CDI idle speed control, function - GF07.16-P-3002IC
ENGINE 647.961 in MODEL 211
ENGINE 648.960 in MODEL 220
ENGINE 648.961 in MODEL 211
Idle speed control keeps the idle speed constant, even during load requests, such as drive position selected (with automatic transmission) or when coolant compressor is switched on (A9).
For this purpose, the CDI control unit calculates the target engine speed and performs a target-actual value comparison. Accordingly, the CDI control unit controls the rail pressure via the quantity control valve and the pressure regulator valve and controls injection timing via the fuel injectors.
Rail pressure and injection time determine the quantity of fuel injected.
The following input signals are evaluated by the CDI control unit for idle speed control:
- Engine speed
- Coolant temperature
- Accelerator pedal position
- Rail pressure
| Component description for the fuel injectors | Y76 | GF07.03-P-6120IC | |
| Component description for the crankshaft position sensor | L5 | GF07.04-P-6010IC | |
| Component description for the coolant temperature sensor | B11/4 | GF07.04-P-6040IC | |
| Component description for the rail pressure sensor | B4/6 | GF07.04-P-6210IC | |
| Component description for the quantity control valve | Y94 | GF07.05-P-6010IC | |
| Component description for the pressure regulator valve | Y74 | GF07.05-P-6020IC | |
| Component description for the CDI control unit | N3/9 | GF07.16-P-6000IC | |
| Component description for the accelerator pedal sensor | B37 | GF30.20-P-2010IC |