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Home >> Volkswagen >> 2005 >> Jetta TDI, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (2.0L - Fuel Supply - Engine Code(S): CBFA & CCTA (A5 Platform)) >> 20 Fuel Supply >> General Information >> High Side Fuel Pressure, Releasing

High Side Fuel Pressure, Releasing

WARNING: This page is about a different car, the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2009 Volkswagen GLI, 2008 Volkswagen Jetta, and 2008 Volkswagen GLI. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools And Workshop Equipment Required 

WARNING:

The fuel injection system is divided into a high pressure side (maximum approximately 120 bar) and a low pressure side (approximately 6 bar):

  • Before opening the high pressure side, for example, removing the high pressure pump, fuel rail, fuel injectors, fuel pipes or fuel pressure sensor, the high pressure side pressure must be reduced to a residual pressure of approximately 6 bar. The procedure for this is as follows:

-- Using the assembly Tool T10118, disconnect the electrical connector -1- from fuel pressure regulator valve -N276-.

Fig 1: Identifying Connector To Fuel Pressure Regulator Valve
GWWA24-10449Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Allow the engine to idle approximately 10 seconds.

NOTE:

When the fuel pressure regulator valve electrical connector is disconnected during idle, the high side pressure decreases to approximately 6 bar.

After the high pressure has been released, the high pressure system must be opened, otherwise the pressure increases again due to the warming of the fuel.

-- Turn off the ignition.

WARNING:

The fuel lines are pressurized!

  • For safety reasons, interrupt the current supply to the fuel pump, refer to SAFETY PRECAUTIONS  before opening the fuel system because the fuel pump is activated by the driver door contact switch.
  • Always wear protective eyewear and protective clothing to prevent injuries and fuel from coming in contact with your skin.
  • Before opening the high pressure side, place a cloth around the connection.

-- Place a clean cloth around the connection point and carefully open to release the residual pressure of approximately 6 bar. Leaking fuel must be absorbed.

NOTE:

By disconnecting the connections, Diagnostic Trouble Codes (DTCs) are stored to memory. After assembling, check the fault memory and erase, if necessary.

-- Check the Engine Control Module (ECM) DTC memory and erase any entries.

NOTE:

If the DTC memory was erased, the readiness code must be generated again.

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