Component locations, overview

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 1999 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

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