Component locations, overview

WARNING: This page is about a different variant/trim than selected.

NOTE:

Components marked with an asterisk (*) are checked via the On Board Diagnostic (OBD) program → Diagnostic Trouble Code (DTC) memory, checking and erasing
Components marked with a double asterisk (**) can be checked with the output DTM → Output Diagnostic Test Mode, performing .

Components A to C are not shown on the illustration.

Fig 1: Exploded View Of Diesel Direct Injection System Components

Courtesy of VOLKSWAGEN UNITED STATES, INC.

A - Brake Pedal Switch F47 * and Brake Light Switch F *

Together in one housing in footwell on brake pedal
Checking → Brake light switch and brake pedal switch, checking

B - Throttle Position (TP) Sensor G79 *

In footwell on accelerator
Checking: → 20 - FUEL SUPPLY

C - Clutch Pedal Switch F36

In footwell on clutch pedal
Checking → Clutch pedal switch, checking

Fig 2: Exploded View Of Diesel Direct Injection System Components

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Exhaust Gas Recirculation (EGR) valve

Checking: → 26 - EXHAUST SYSTEM, EMISSION CONTROLS

2 - Change-over Valve for Intake Manifold Flap N239 *

3 - Positive Crankcase Ventilation (PCV) Heating Element N79

Check voltage supply for Positive Crankcase Ventilation (PCV) Heating Element N79 between terminals 1 and 2 of the connector with ignition switched on; Specification: At least 11.5 V

4 - Connector

Through MY 1999: 52 pin
From MY 2000: 81 pin
Only disconnect or connect with ignition switched off
Release to disconnect

5 - Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 *

Checking voltage supply → Engine control module voltage supply, checking
Replacing → Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) J248 , replacing
Coding → Engine Control Module (ECM) J248 coding
Checking altitude sensor F96 Barometric Pressure (BARO) Sensor F96 → Manifold Absolute Pressure (MAP) sensor and Barometric Pressure (BARO) sensor, checking , Checking intake manifold pressure and altitude sensor

6 - Connector

Through MY 1999: 28 pin
From MY 2000: 40 pin
Only disconnect or connect with ignition switched off
Release to disconnect

7 - EGR Vacuum Regulator Solenoid Valve N18 */**

Checking: → 26 - EXHAUST SYSTEM, EMISSION CONTROLS

8 - Injector

For No. 3 cylinder with Needle Lift sensor G80 *

9 - Wastegate Bypass Regulator Valve N75 */**

Checking: → 21 - TURBOCHARGER, G-CHARGER

10 - Mass Air Flow (MAF) sensor G70 *

Checking → Mass Air Flow (MAF) sensor, checking

11 - O-ring

Replace if damaged

12 - Retaining clip

Check if seated securely

13 - Engine Coolant Temperature (ECT) Sensor G62 *

Blue
For engine control module
With Engine Coolant Temperature (ECT) Gauge Sensor G2
If necessary release pressure in cooling system before removing

Checking → Engine Coolant Temperature (ECT) sensor, checking
Wiring chamber 1 and wiring chamber 3 for Engine Coolant Temperature (ECT) Sensor G62
Terminals 1 and 3 gold plated

14 - 10 Nm

15 - Engine Speed (RPM) Sensor G28 *

Checking → Engine speed sensor, checking

16 - Spacer

17 - 2-pin connector

Brown
For Needle Lift Sensor G80

18 - 2-pin connector

Black
For Engine Speed (RPM) Sensor G28

19 - 10-pin connector

Black
For Fuel Temperature Sensor G81
For Cold Start Injector N108
For Fuel Cut-off Valve N109

For Quantity Adjuster N146
For Modulating Piston Displacement Sensor G149

20 - Cold Start Injector N108 */**

Checking injection timing control range → Diesel injection timing control range, checking

21 - Fuel Cut-off Valve N109 */**

22 - Injection pump quantity adjuster

With Fuel Temperature Sensor G81 *
With Quantity Adjuster N146 *
With Modulating Piston Displacement Sensor G149 *

23 - Manifold Absolute Pressure (MAP) Sensor G71 * and Intake Air Temperature (IAT) Sensor G72 *

Checking MAP Sensor → Manifold Absolute Pressure (MAP) sensor and Barometric Pressure (BARO) sensor, checking
Checking IAT Sensor → Intake Air Temperature (IAT) sensor, checking