WARNING | t
| Always read rules for cleanliness and instructions for working on fuel system → Chapter. |
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| Follow these instructions and rules for cleanliness before starting work and while working on the fuel system. |
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| Erase event memory of engine control unit. |
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| Clean all connections (with commercial cleaning solution or similar) before removing. |
Note | t
| Make sure all parts are clean; no dirt must be allowed to enter the fuel system. |
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| Check all cylinders in turn. |
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| Dry all components after cleaning. |
| Start with cylinder No. 1. |
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| Unscrew union nut at fuel rail for cylinder 1 and also loosen union nut on injector slightly using socket -T40055-. Seal off open connection on injector pipe. |
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| Plug open connection using plug -T40204-. |
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| The electrical connector of the relevant injector must remain connected. |
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| Erase all entries in the event memory. |
Note | t
| The fault „positive control deviation“ should no longer be indicated when the defective injector has been located. |
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| Other fault messages may possibly be stored in the memory. These result from previous steps and can be disregarded. |
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| Interrogate event memory after road-testing vehicle. If a fault relating to „positive control deviation“ is still being indicated, repeat the above steps for all fuel rail connections until the fault is no longer indicated after the road test. |
| Observe all instructions for connecting injector pipes. |
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| Lubricate threads of union nuts with fuel. |
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| Hand-tighten union nuts on high-pressure pipes. Make sure that connections are not under tension. |
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