Volkswagen New Beetle. Manual - part 1955

Selectable diagnostic modes under address word 33 - OBD 

SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD 

Terminals at Engine Control Module 
(ECM)

121

121

121

Emissions limiting values according to

TLEV

(1)

LEV

(2)

LEV

(2)

On Board Diagnostic (OBD)

OBD II

OBD

II OBD II

DTC memory

Permanent memory

(3)

Permanent memory

(3)

Permanent memory

(3)

Memory for adaptation values

Temporary memory

(4)

Temporary memory

(4)

Temporary memory

(4)

Oxygen sensor control

2 sensors

2 sensors

2 sensors

Knock sensor control

2 knock sensors

2 knock sensors

2 knock sensors

Intake manifold change-over

No

No

No

Camshaft adjustment

No

Yes

Yes

Boost pressure regulation

Yes

Yes

Yes

Secondary Air Injection (AIR) system

Yes

Yes

Yes

Electronic engine performance 
regulation

Yes

Yes

Yes

(1)

TLEV = Transient Low Emission Vehicles (emission values max. 0.125 g/mi HC)

(2)

LEV = Low Emission Vehicles (emission values max. 0.075 g/mi HC)

(3)

Independent of voltage supply.

(4)

Values are erased when voltage supply is interrupted.

NOTE:

The conditions required for selecting the desired diagnostic mode are listed in 
the SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD 
table.

Diagnostic mode

Requirement:

Selectable diagnostic modes under address word 33 - 
OBD

z

engine 

off  

z

Ignition 

switched 

on.  

z

Engine 

running 

at idle  

z

Vehicle 

in drive 

mode 

Mode 
1:

Check measured 

values

See DIAGNOSTIC MODE 

1: CHECK MEASURED 

VALUES

Yes

Yes

Yes

Mode 
2:

Checking 

operating 

conditions

See DIAGNOSTIC MODE 

2: CHECKING 

OPERATING 

CONDITIONS

Yes

Yes

Yes

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

Connect diagnostic tester 

Recommended special tools and equipment.: 

z

VAS 5052 Vehicle Diagnostic and Information System with  

z

VAS 5052/3 diagnostic cable  

Requirements 

Mode 
3:

Check DTC 

Memory

See DIAGNOSTIC MODE 

3: CHECK DTC MEMORY

Yes

1)

Yes

Yes

Mode 
4:

Reset/erase 

diagnostic data

See DIAGNOSTIC MODE 

4: RESET/ERASE 

DIAGNOSTIC DATA

Yes

Yes

Yes

Mode 
5:

Check output of 

oxygen sensor 

signals

See DIAGNOSTIC MODE 

5: CHECK OUTPUT OF 

OXYGEN SENSOR 

SIGNALS

Yes

Yes

Yes

Mode 
6:

Check test results 

of components 

that are not 

continuously 

monitored

See DIAGNOSTIC MODE 

6: CHECK TEST 

RESULTS OF 

COMPONENTS THAT 

ARE NOT 

CONTINUOUSLY 

MONITORED

No

Yes

Yes

Mode 
7:

Check test results 

of components 

that are 

continuously 

monitored

See DIAGNOSTIC MODE 

7: CHECK TEST 

RESULTS OF 

COMPONENTS THAT 

ARE CONTINUOUSLY 

MONITORED

Yes

(1)

Yes

Yes

Mode 
8:

Tank leak test

See DIAGNOSTIC MODE 

8: TANK LEAK TEST

No

Yes

No

Mode 
9:

Vehicle 

information

See DIAGNOSTIC MODE 

9: VEHICLE 

INFORMATION

Yes

Yes

Yes

(1)

Perform only with ignition switched on when engine does not start (operate starter beforehand for at 
least 6 seconds).

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

Fig. 1: Identifying VAS 5052 Vehicle Diagnostic And Information System 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

The respective fuses of the Motronic fuel injection and ignition system must be OK. Fuse holder is 
located behind access panel at far left end of dash. 

Fig. 2: Identifying Fuses 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Battery voltage must be at least 11.5 volts.  

z

All electrical consumers such as, for example, lights and rear window defroster must be switched off.  

z

Parking brake must be engaged or else daylight driving lights will be switched on.  

z

For vehicles with automatic transmission, selector lever must be in position -P- or -N-.  

z

If vehicle is equipped with an A/C system, it must be switched off.  

z

Ground (GND) connections between engine and chassis must be OK.  

z

Ignition switched off.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle

  

Work procedure 

Connect diagnostic tester (VAS 5052) using (VAS 5052/3) diagnostic cable as follows: 

z

Connect diagnostic cable connector to Data Link Connector (DLC) -arrow-. 

Fig. 3: Identifying Data Link Connector (DLC) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Depending on the desired diagnostic mode, it is necessary to:switch on ignition  

or start engine, see SELECTABLE DIAGNOSTIC MODES UNDER ADDRESS WORD 33 - OBD . 

Connect test box for wiring test 

Recommended special tools and equipment 

z

VAG1598/31 test box 

NOTE:

z

Respective operation of the diagnostic tester: 

See Operating instructions of the diagnostic tester 

z

If no display appears on diagnostic tester, check voltage supply at 
Diagnostic Link Connector (DLC).  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE On-Board Diagnostic (OBD), 1.8L Generic Scan Tool - New Beetle