For safety reasons, the APP sensor is designed as a inductive double sensor. In this system, the signal from APP sensor 1 is transmitted directly as a pulse width modulated signal to the PCM. The APP sensor 2 signal is transmitted as an analog signal to the instrument cluster. In the instrument cluster the APP… Read More »
1 Wheel speed sensors 2 ABS module 3 PCM The vehicle speed signal is determined by the Bosch common rail system via the wheel speed sensors of the ABS. The signal from the wheel speed sensors is transmitted via the CAN communication bus. The PCM calculates the vehicle speed from this. For the calculation of… Read More »
1 MAF sensor The MAF sensor measures the air mass drawn into the engine. The MAF signal has an effect on the injected quantity and the injection timing. Furthermore, the MAF signal is used to control the exhaust gas recirculation (closed control loop). There is an IAT sensor integrated into the MAF sensor. The IAT… Read More »
The ECT sensor is located in the small coolant circuit of the engine and measures the coolant temperature. This sensor is a temperature-sensitive resistance element with an NTC (Negative Temperature Coefficient). The voltage value supplied by the ECT sensor is assigned to a corresponding temperature value by the PCM. The ECT is used for the… Read More »
Function The BARO sensor is located in the PCM and measures the ambient air pressure. With increasing geographical altitude (for example when driving up a hill) the air density and therefore the air resistance decreases. This has an effect on the engine cylinder charge and the turbocharger speed. To avoid damage to the turbocharger and… Read More »
The illustration shows the MAP sensor in a vehicle with a diesel particulate filter system The MAP sensor is located in the air intake tract downstream of the intercooler. The MAP sensor has the following functions: • Measuring the current boost pressure, • Calculating the air density for adapting the injected quantity and the injection… Read More »
The CMP signal is required by the PCM to activate the individual fuel injectors according to the injection sequence. The CMP sensor works on the Hall principle. The square-wave signal is used to identify cylinder 1, in conjunction with the CKP signal. Effects of faults When the engine is started, the synchronization between the CKP… Read More »
CKP sensor installation position 1 Crankshaft vibration damper 2 CKP sensor The CKP signal is a prerequisite for the calculation of injected quantity and injection timing. The CKP sensor works according to the Hall principle and scans a magnetic disc on the crankshaft timing pulley. The CKP signal is used: • to determine engine speed,… Read More »
1 Battery junction box 2 Sheathed-type glow plug control module 3 Sheathed-type glow plug 1 4 Sheathed-type glow plug 2 5 Sheathed-type glow plug 3 6 Sheathed-type glow plug 4 7 PCM 8 Instrument cluster with glow plug warning indicator The glow plug system of the Siemens common rail system is designed so that each… Read More »
1 MAP sensor 2 Fuel pressure sensor 3 Combined IAT sensor and MAF sensor 4 IAT sensor (only with diesel particulate filter system) 5 Fuel temperature sensor 6 ECT sensor 7 CMP sensor 8 CKP sensor 9 Stoplamp switch 10 APP sensor 11 BPP switch 12 DC motor for the EGR valve with an integrated… Read More »