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Diesel direct injection system The diesel direct injection system control unit is equipped with a fault memory. Read fault memory before and after making repairs or adjustments. ⇒ page 166 Rules for cleanliness ⇒ page 167 . Assembly overview - unit injector ⇒ page 167 Removing and installing unit injector ⇒ page 169 Adjusting non-contact gap of unit injectors ⇒ page 171 Removing and installing O-rings for unit injector ⇒ page 172 Repairing intake manifold flap ⇒ page 174 Assembly overview - air filter ⇒ page 177 . 1.1 Safety precautions WARNING When doing any repair work, especially in the engine compart‐ ment, pay attention to the following due to the cramped condi‐ tions: ♦ Route all the various lines (e.g. for fuel, hydraulics, acti‐ vated charcoal filter system, coolant and refrigerant, brake fluid and vacuum) and electrical wiring in their original po‐ sitions. ♦ Ensure that there is sufficient clearance to all moving or hot components. Observe following if test and measuring instruments are required during a road test: and operated by a second person from this location. ♦ If test and measuring instruments are operated from front pas‐ senger seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered. To prevent injuries to persons and/or destruction of the injection and glow plug system, the following must be noted: connecting injection or glow plug system wiring or tester ca‐ bles. ♦ If the engine is to be turned at starter speed, without starting, e.g. when checking compressions, disconnect unit injector connector on cylinder head. ♦ Before disconnecting battery, obtain radio code for radios with anti-theft coding. ♦ Disconnecting and connecting the battery must only be done with the ignition switched off, as otherwise the control unit for diesel direction injection system could become damaged. 4-cylinder diesel engine (1.9 l engine) - Edition 01.2009 166 Rep. Gr.23 - Mixture preparation - injection
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