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 ignition ON, function - GF07.16-P-2000P
ENGINE 642 in MODEL 203.0/2, 221.0/1 up to Model Year 8
ENGINE 642 in MODEL 209.3/4, 211.0/2/6, 219.3
For "circuit 15 ON" the CDI control unit (N3/9) switches on the front SAM control unit with fuse and relay module (N10/1) (models 203, 209, 221) or the driver-side SAM control unit with fuse and relay module (N10/1) (models 211, 219). The CDI control unit supplies the signal for preglowing to the glow time output stage (N14/3) through a serial interface.
The electric fuel pump (M3) is switched on via the rear SAM control unit with fuse and relay module (N10/2) and the fuel pump relay (N10/2kA) (models, 203, 209, 211, 219) or fuel pump relay (N10/2kS) (model 221). If the engine is not started, the fuel pump is switched off again after approx. 3 seconds.
| CDI fuel supply, function | GF07.16-P-2006P |
| CDI preglow function | GF15.20-P-3004P |
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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.