A4 Cabriolet Mk2
|
WARNING
| 1 - | Fuel metering valve -N290- |
| q | Do not unscrew |
| 2 - | High-pressure fuel pump |
| q | With gear-type fuel system pressurisation pump |
| q | High-pressure pump generates fuel pressure up to 1600 bar |
| q | Gear-type fuel system pressurisation pump generates fuel pressure between 4 and 5 bar |
| q | Exploded view: vehicles up to 09.2005 → Chapter; vehicles from 09.2005 onwards → Chapter |
| q | Removing and installing: vehicles up to 09.2005 → Chapter; vehicles from 09.2005 onwards → Chapter |
| 3 - | Rail element (high-pressure reservoir) |
| q | Cylinder bank 1 |
| 4 - | Fuel pressure regulating valve -N276- |
| q | On cylinder bank 1 |
| q | Cannot be re-installed |
| q | Removing and installing → Chapter |
| 5 - | Fuel pressure sender -G247- |
| q | On cylinder bank 2 |
| q | Removing and installing → Chapter |
| 6 - | Rail element (high-pressure reservoir) |
| q | For cylinder bank 2 |
| 7 - | Injectors (piezo injectors) |
| q | Injectors 1 ... 6 |
| q | Removing and installing → Chapter |
| 8 - | Fuel return lines (from injectors) |
| q | The fuel return lines must not be dismantled; if necessary they must be renewed complete with pressure retention valve. |
| q | After replacement, engine must be run at idling speed for approx. 2 minutes to bleed fuel system. Then check fuel return lines for leaks. |
| 9 - | Pressure retention valve |
| q | The pressure retention valve maintains a residual pressure of approx. 10 bar in the return lines. |
| q | This residual pressure is required for the control function of the piezo injectors. |
| q | The pressure retention valve may only be renewed together with the fuel return lines. |
| q | After replacement, engine must be run at idling speed for approx. 2 minutes to bleed fuel system |
| q | Checking pressure retention valve → Chapter |
| 10 - | Fuel system pressurisation pump -G6- |
| q | Pressure from fuel system pressurisation pump approx. 1 bar |
| 11 - | Fuel filter |
| q | Exploded view - fuel filter → Rep. gr.20 |
| q | Renewing fuel filter → Rep. gr.20 |
