The exhaust system of the 1.6L Duratorq-TDCi (DV) engine incorporates a diesel particulate filter exhaust gas temperature sensor.
The exhaust gas temperature required for burning off the diesel particulates (at least 500 ยฐC to 550 ยฐC) is detected by the diesel particulate filter exhaust gas temperature sensor and transmitted to the PCM.
The temperature of the exhaust gas prior to passing through the particulate filter is used by the PCM as an input parameter for calculation purposes. The values of other relevant parameters are also taken into account. Depending on the exhaust gas temperature calculated, the PCM decides whether or not the regeneration process can be initiated.
Moreover, the exhaust gas temperature is monitored during the regeneration process.
Effects of faults
In the event of a fault, the PCM reverts to a substitute value.
The substitute value is calculated on the basis of:
โข Coolant temperature,
โข Engine speed,
โข Engine load.
Diagnosis
The exhaust gas temperature sensor verifies that the incoming signal is within the specified limits and checks it for plausibility.
In the event of a fault, the exhaust gas emissions are not affected and this is therefore a non MIL active component.
Possible diagnostic trouble codes: P0425, P0426, P0427, P0428.