Mini R56 Project: Mass Air Flow Sensor Testing

[Wayne 962]

Anyone got any questions on the Project: Mass Air Flow Sensor Testing for your Mini R56?

Here's a back link to the original article: Pelican Technical Article: Mass Air Flow Sensor Testing

-Wayne

[SevensWorld3]

Your original post on this matter states as follows:

"In the past mass air flow sensors provided an analog signal to the DME. With the HFM6 sensors, they now send a digital signal. The old voltage testing methods no longer work. The yellow wire at terminal 5 on the sensor is referred to as the signal. If we read this signal with a DVOM it would display as a constant 2.5 volts. If we looked at the frequency, it would display about 60 Hz, not as expected from a signal.
In the past mass air flow sensors provided an analog signal to the DME. With the HFM6 sensors, they now send a digital signal. The old voltage testing methods no longer work. The blue wire at terminal 54 on the sensor is referred to as the correction signal. If we read this signal with a DVOM it would display as a constant 2.5 volts. If we looked at the frequency, it would display 1500: 2500 Hz depending on load."

Am I wrong, are these two reversed? I am reading 60Hz frequency from the Blue wire and 2KHz from the Yellow wire.

The reason I am asking is because I have relied on your articles from the past, but this one is really throwing me -- should I be checking to see if someone removed both wires from the DME then actually 'reversed' them from their former locations?

Your quick response is appreciated; this car needs to 'leave', it is eating me without permission.

[Luccia at Pelican Parts]

Originally Posted by SevensWorld3

Your original post on this matter states as follows:

"In the past mass air flow sensors provided an analog signal to the DME. With the HFM6 sensors, they now send a digital signal. The old voltage testing methods no longer work. The yellow wire at terminal 5 on the sensor is referred to as the signal. If we read this signal with a DVOM it would display as a constant 2.5 volts. If we looked at the frequency, it would display about 60 Hz, not as expected from a signal.
In the past mass air flow sensors provided an analog signal to the DME. With the HFM6 sensors, they now send a digital signal. The old voltage testing methods no longer work. The blue wire at terminal 54 on the sensor is referred to as the correction signal. If we read this signal with a DVOM it would display as a constant 2.5 volts. If we looked at the frequency, it would display 1500: 2500 Hz depending on load."

Am I wrong, are these two reversed? I am reading 60Hz frequency from the Blue wire and 2KHz from the Yellow wire.

The reason I am asking is because I have relied on your articles from the past, but this one is really throwing me -- should I be checking to see if someone removed both wires from the DME then actually 'reversed' them from their former locations?

Your quick response is appreciated; this car needs to 'leave', it is eating me without permission.

Please go to the article: MINI Cooper R56 Mass Air Flow (MAF) Sensor Testing (2007-2011) | Pelican Parts DIY Maintenance Article and scroll down to the box that says "write a comment." Copy and paste what you wrote here and submit it. Nick, the individual who wrote the article, will come in and respond to your question.