Ford Workshop Service and Repair Manuals

The particulate filter of the 1.6 Duratorq-TDCi (DV) engine is located behind the catalyst, looking in the direction of exhaust gas flow. The catalyst and particulate filter are combined into one housing.

The particulate filter is a honeycomb structure, the walls of which are made of porous silicon carbide In addition, the individual ducts are sealed at one side and offset to each other.

The soot particles which may still be present in the exhaust gas after combustion are filtered as follows: the exhaust gases charged with soot particles flow into the particulate filter and, because of the offset sealed ducts, are forced to flow through the porous walls.

The build up of soot particles in the intermediate chambers of the porous walls increases the filtration effect still further.

Particulate filter of the 2.0L Duratorq-TDCi (DW) engine

On the 2.0L Duratorq-TDCi (DW) engine, the particulate filter is also located, in its own housing, behind the catalyst, looking in the direction of exhaust gas flow.

The particulate filtration method is the same as that used by the particulate filter on the 1.6L Duratorq-TDCi (DV) engine.

Particulate filter exhaust gas temperature sensor

The exhaust system of the 1.6L Duratorq-TDCi (DV) engine has an exhaust gas temperature sensor for the particulate filter. The exhaust system of the 2.0L Duratorq-TDCi (DW) engine is equipped with two exhaust gas temperature sensors - one for the particulate filter and one for the catalyst.

The exhaust gas temperature must be at least 500°C for the soot particles to burn; the temperature is detected by the particulate filter exhaust gas temperature sensor and transmitted to the powertrain control module (PCM).

The exhaust temperature before the particulate filter is used as an input variable for calculation by the PCM, taking into account the values of other relevant variables.

Depending on the calculated exhaust temperature, the PCM then decides whether the regeneration process can be initiated or not.

Diesel particulate filter differential pressure sensor (DPF differential pressure sensor)

The diesel particulate filter differential pressure sensor (DPF differential pressure sensor) calculates, via a pipe, the current pressures in the exhaust gas flow in front of and behind the particulate filter. The diesel particulate filter differential pressure sensor (DPF differential pressure sensor) converts the measurements into a voltage signal and reports to the PCM.

The soot particles collected in the particulate filter and the ash cause a pressure change in the exhaust gas flow in front of and behind the particulate filter. The changing pressure caused by the volume of soot is used by the PCM as an input variable for determining the volume of soot.

If the measured value exceeds the stored maximum value, and taking into account the necessary boundary conditions, regeneration of the particulate filter is started.

In addition the diesel particulate filter differential pressure sensor (DPF differential pressure sensor) is used mainly for fault diagnosis.

exhaust gas recirculation (EGR) system

The EGR system of the base engine remains unchanged.

It does not operate during the particulate filter regeneration phase.

When the EGR stepper motor is renewed, an initialisation must be carried out using the Worldwide Diagnostic System (WDS).