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.
2009 Mercedes Benz E320FACTORY OEM SERVICE PROCEDURE
CDI idle speed, function - GF07.16-P-2002P
ENGINES 642.9 in MODEL 164.1/8, 203.0/2, 204.0/2, 221.0/1, 251.0/1 up to model year 2008/YoM 07
ENGINES 642.8/9 in MODEL 461.3
ENGINES 642.9 in MODEL 463.3
ENGINES 642.9 in MODEL 209.3/4, 211.0/2/6, 219.3
The following are some of the functions that are active when the engine is on idle:
- Fuel supply, to provide the correct quantity of fuel in the current operating state
- Preinjection, to improve the exhaust emission values and reduce noise emissions
- Main injection: The main quantity calculated by the CDI control unit (N3/9) and supplied to the individual cylinders
- Idle speed control, to keep idle speed constant while taking account of the different variables
- Quantity regulation: The required injection quantity for idle is calculated and regulated by the CDI control unit, taking account of the different variables
- Shutoff control, to stop the engine when there is a "circuit 15 OFF" status
- Antiboil protection, to protect the engine from overheating
- Smooth running control, to ensure smooth engine operation
- Exhaust gas cleaning, to reduce exhaust emissions
- Intake port shutoff (EKAS), to improve the combustion process (except model 461)
- Preheating, to assist combustion and improve the exhaust emission values
- Maximum heating combustion: (from 1.6.07) on model 221, more engine heat is conducted into the coolant using a new combustion strategy. This improves the heating in the vehicle interior. For vehicles (not with code (228) stationary heater), this process replaces the stationary heater or heater booster (A6).
| Electrical function schematic for common rail diesel injection (CDI), idle | Model 204 | PE07.16-P-2757-99FAB | |
| CDI fuel supply, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-2006P | |
| Model 204.0/2 | GF07.16-P-2006CO | ||
| CDI preinjection, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-2008P | |
| Model 204.0/2 | GF07.16-P-2008CO | ||
| CDI main injection, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-2009P | |
| Model 204.0/2 | GF07.16-P-2009CO | ||
| CDI fuel low pressure circuit, function | Model 203, 209, 211, 219, 221 | GF07.16-P-3001P | |
| Model 164, 251, 461.3, 463.3 | GF07.16-P-3001GZ | ||
| Model 204.0/2 | GF07.16-P-3001CO | ||
| CDI idle speed control, function | Model 164, 203, 209, 211, 219, 251, 461.3, 463.3 | GF07.16-P-3002P | |
| Model 221 | GF07.16-P-3002SX | ||
| Model 204.0/2 | GF07.16-P-3002CO | ||
| CDI quantity control, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-3004P | |
| Model 204.0/2 | GF07.16-P-3004CO | ||
| CDI high pressure circuit, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-3012P | |
| Model 204.0/2 | GF07.16-P-3012CO | ||
| CDI engine stop control, function | Model 164, 203, 209, 211, 219, 251, 461.3, 463.3 | GF07.16-P-3013P | |
| Model 221 | GF07.16-P-3013SX | ||
| Model 204.0/2 | GF07.16-P-3013CO | ||
| CDI antiboil protection function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-3016P | |
| Model 204.0/2 | GF07.16-P-3016CO | ||
| CDI smooth running control, function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 461.3, 463.3 | GF07.16-P-3018P | |
| Model 204.0/2 | GF07.16-P-3018CO | ||
| Emission control function | Model 164.1/8, 203.0/2, 204.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, except (474) Particulate filter Model 461.3 up to model year 2010/YoM 09 except code (474) Particulate filter |
GF14.00-P-3000P | |
| Engine 642 in model 164.1/8, 203.0/2, 209.3/4, 221.0/1, 251.0/1, 461.3, 463.3 with code (474) Particulate filter Engine 642.920 in model 211.020/220/222/620, 219.322 with code (474) particulate filter Engine 642.921 in model 211.084/089/284/289 with code (474) particulate filter Engine 642.920 in model 211.022 except code (494) USA version with code (474) particulate filter Engine 642.920 in model 211.022/222 with code (498) Japan version |
GF14.00-P-3000PX | ||
| Engine 642.920 in model 211.022 with code (494) USA version Engine 642.920 in model 211.024 |
GF14.00-P-3000PXU | ||
| Model 204 0/2 with code (474) particulate filter | GF14.00-P-3000CO | ||
| Intake port shutoff function | Model 164.1/8, 203.0/2, 209.3/4, 211.0/2/6, 219.3, 221.0/1, 251.0/1, 463 | GF14.20-P-3009P | |
| Model 204.0/2 | GF14.20-P-3009CO | ||
| CDI glow function | Model 164, 203, 209, 211, 219, 251, 461.3, 463.3 | GF15.20-P-3004P | |
| Model 221 | GF15.20-P-3004SX | ||
| Model 204.0/2 | GF15.20-P-3004CO |
Factory Service Tools
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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.