ECU rough idle and no power

Have you replaced the SCV, very common to fail on this engine causing black smoke, rough idle etc, etc, maybe this is causing the rough idle which is why you have erratic readings from the maf.

Zafira B 1.7dtr and no codes from ECU rough idle and no power

Could this be a follow up thread to this? https://mhhauto.com/Thread-Zafira-B-1-7d...roblem-MAF

It is possible this car has other known issues too 

From the older thread with the video of live data, the MAF issue should be addressed. It is indeed implausible. The wiring integrity needs to be tested from the MAF to the PCM. Use whatever test gear you have, either a scope or simple low current test light. This way you can prove the suspect ground pin if the test light illuminates and do the same with the power. For the signal wires, use a scan tool and the test light powered or grounded to check if it will pull the signal up and down. If wiring checks out consider a bad MAF, bad PCM or its power supply. 

Do follow up with the other advice given also 

regards

Have you replaced the SCV, very common to fail on this engine causing black smoke, rough idle etc, etc,  maybe this is causing the rough idle which is why you have erratic readings from the maf.

I did replace scv, also did back probe and I get the same fluctuation on voltage. Of 0.4 0.3 up and down. Almost like the MAF

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Zafira B 1.7dtr and no codes from ECU rough idle and no power

Could this be a follow up thread to this? https://mhhauto.com/Thread-Zafira-B-1-7d...roblem-MAF

It is possible this car has other known issues too 

From the older thread with the video of live data, the MAF issue should be addressed. It is indeed implausible. The wiring integrity needs to be tested from the MAF to the PCM. Use whatever test gear you have, either a scope or simple low current test light. This way you can prove the suspect ground pin if the test light illuminates and do the same with the power. For the signal wires, use a scan tool and the test light powered or grounded to check if it will pull the signal up and down. If wiring checks out consider a bad MAF, bad PCM or its power supply. 

Do follow up with the other advice given also 

regards

Yes it is a follow up. I did replace ECU with a used one. I did not test wires with a load from a test light. I will do that next. I did try a brand new MAF with no success. At this point I'm thinking is the connector to MAF, I'm going to check for continuity, resistance between pins on connector