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.
Ignition Off, Function - GF07.10-P-1002KJ
ENGINE 281.910 in MODEL 453.0/3/4
Function requirements for ignition OFF, general points
- Circuit 87 (Engine management ON)
- Terminal 15
Ignition OFF, general points
With the ignition OFF, first the engine and then the engine management are switched off in the ME-SFI [ME] control unit (N3/10).
Function sequence for ignition OFF
For ignition OFF the circuit 15 switched off in ignition lock (S2).
If the ME-SFI [ME] control unit receives the signal "circuit 15 OFF" over the FIR fuse and relay module (F2), the engine switched off by switching off the fuel pump with fill level sensor and temperature sensor (T1/3), of the cylinder 1 injection valve (M3/1) to cylinder 3 injection valve (Y62/3) and the cylinder 1 ignition coil (Y62/1) to cylinder 3 ignition coil (T1/3) and the computer run-on is started.
The "circuit 31" ground connection is made from the on-board electrical system battery (G1) over the on-board electrical system battery ground point (W10) and over a number of ground lines to the ground point of the internal combustion engine ground point 2 (W11/16).
When the ignition is OFF, the ME-SFI [ME] control unit is supplied with power from the on-board electrical system battery via "circuit 30 fused".
| Electrical function schematic for ignition OFF | PE07.10-P-2702-97BBA | ||
| Overview of system components motor electronics (ME-SFI) fuel injection and ignition system | GF07.61-P-9997KJ |
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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.
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