| Safety precautions when working on the ignition system |
| To prevent injuries to persons and/or damage to the fuel injection and ignition system, note the following: |
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| Persons wearing a cardiac pacemaker must at all times maintain a safe distance from high-voltage components such as the ignition system and gas-discharge headlights. |
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| Always switch off the ignition before connecting or disconnecting electrical wiring for the injection or ignition system or tester cables. |
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| For safety reasons, the battery must be disconnected before opening the fuel system to prevent the fuel pump from being activated by the contact switch on the driver's door. |
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| Do not open any fuel line connections while the engine is running. |
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| Always switch off ignition before washing engine. |
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| If you want to crank the engine at starting speed without actually starting the engine (e.g. compression test), first unplug the electrical connectors from the ignition coils → Chapter. |
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| Entries are stored in the event memory of the engine control unit if electrical connectors were unplugged and the engine was started: „Generate readiness code“ in „Guided Functions“ → Vehicle diagnostic tester. |
Caution | To prevent irreparable damage to the electronic components when disconnecting the battery: |
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| Observe notes on procedure for disconnecting the battery. |
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| Always switch off the ignition before disconnecting the battery. |
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