| General notes on injection |
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| The engine control unit -J623- is equipped with self-diagnosis. Before carrying out repairs and fault finding, read fault memory. Also the vacuum hoses and connections must be checked (unmetered air). |
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| For trouble-free operation of electrical components, a voltage of at least 11.5 V is necessary. |
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| Do not use sealants containing silicone. Particles of silicone drawn into the engine will not be burnt in the engine and damage the Lambda probe. |
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| Vehicles with an airbag are fitted with a crash fuel shut-off. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay. The system also improves the starting characteristics of the engine. When door is opened, the fuel pump is activated for 2 seconds to build up pressure in the fuel system. |
| Assembly overview - parts of injection system → Chapter |
| Assembly overview - intake manifold → Chapter. |
| Assembly overview - fuel rail with injectors → Chapter. |
| Removing and installing air filter → Chapter. |
| Cleaning throttle valve module -J338- → Chapter. |
| Check non-return valve for crankcase breather → Chapter |
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