LMM Disconnect: Troubleshooting & Fixes | Posts 16+

Diro wrote:

After disconnecting the plug at the mass airflow sensor (MAF), the performance, including the top speed, is the same as with the plug connected. Now the question is, is it the MAF sensor or perhaps the engine control unit (ECU)?

Most of the time, this kind of issue is caused by the mass airflow sensor (MAF). The engine control unit (ECU) itself seems to be more robust than the rest of the system combined.

Is the turbo boost pressure okay? Too little boost also reduces performance.

Quote:

Does anyone happen to know the relay layout from the fuse box? The right one sometimes clicks when I accelerate, if I've located it correctly.

The fuse box is different in almost every car. If the problem is coming from there, it's usually relay 109 --> try replacing it as a test.

I would appreciate any information you can provide.

Best regards, Diro.

Hello everyone,

"This weekend, I had the opportunity to test a 100% functional Mass Air Flow (MAF) sensor from another Golf III TDI in my car, and I also installed my MAF sensor in the other Golf. The result was that the other Golf ran without any problems with my MAF sensor, while my car exhibited the same power loss with the other MAF sensor. This means that the MAF sensor is definitely not the problem. How and where can I have the boost pressure measured? Unfortunately, I don't have a boost pressure gauge."

Best regards, Diro.

Diro wrote:

How or where can I have the boost pressure measured? Unfortunately, I don't have a device to measure boost pressure.

Hi.

My suggestion would be to install an LDA (Linear Drain Amplifier) at this opportunity.
The material is likely to be no more expensive than a thorough test drive conducted by a (competent??) workshop, including the recording of measurement data.

You'll probably get something from that ad later on, once the car is running again.