The EGR valve is fitted on the exhaust side of the engine on the cylinder head. The EGR valve comprises the following components: • Servo motor, • Position sensor, • the EGR valve itself. 1 PCM 2 DC motor 3 Servo motor 4 Position sensor NOTE: After the EGR valve is replaced or after the… Read More »
Function The boost pressure control solenoid valve is supplied with vacuum by the vacuum pump. Pulse width modulated signals from the PCM control this vacuum via the boost pressure control solenoid valve. The controlled vacuum acts upon the vacuum unit of the turbocharger. Effects of faults In the event of a fault, boost pressure control… Read More »
1 Solenoid armature 2 Wiring harness connector connection 3 Solenoid valve needle The fuel injectors are each fitted with one solenoid valve. Actuation for fuel metering is carried out by the PCM. The electrical supply of the solenoid valves occurs in several phases: 1. Opening phase, 2. Pickup current phase, 3. Transition to holding current… Read More »
NOTE: When de-energized, the fuel metering valve is completely closed. Additional functions as well as strategies are essentially the same as those of the fuel metering valve of CP3.2
The fuel metering valve regulates the fuel quantity which is fed to the high-pressure chambers of the high-pressure pump depending on the fuel pressure in the fuel rail. As a result, the quantity of fuel that flows back to the fuel tank is kept to a minimum. 1 Coil 2 Wiring harness connector connection 3… Read More »
Function Using the CPP switch, the PCM identifies whether the clutch is engaged or disengaged. The quantity of injected fuel is briefly reduced during actuation of the clutch to avoid engine judder during gearshifts. The CPP switch is located on the pedal box assembly. On vehicles with a speed control system, the CPP switch switches… Read More »
Function The signal of the stop lamp switch influences fuel metering when the brake is applied and a gear is engaged at idle speed. Example: During braking, the PCM receives a signal from the stoplamp switch which results in the fuel quantity for idle control being reduced. This prevents the idle control system from continuing… Read More »
1 PCM 2 Instrument cluster 3 Oil pressure switch The oil pressure in the engine’s oil circuit is monitored via the oil pressure switch. If the oil pressure is incorrect, this is detected by the oil pressure switch, which then transmits a signal to the PCM. In the PCM the signal from the oil pressure… Read More »
The fuel pressure sensor measures the current fuel pressure in the fuel rail very accurately and quickly and delivers a voltage signal to the PCM in accordance with the current pressure level. The fuel pressure sensor operates together with the fuel metering valve on the high-pressure pump in a closed-loop control circuit. The fuel pressure… Read More »
The fuel temperature sensor is located in the fuel return system in a T-piece above the fuel rail. It measures the fuel temperature in the low-pressure system. With the help of this signal, the fuel temperature is continuously monitored to prevent overheating of the injection system. The critical fuel temperature is approx. 90 °C. When… Read More »