CDI limiting maximum engine speed, function - GF07.16-P-3007P
ENGINE 642 in MODEL 164.1 /8, 203.0 /2, 209.3 /4, 211.0 /2 /6, 219.3, 221.0 /1, 251.0 /1
ENGINE 642 in MODEL 463.3
ENGINE 642 in MODEL 461.3
The maximum engine speed limitation is used to restrict the engine speed to approx. 4500 RPM. This counteracts mechanical damage to the engine caused by over-revving. To do this the CDI control unit (N3/9) reads in the crankshaft Hall sensor (B70) and uses its signal to determine the motor speed. Above an engine speed of around 4500 RPM, the CDI control unit interrupts actuation of the fuel injectors (Y76) and reduces the fuel pressure in the rail via the quantity control valve (Y94) and the pressure control valve (Y74).
If the engine speed falls back down to under around 4500 RPM, then the CDI control unit re-actuates the fuel injectors and increases the fuel pressure in the rail via the quantity control valve and the pressure control valve.
| Component description for fuel injectors | Y76 | GF07.03-P-6120P | |
| Component description for the crankshaft Hall sensor | B70 | GF07.04-P-6220P | |
| Component description for the rail pressure sensor | B4/6 | GF07.04-P-6210P | |
| Component description for the quantity control valve | Y94 | GF07.05-P-6010P | |
| Component description for the pressure regulator valve | Y74 | GF07.05-P-6020P | |
| Component description for the CDI control unit | Model 203, 209 N3/9 |
GF07.16-P-6000P | |
| Model 211, 219 N3/9 |
GF07.16-P-6000T | ||
| Model 164, 463 N3/9 |
GF07.16-P-6000GZ | ||
| Model 221 N3/9 |
GF07.16-P-6000SX | ||
| Model 251 N3/9 |
GF07.16-P-6000RT | ||
| Model 461 N3/9 |
GF07.16-P-6000GX | ||
| Component description for the accelerator pedal sensor | Model 203, 209, 211, 219 B37 |
GF30.20-P-2010P | |
| Model 164, 463 B37 |
GF30.20-P-2010GZ | ||
| Model 221 B37 |
GF30.20-P-2010SX | ||
| Model 251 B37 |
GF30.20-P-2010RT |