LMM & Boost Gauge: Common Questions Answered

Hi!
I have two questions.
1.) I think my mass airflow sensor (MAF sensor) is broken. How can I measure (or have measured) whether it is actually broken? If it is, how much does a new one cost? (VW Vento 1Z)
Where can I find this part at the lowest price?

2.) Wo kann ich den Ladedruck für mein VDO abgreifen? Engine: 1Z
Does anyone have any ideas about where I could install this VDO device in my dashboard?
Golf 3, also known as Vento.

Thank you very much.

Hi Ventoman,

At the 1Z engine, you can read the boost pressure at the engine control unit (ECU). There's a hose connected to a sensor integrated in the ECU that provides the boost pressure reading. This hose runs from the intake manifold to the left (directly at the pipe bend that goes upwards before it splits into four parts).

Hello,

Take a look at the error database. The "1Z" is also present in the target data.

Hi,

I installed my 52mm LDA in the lower middle storage compartment, in front of the gear lever.
There, for example, you can install a cassette or CD player from VW.
However, Oettinger also offers this product for two analog instruments.

...and so that I don't appear to be doing advertising for Oettinger: This thing isn't exactly cheap (over 40 euros), but it looks... well, it looks good. When installed, it looks quite nice.

Ventoman wrote:

Hi! I have two questions. 1.) I think my mass airflow sensor (MAF) is broken. How can I measure (or have measured) whether it is actually broken?

Hi.

As an approximate way to determine if the MAF sensor is faulty or working, you can tap into connector pin 6 of the MAF sensor connector, extend the wire into the passenger compartment, and connect a voltmeter to ground (e.g., the cigarette lighter) there.
To be on the safe side, the internal resistance of the measuring device should be in the range of 100 kOhms or higher. Therefore, it's best to use a digital multimeter (which usually has 1 MOhm or more).

The most interesting measurement is usually the one taken at full load, because it's directly related to the fuel injection limit, which significantly affects the engine's power output.

Okay, with a warmed-up engine, perform a full-throttle acceleration to 4000 rpm (preferably in 3rd gear or higher). During this process, the voltage should, as far as I know, increase to around 4.5 volts. Experts in lambda sensors may want to correct this value.

Unfortunately, insufficient boost pressure can also reduce the mass airflow sensor (MAF) voltage, thereby simulating a MAF sensor defect, even though the sensor itself is functioning correctly. Therefore, it is highly recommended to measure the boost pressure simultaneously.

Thank you for the answers.
Just one more thing. Where can I get a new LMM if needed?
Do I need to contact VW directly? They seem a bit too expensive.

Thank you.