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Home >> Volkswagen >> 2009 >> Golf Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 193 (2.0L - Diesel Fuel Injection - Engine Code(S): CBEA & CJAA (Sedan) (A5 Platform)) >> 23 Diesel Fuel Injection >> Description And Operation >> System Overview

System Overview

WARNING: This page is about a different car, the 2010 Volkswagen Jetta and 2009 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • Follow the safety precautions when working on the diesel direct injection system. Refer to SAFETY PRECAUTIONS .
  • Observe the rules for cleanliness CLEAN WORKING CONDITIONS .
  • If fuel system components between the fuel tank and high pressure fuel pump were removed or replaced, the fuel system must be filled in order to bleed it. Refer to FUEL SYSTEM, FILLING AND BLEEDING . (Never allow the high pressure pump to run dry).

Always follow these instructions before and during work.

Fig 1: Identifying Fuel System Overview
GWWM23-0209Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Fuel Metering Valve -N290- 
    • Do not open!
  2. High Pressure Fuel Pump 
  3. Fuel Pressure Sensor -G247- 
  4. Fuel Rail 
  5. Fuel Pressure Regulator Valve -N276- 
  6. Fuel Injector 
    • Cylinder 1 fuel injector -N30-
    • Cylinder 2 fuel injector -N31-
    • Cylinder 3 fuel injector -N32-
    • Cylinder 4 fuel injector -N33-
    • Removing and installing, refer to FUEL INJECTOR .
  7. Fuel Return Line 
    • The fuel return line must be routed correctly. They may be replaced only with the pressure retention valve.
    • Run the engine at idle for approximately two minutes after replacing, in order to bleed the fuel system and then check the fuel return lines for leaks.
  8. Pressure Retention Valve 
    • The valve always maintains a residual pressure (control quantity) of approximately 10 bar in the fuel return lines.
    • The fuel injectors require this control quantity to function correctly.
    • The pressure retention valve must be replaced completely with the fuel return line -item 7-.
    • The engine must run at idle for approximately two minutes after replacing to bleed the fuel system.
    • Checking the pressure retention valve in the fuel return line. Refer to PRESSURE RETENTION VALVE IN FUEL RETURN LINE, CHECKING .
  9. Fuel Tank 
    • Overview, refer to one of the following:
      • Jetta from MY 05 through 10, Jetta SportWagen (US)/Jetta Wagon (Canada) for MY 09 and Jetta SportWagen (US)/Golf Wagon (Canada) from MY 10, refer to FUEL TANK OVERVIEW .
  10. Fuel Filter 
  11. Auxiliary Fuel Pump -V393- 
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