Exhaust turbocharging system (engine code AWD), overview

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen GTI, 2005 Volkswagen Jetta, 2005 Volkswagen GTI, 2004 Volkswagen Jetta, and 2004 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exhaust Turbocharging System (Engine Code AWD), Overview

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Connecting hose

From Leak Detection Pump (LDP) V144

2 - To vacuum reservoir

Below front right wheel housing liner

3 - Non-return valve

4 - Turbocharger

5 - Non-return valve

6 - Vacuum diaphragm

For boost pressure regulator valve

7 - Deceleration shut-off valve

8 - Wastegate Bypass Regulator Valve N75

Valve is activated (pulsed) by engine control module
Check activation.

9 - Brake booster

10 - Non-return valve

For brake booster

11 - Air filter with Mass Air Flow (MAF) Sensor G70

12 - Crankcase housing ventilation pressure regulator valve

13 - Combi-valve

For Secondary Air Injection (AIR) system
Checking, refer to Combi-valve, checking Combi-valve, checking

14 - Fuel pressure regulator

15 - Non-return valve

16 - Turbocharger Recalculating Valve N249

17 - Secondary air injection (AIR) solenoid valve N112

Checking, refer to Secondary Air Injection (AIR) Solenoid Valve N112 , checking

18 - Crankcase ventilation

19 - Non-return valve

20 - Charge Air Pressure Sensor G31

Replace O-ring if damaged

21 - Secondary Air Injection (AIR) Pump Motor V101

Function, checking refer to Secondary Air Injection (AIR) Pump Motor V101 , checking

22 - Air charge cooler

23 - To vacuum reservoir

24 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve 1 N80

Check activation
Function, checking refer to Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 , checking

25 - Connecting hose

To EVAP canister