| 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 → Chapter. |
| 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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| Faults are stored in engine control unit if electrical connectors have been unplugged: |
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| With ignition switched off, connect vehicle diagnostic, testing and information system -VAS 5051B-. |
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| Start „Guided Functions“ mode. |
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| Generate readiness code in engine control unit. |
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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| When working on the cooling system note the following warnings: |
WARNING | Hot steam/hot coolant can escape - risk of scalding. |
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| The cooling system is under pressure when the engine is hot. |
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| To allow pressure to dissipate, cover filler cap on coolant expansion tank with cloth and open carefully. |
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| Note the following if testers and measuring instruments have to be used during a road test: |
WARNING | Accidents can be caused if the driver is distracted by test equipment while road-testing, or if test equipment is not properly secured. |
| Injuries can also be caused if the passenger's airbag is triggered in a collision. |
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| The use of test equipment while driving causes distraction. |
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| There is an increased risk of injury if test equipment is not secured. |
| Test equipment must always be secured on the rear seat with a strap and operated from the rear seat by a second person. |
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