Audi 2.5 TDI MWB 4 Injection Timing IS NOT displayed

Hi,

After I had problems with the fuel pump in my 2.5l TDI engine (MEK: AKE), and I replaced the fuel pump control unit, the engine is now running again, but it is not developing power, and the starting timing cannot be correctly adjusted.
I am fully aware that what I have done may not be 100% accurate.
But at 400,000 km, a costly repair for this car is not worthwhile, so I have tried to get it back on the road with minimal effort so far.

Where I would now like to ask for your help is, from which sender the control unit receives the value for injection start IST value in the measurement block 4.
The measurement blocks 000 and 18 are OK. The MWB 000 also displays values for the injection start.
But with measuring block 4, I'm having problems, no matter how I adjust the injection start time in the MWB 4, it always shows IST value of 0.0° below the injection start.
Tried 3 different nozzles with NHG, same result. Measurement of resistances and checking for short circuits were all found to be satisfactory for all three NHG units.

If you have any tips for me, I would be very grateful.

Best regards,
Hinnerk

Hi,

Quote:

But with measurement block 4, I'm having problems, no matter how I adjust the start of injection at the fuel pump in the MWB 4, it always shows IST value of 0.0° before the injection start. Tried 3 different nozzles with NHG, same result. Measurement of resistances and checking for short circuits were all three NHG (Non-Harmonic Generation) units found to be satisfactory.

If the engine control unit does not have a "Pfuschtuning" and the engine is not running on 5 cylinders, you should check the cable from the NHG (presumably a sensor or module) to the engine control unit.

Best regards, Rainer

Hi Rainer,

thanks, I'll start the search.

Best regards,
Hinnerk

Please post another car scan...