| Working on the fuel system |
| When working on the fuel system note the following warnings: |
WARNING | The fuel system operates at extremely high pressure. This can cause injury. |
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| The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. |
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| Wrap a clean cloth around the connection and carefully loosen the connection to allow the residual pressure to dissipate. |
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| Procedure before opening high-pressure section of injection system → Rep. gr.24. |
WARNING | Escaping fuel can cause a fire risk. |
| The power supply for the fuel system pressurisation pump -G6- must be disconnected before opening the fuel system, since -G6- will be activated briefly when the driver's door is opened with the battery still connected. |
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| Observe the following to prevent injuries to persons and damage to the injection and ignition system: |
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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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| Always switch off ignition before washing engine. |
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| Entries are stored in event memory of engine control unit if electrical connectors were unplugged and 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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