LMM Bosch Mercedes Values

Hello,

I own a Mercedes E290TD W210, manufactured in 08/1996, and I'm experiencing a problem with the vehicle. When the car is in 'limp mode' (maximum 3000 rpm, poor acceleration, maximum 120 km/h), it runs only when the lambda sensor is connected.
If I disconnect the plug from the LMM, it runs relatively normally again (revs up to the maximum range, but with poor acceleration).
Since the diagnostic code P1470, 'INSUFFICIENT AIR or FUEL RATIO - FUEL DELIVERY SIDE', does not allow for targeted troubleshooting, I would like to measure the values from the LMM (Lambda Sensor). A new LMM costs 384 euros, which is too expensive for me to simply replace.
I was able to measure the following values with the LMM connected:

PIN1: LMM signal 0.13 V when ignition is on
1.62 V - 3 V Idle - 3000 RPM
PIN2: 2 V
PIN3: Unassigned (no PIN)
PIN4: No voltage or ground signal present
PIN5: Ground

According to http://community.dieselschrauber.de...opic.php?t=3347
Bosch LMM values should have a 5 V connection.

What is the need for 5V, and where should this voltage come from (LMM output or input)? Even with a disconnected plug, there is no 5V present.
Do the values according to the community... apply to all Bosch mass air flow meters?
Do you think the LMM is over?

I have already checked the turbo for free play and pressure (just pressure values), as well as all air/pneumatic hoses from the intercooler, magnetic valves, and vacuum lines.
Everything seems to be sealed.
I would be grateful for a tip.

Greetings

Kebayer

Kebayer wrote:

PIN1: LMM signal 0.13 V when ignition is on 1.62 V - 3 V Idle - 3000 RPM PIN2: 2 V PIN3: Unassigned (no PIN) PIN4: No voltage or ground signal present PIN5: Ground According to http://community.dieselschrauber.de...opic.php?t=3347 Bosch LMM values should have a 5 V connection. What is the need for 5V, and where should this voltage come from (LMM output or input)? Even with a disconnected plug, there is no 5V present.

In the VAG applications (like "how long have I waited to be able to use this word "), the 5V come from the engine computer and, as far as I know, serve as a reference value for the LMM to adjust to the ADC in the engine computer.

Quote:

Do the values apply to all Bosch mass air flow meters...?

That should be answered by other people (-> Gremlin . . .?), but it would probably be helpful if you posted your LMM boss number.

The LMM has the following part numbers:
Bosch Part Number=0280 217 509
Mercedes Part Number=A0000940848

Thank you and best regards.

Kebayer

Funny...
In the current sensor catalog, it is not listed, but it is in the online catalog...

I suspect, based on the number (217), that it is an HFM-2.
then he really only had 12V as the supply voltage...

See you, Gremlin

Thank you for the information, but the occupancy figures do not match my LMM.
I have now been able to find a circuit diagram with a connection diagram and have discovered that the LMM is functioning correctly.

Greetings

Kebayer