Volkswagen Golf Variant / Jetta. Manual - part 431

 

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Volkswagen Golf Variant / Jetta. Manual - part 431

 

 

System Overview

⇒ “3.2.1 System Overview”, page 307

3.2.1

System Overview

DANGER!

♦ Follow the safety precautions when working on the diesel

direct fuel injection system. Refer to

⇒ “1 Safety Precautions when Working on Diesel Direct

Fuel Injection System”, page 303

 .

♦ Pay attention to the guidelines for clean working condi‐

tions. Refer to

⇒ “2 Guidelines for Clean Working Conditions”,

page 305

 .

♦ 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

⇒ “3.9 Fuel System, Filling/Bleeding”, page 328

 . (Never

let the high pressure pump run dry).

Always pay attention to these instructions before and during

work.

3. Diesel Direct Injection System    

307

❑ Do not open

2 - High Pressure Fuel Pump

❑ Removing and instal‐

ling. Refer to

⇒ “3.8 High Pressure

Fuel Pump, Removing

and Installing”,

page 325

 .

❑ The fuel system “must”

always be filled after re‐

placing (never run dry)

(refer to

⇒ “3.9 Fuel System, Fill‐

ing/Bleeding”,

page 328

 ), Fuel Sys‐

tem, Filling.

3 - Fuel Pressure Sensor -

G247-

❑ Removing and instal‐

ling. Refer to

⇒ “3.7  Fuel Pressure

Sensor G247 , Remov‐

ing and Installing”, page

323

 .

4 - Rail Element (High Pres‐

sure Reservoir)
5 - Fuel Pressure Regulator

Valve - N276- , 80 Nm

❑ Removing and instal‐

ling. Refer to

⇒ “3.6  Fuel Pressure

Regulator Valve N276 ,

Removing and Instal‐

ling”, page 322

 .

6 - Fuel Injector (Piezo Injec‐

tors)

❑ 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

⇒ “3.4 Fuel Injector (Piezo Injector), Removing and Installing”, page 315

 .

7 - Fuel Return Lines

❑ The fuel return line must be routed correctly. They may be replaced only with the pressure retaining

valve.

❑ Run the engine at idle for approximately two minutes after replacing to bleed the fuel system and then

check the fuel return lines for leaks.

8 - Pressure Retaining Valve

❑ The check valve always maintains a residual pressure (control quantity) of approximately 10 bar (145.03

psi) in the fuel return lines.

❑ The fuel injectors require this control quantity to function correctly.
❑ The pressure retaining valve must be replaced completely with the fuel return lines -item 7-

⇒ Item 7 (page 308)

 .

❑ The engine must run at idle for approximately two minutes after replacing to bleed the fuel system.
❑ Pressure Retention Valve in Fuel Return Line, Checking. Refer to

⇒ “3.11 Pressure Retaining Valve in Fuel Return, Checking”, page 330

 .

308

❑ Overview - Fuel Tank, All Vehicles Except Jetta from MY 2011. Refer to

⇒ “4.2 Overview - Fuel Tank, All Vehicles Except Jetta from MY 2011”, page 231

❑ Overview - Fuel Tank, Jetta from MY 2011 Only. Refer to

⇒ “4.3 Overview - Fuel Tank, Jetta from MY 2011 Only”, page 233

10 - Fuel Filter

❑ Overview - Fuel Filter. Refer to 

⇒ “6.2 Overview - Fuel Filter”, page 249

 .

11 - Auxiliary Fuel Pump - V393-

❑ Removing and installing. Refer to

⇒ “6.6  Auxiliary Fuel Pump V393 (Inline Fuel Pump), Removing and Installing”, page 259

 .

3.2.2

System Overview - Engine Codes

CBDA, CBDB, CEGA

DANGER!

♦ Follow the safety precautions when working on the diesel

direct fuel injection system. Refer to

⇒ “1 Safety Precautions when Working on Diesel Direct

Fuel Injection System”, page 303

 .

♦ Pay attention to the guidelines for clean working condi‐

tions. Refer to

⇒ “2 Guidelines for Clean Working Conditions”,

page 305

 .

♦ 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

⇒ “3.9 Fuel System, Filling/Bleeding”, page 328

 . (Never

let the high pressure pump run dry).

Always pay attention to these instructions before and during

work.

3. Diesel Direct Injection System    

309

❑ With the Transfer Fuel

Pump - G6-

2 - Fuel Filter

❑ with pre-warm valve
❑ Overview - Fuel Filter.

Refer to

⇒ “6.2 Overview - Fuel

Filter”, page 249

 .

❑ Removing and instal‐

ling. Refer to

⇒ “6.3 Fuel Filter, Re‐

moving and Installing”,

page 251

 .

3 - Auxiliary Fuel Pump - V393-
Removing and installing. Refer

to

⇒ “6.6  Auxiliary Fuel Pump

V393 (Inline Fuel Pump), Re‐

moving and Installing”,

page 259

 .

4 - Filter
5 - Fuel Temperature Sensor -

G81-
6 - High Pressure Pump

❑ After replacing, the fuel

tank must be filled (nev‐

er run dry). Refer to

⇒ “3.9 Fuel System, Fill‐

ing/Bleeding”,

page 328

 .

❑ Removing and instal‐

ling. Refer to

⇒ “3.8 High Pressure

Fuel Pump, Removing and Installing”, page 325

 .

7 - Fuel Metering Valve - N290-

❑ Must not be removed

8 - Fuel Pressure Regulator Valve - N276-

❑ Removing and installing. Refer to

⇒ “3.6  Fuel Pressure Regulator Valve N276 , Removing and Installing”, page 322

 .

9 - High Pressure Reservoir (Rail)
10 - Fuel Pressure Sensor - G247-

❑ Removing and installing. Refer to

⇒ “3.7  Fuel Pressure Sensor G247 , Removing and Installing”, page 323

 .

11 - Pressure Retaining Valve

❑ The pressure retaining valve always maintains a residual pressure (control quantity) of approximately 10

bar (145.03 psi) in the fuel return lines.

❑ The Piezo injectors need this control quantity for their function.
❑ The pressure retaining valve can be replaced only with the complete fuel return lines.
❑ The engine must run at idle for approximately two minutes after replacing to bleed the fuel system.
❑ Check the pressure retaining valve. Refer to

⇒ “3.11 Pressure Retaining Valve in Fuel Return, Checking”, page 330

 .

12 - Fuel Injector (Piezo Injectors)

❑ Cylinder 1 Fuel Injector - N30-

310

 

 

 

 

 

 

 

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