Volkswagen Golf / Golf GTI / Golf Variant. Service manual - part 722

– Remove the shear bolt -1- with a screwdriver -2-.
– Remove the protective housing from the Engine Control Mod‐

ule - J623- .

– Release the retainers in direction of -arrow A- and remove the

Engine Control Module - J623- in direction of -arrow B-.

– Unlock and disconnect the connectors from the Engine Con‐

trol Module - J623- .

Installing
Install in reverse order of removal. Note the following:
– Place the Engine Control Module - J623- in the bracket with

the lower edge forward in direction of -arrow A- and locked on

the upper edge.

– Engine Control Module - J623- must be installed again with

protective housing.

– Clean any locking fluid still in the threaded holes for the shear

bolt. Cleaning can be performed with a thread cutter (tap).

– Always use new shear bolts.
– Connect the battery. Refer to ⇒  Electrical Equipment; Rep.

Gr.  27 ; Battery; Battery, Disconnecting and Connecting .

Perform the Following after Installing a New ECM
– Turn on the ignition and select the following menu items on the

Vehicle Diagnostic Tester :

♦

01 - Engine Electronics

♦

Guided Functions

♦

01 - Engine Control Module Replacing

7

High Pressure Pump

⇒ “7.1 Overview - High Pressure Pump”, page 325

 .

⇒ “7.2 High Pressure Pump, Removing and Installing”,

page 328

 .

7.1

Overview - High Pressure Pump

⇒ “7.1.1 Overview - High Pressure Pump, Vehicles without Intake-

Manifold Fuel Injection”, page 325

 .

7.1.1

Overview - High Pressure Pump, Vehi‐

cles without Intake-Manifold Fuel Injec‐

tion

CAUTION

Fuel system is under high pressure.
Risk of injury from fuel spraying out.
– Reducing the fuel high pressure.

1 - Connector

❑ For Fuel Pressure Reg‐

ulator Valve - N276-

2 - High Pressure Pump Bolt

❑ 8 Nm + 90° turn
❑ Replace after removing
❑ Tighten by hand

3 - High Pressure Pump

❑ There is an electric fuel

pump located in the fuel

tank that supplies the

fuel to the mechanical

high pressure pump.

❑ When installing, make

sure that no dirt enters

the fuel system.

❑ The fuel system must be

without pressure, re‐

lease fuel pressure. Re‐

fer to

⇒ “1.2 High Fuel Pres‐

sure, Reducing”,

page 283

 .

❑ Install the fuel lines free

of tension

❑ Inspect the O-ring, and

replace if damaged

❑ With Fuel Pressure

Regulator Valve - N276-

❑ Removing and instal‐

ling. Refer to

⇒ “7.2 High Pressure

Pump, Removing and

Installing”, page 328

 .

4 - O-Ring

❑ Replace if damaged

5 - Roller Tappet

❑ Remains inserted in the vacuum pump after removing the high pressure pump

6 - High Pressure Pump Bolt

❑ 8 Nm + 90° turn
❑ Replace after removing
❑ Tighten by hand

7 - Fuel Supply Line Connection

❑ 30 Nm
❑ Replace after removing
❑ When loosening the high pressure line, secure the connection from turning.

8 - Fuel Supply Line

❑ 27 Nm
❑ For the fuel injector fuel rail
❑ Lubricate the fuel supply line ball with engine oil
❑ Install fuel supply line free of stress

9 - Spring Clamp

❑ Replace if damaged

10 - Fuel Supply Line

❑ Coming from the fuel tank

7.1.2

Overview - High Pressure Pump, Vehi‐

cles with Intake-Manifold Fuel Injection

CAUTION

Fuel system is under high pressure.
Risk of injury from fuel spraying out.
– Reducing the fuel high pressure.

1 - High Pressure Pump Bolts

❑ 20 Nm
❑ Replace after removing
❑ Tighten uniformly

2 - Fuel Pressure Regulator

Valve - N276-
3 - Connector

❑ For Fuel Pressure Reg‐

ulator Valve - N276-

4 - High Pressure Pump

❑ There is an electric fuel

pump located in the fuel

tank that supplies the

fuel to the mechanical

high pressure pump.

❑ When installing, make

sure that no dirt enters

the fuel system.

❑ The fuel system must be

without pressure, re‐

leasing fuel pressure.

Refer to

⇒ “1.2 High Fuel Pres‐

sure, Reducing”,

page 283

❑ Install the fuel lines free

of tension

❑ Inspect the O-ring, and

replace if damaged

❑ Removing and instal‐

ling. Refer to

⇒ “7.2 High Pressure

Pump, Removing and

Installing”, page 328

 .

5 - O-Ring

❑ Replace if damaged

6 - Roller Tappet

❑ Installation position: the roller points to the camshaft
❑ Remains inserted in the vacuum pump after removing the high pressure pump

7 - Fuel Line Connections

❑ 20 Nm

8 - Spring Clamp

❑ Replace after removing

9 - Fuel Line

❑ To the fuel rail intake manifold fuel injectors

10 - High Pressure Line

❑ 20 Nm
❑ To the combustion chamber fuel injectors fuel rail
❑ Lubricate the high pressure line with engine oil
❑ Do not install the high pressure line with tension. Make sure it is clean.

11 - High Pressure Line Connection

❑ 30 Nm
❑ When loosening the high pressure line, secure the connection from turning.