Hello, everyone,

Today I had another strange case and I hope I can be of help as I lost almost two hours in the workshop to one of our customers.

FORD CMAX 1.6 TDCI 80KW YEAR 2008 BOSCH ECU EDC16C.

Diagnosis with logic tester: P242F DIESEL ANTI-PARTICULATE FILTER - OSTRUCTION/ACCUMULATION OF ASH.

I read from the differential pressure parameters: at 3000 rpm value 300 mb.

From this we deduce that indeed the filter is clogged. Well, it's simple, I tell the customer to go to CODES and carry out forced regeneration. The screen appears with the usual premises and basic conditions, I press OK and after just 2 seconds the screen OPERAZIONE CONCLUSA appears. Regeneration does not start.

I go to the customer:

The error cannot be cleared, engine temperature OK, temperature before and after DPF OK, brake and clutch switch OK but regeneration still does not start in forced mode and the screen OPERAZIONE CONCLUDED always appears.

In the CODING menu there is the function RESET DPF VALUES. I execute this function and actually in the parameters the ash accumulation value shows 0 grams. At this point I think that forced regeneration will now start, but nothing happens. Not satisfied, I change the Diagnosis Tester, use KTS BOSCH and the moral of the story is exactly the same.

The error is not cleared and forced regeneration does not start.

What do I do, I disconnect the hoses from the differential pressure sensor and check from parameters whether it measures correctly and in fact pressure value 0 mb and accelerating does not change anything.

I disconnect the electrical connection of the pressure sensor and reattach it. I try to clear the error as if by magic the error clears. At this point I said this time the forced regeneration must start, but it doesn't.

In the end I just disconnect the hoses going to the differential pressure sensor and with no error present forced regeneration starts. One thing that will certainly happen to you if you carry out this procedure is that you will then get the error after about 10 min: regeneration time too high, but this is normal as the control unit no longer has the pressure sensor references or to avoid this after about 5 min that the car remains accelerated due to regeneration you connect the sensor hoses on the fly, be careful though as they get a little hot.

All this without replacing any components.

I hope it can be useful to everyone.