The figure depicts the two-module system; with the single-module system the IDM is integrated in the PCM. A Fuel injection line B High pressure line C Fuel return from pump to tank/filter D Fuel feed E Leak-off pipe F Fuel return to tank 1 Fuel injector 2 Fuel rail (common rail) 3 High pressure pump… Read More »
Function The intake manifold flap position sensor detects the exact angular position of the intake manifold flap during the active regeneration process. Effects of faults The effects are similar to a failure of the intake manifold flap solenoid valve (see relevant section in this lesson). Diagnosis The monitoring system checks: • for short circuit to… Read More »
Function A high temperature (approx. 600 °C) is needed to burn off the diesel particulates trapped in the diesel particulate filter. This temperature, however, is not attained in all of the engine’s operating conditions. In the lower part load range, the intake manifold flap is partly closed and thus assists in increasing the temperature. The… Read More »
1 MAP sensor 2 Intake manifold flap vacuum unit 3 Intake manifold flap position sensor Function NOTE: In vehicles with a coated diesel particulate filter, a MAP sensor is installed on the intake manifold flap housing. The MAPT (Manifold Absolute Pressure And Temperature) sensor which may possibly be installed only fulfils the function of the… Read More »
NOTE: After replacing the diesel particulate filter differential pressure sensor it is necessary to reset the parameters for the diesel particulate filter differential pressure sensor. In this regard, always refer to the instructions in the current Service Literature. The diesel particulate filter differential pressure sensor measures the current pressure differential upstream and downstream of the… Read More »
The exhaust gas temperature required for burning off the diesel particulates of at least 550 … 600 °C is detected by the exhaust gas temperature sensors and transmitted to the PCM. The exhaust gas temperature input parameters are used for calculation purposes by the PCM, which also takes other parameters into account. Depending on the… Read More »
1 Catalytic converter exhaust gas temperature sensor 2 Diesel particulate filter exhaust gas temperature sensor 3 Diesel particulate filter differential pressure sensor 4 MAP sensor 5 Intake manifold flap position sensor 6 PCM 7 CAN 8 DLC 9 Intake manifold flap solenoid valve 10 Fuel injector Service instructions The coated diesel particulate filter is built… Read More »
1 Oxidation catalytic converter 2 Catalytic converter exhaust gas temperature sensor 3 Flexible pipe 4 Diesel particulate filter exhaust gas temperature sensor 5 Diesel particulate filter heat shield 6 Diesel particulate filter 7 Rear pipe – diesel particulate filter differential pressure sensor 8 Front pipe – diesel particulate filter differential pressure sensor NOTE: After replacing… Read More »
The common rail engine management system has a triple software monitoring system in the IDM, which brings the engine to a standstill in the event of a critical software error in the system. This triple monitoring system works as follows: • Deletes all injection operations still present in the module, • Closes the fuel metering… Read More »
1 PCM connector 2 Microprocessor 3 Operating memory (RAM) 4 EEPROM memory 5 PATS 6 Power supply relay 7 Fuse 8 Battery NOTE: DTCs and adaptation data can be deleted electronically with the aid of WDS. NOTE: The PCM has a continuous voltage connection to the battery. This is used, among other things, to activate… Read More »