Differential Pressure Sensors CFBG

Hello!

Today, I took a closer look under the hood. I noticed something about the DPF:
I found a total of three temperature sensors: one BEFORE the turbo, one BEFORE the DPF, and one AFTER the DPF. That seems okay. What struck me as odd was the differential pressure. I only found one connection point BEFORE the DPF, which was connected to the sensor. The other side of the sensor was connected to atmospheric pressure. Is that normal? It also looks like the connection AFTER the DPF is blocked with a blind nut.

Here are some photos of the sensor and the blind nut.

Hello,

Probably, the engine control unit simply estimates the pressure after the DPF. The advantage is that it saves a piece of pipe and a hose compared to a software function.
It might be sufficient to use a model that incorporates engine speed, fuel injection volume, and intake air mass to "estimate" sufficiently accurate values.

Best regards, Rainer.

I agree. The engine control unit (ECU) already has an atmospheric pressure sensor, and the resistance from the DPF outlet to the exhaust pipe is calculated based on a model.