MiguelKlein

Hi!

I am new in here but this forum helped me a lot already...

I am from Brazil and work on a Mercedes-Benz Dealership and I use to make some jobs at home...

Now I am working at home on a E320 W124.032 with the M104.992 that cranks but don't fire up...

I searched on the forum and found a lot of post about this problem but none with the exactly same problem.

this is what I am done untill now....

1- I opened all the engine wiring lookind for something wrong and found nothing
2- I looked the OVP and changed it
3- I changed the Crankshaft sensor and tested it on the ECU connector and readed RPM between pin 29 and pin 30 that means that the sensor works and the ECU read RPM.
4- the fuel injector pulse and the fuel relay works when I crank the engine
5- the coil have 12v but the ECU dont send the negative signal to the coil
6- It dont have spark on any coil
7- I verified all the positive and negative wiring on the ECU connectors, all OK
8- I installed the OVP, ECU and Coils from a working w124 on it and it didnt fire up
9- I installed the OVP, ECU and coils from the non working car in another car and that car worked

The problem is that the ECU does not send a negative signal to the coils and it has no spark

I would be grateful if anyone had any idea what it could be.

P.s. I do not have the cables to read the DTCs for this E320 and sorry for the bad English.


Thanks for Everything!