Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
CDI zero quantity calibration function - GF07.16-P-3009P
ENGINES 642 in MODEL 219.3, 209.3, 211.0/2, 209.4, 211.6
ENGINES 642 in MODEL 461.3
ENGINES 642.9 in MODEL 463.3
ENGINES 642 in MODEL 221.0, 203.0, 164.1, 203.2, 251.0/1, 164.8, 221.1 up to model year 2008/YoM 07
Due to modified friction when the fuel injectors are opened and closed (Y76) (wear), a longer or shorter actuation results via the runtime. Zero quantity calibration is carried out in overrun mode, when the lowest fuel quantity is injected. In this phase the deviating amount (drift) is detected by the CDI control unit (N3/9) (actual value). The specified value is stored in the CDI control unit. The corrected actuation period is calculated from the difference by the CDI control unit.
The CDI control unit analyzes information from the following sensors to do this:
- O2 sensor upstream of the catalytic converter (G3/2), (except model 211.022/222 with code (498) Japan version) the drift is adjusted, the residual oxygen content in the exhaust reduces
- O2 sensor downstream of the catalytic converter (G3/1), (model 211.022/222 with code (498) Japan version) the drift is adjusted, the residual oxygen content in the exhaust reduces
- Crankshaft Hall sensor (B70), if the drift is adjusted, the engine speed increases
| Component description for fuel injector | Y76 | GF07.03-P-6120P |
| Component description for 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 crankshaft Hall sensor | B70 | GF07.04-P-6220P |
| Component description for O2 sensor | Model 164, 463 G3/2 |
GF07.04-P-6100GZ |
| Model 203, 209 G3/2 |
GF07.04-P-6100P | |
| Engine 642.920 in model 211.020/220/620, 219.322 Engine 642.921 in model 211.084/089/284/289 Engine 642.920 in model 211.022 except code (494) USA version Engine 642.920 in model 211.022/222 except code (498) Japan version G3/2 |
GF07.04-P-6100T | |
| Engine 642.920 in model 211.022 with code (494) USA version Engine 642.920 in model 211.024 G3/1, G3/2 |
GF07.04-P-6100TU | |
| Engine 642.920 in model 211.022/222 with code (498) Japan version G3/1 |
GF07.04-P-6100TJ | |
| Model 221 G3/2 |
GF07.04-P-6100SX | |
| Model 251 G3/2 |
GF07.04-P-6100RT | |
| Model 461 G3/2 |
GF07.04-P-6100GX |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.