Volkswagen New Beetle. Manual - part 1627

Fig. 104: Identifying Scan Tool Display - Read Measuring Value Block 32 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Check oxygen sensor control learned values at idling speed (additive) in display zone 1. 

Specification: -3.0...3.0% 

z

Check oxygen sensor control learned values at part load (multiplicative) in display zone 2. 

Specification: -10.0...10.0% 

DISPLAY GROUP 32: OXYGEN SENSOR CONTROL LEARNED VALUES BEFORE THREE 
WAY CATALYTIC CONVERTER (TWC) 

 

Display zones

1

2

3 4

Display group 32: oxygen sensor control learned values before Three Way Catalytic Converter 
(TWC)
Display

xx.x %

xx.x %

- -

Indicated

Oxygen sensor control learned 

value at idling (additive)

Oxygen sensor control learned value at part load 

(multiplicative)

- -

Working 
range

-25.0 to 25.0%

-25.0 to 25.0%

- -

Specification

-3.0 to 3.0% 

can fluctuate slightly 

If the specifications are not 

achieved

-10.0 to 10.0% 

can fluctuate slightly 

See CHECKING OXYGEN SENSOR WIRING 

FOR OXYGEN SENSOR 1 , Evaluating display 

group 32

- -

- -

NOTE:

In display zones 1 and 2: 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

If the specification is obtained: 

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Change to display group 33 as follows: 

VAG 1551: Press button -3- 

VAG 1552: Press button 

Indicated on display (1 to 2 Display zones)

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Oxygen Sensor control learned values are fuel dependent!  

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Low values indicate that the engine is running too rich and therefore 
the oxygen sensor control is leaning the mixture.  

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High values indicate that the engine is running too lean and therefore 
the oxygen sensor control enriches the mixture.  

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If there is no voltage supply to the control module all the values 
learned will be cancelled.  

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add = additive - The effects of the malfunction (e.g. unmetered air) 
will reduce as the engine speed increases. The injection period will 
be modified by a fixed amount for additive learned values. This 
amount is not dependent upon the basic injection period.  

z

mul = multiplicative - The effects of the malfunction (e.g. 
malfunctioning fuel injector) will increase as the engine speed 
increases. A multiplicative learned value is a proportional change to 
the injection period. This change is dependent on the basic injection 
period. 

Initiating learning process: Control module in mode 04, Basic 
settings 

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Learning prerequisites for idle speed: idle speed, Engine Coolant 
Temperature (ECT) min. 75 C, intake air temperature max. 90 °C.  

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Learning prerequisites for part load: Engine Coolant Temperature 
(ECT) min. 75 °C, intake air temperature max. 90 °C  

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EVAP canister purge regulator valve must be closed and the A/C 
compressor must be off.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

Fig. 105: Identifying Scan Tool Display - Read Measuring Value Block 33 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Observe oxygen sensor control in display zone 1. Display must fluctuate at least 2% in the range -10.0 to 
10.0%  

DISPLAY GROUP 33: OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC 
CONVERTER (TWC) 

 

Display zones

1

2

3 4

Display group 33: oxygen sensor control before Three Way Catalytic Converter (TWC)
Display

xx.x %

x.xxx V

- -

Indicated

Oxygen sensor control before Three Way Catalytic 

Converter (TWC)

Oxygen sensor voltage before 

Three Way Catalytic 

Converter (TWC)

- -

Working 
range

-25.0 to 25.0%

-

- -

Specification The value must fluctuate at least 2% in -10.0 to 10.0% 

range

-

- -

If the specification is not obtained, see CHECKING 

OXYGEN SENSOR WIRING FOR OXYGEN 

SENSOR 1 , Continuation

-

- -

NOTE:

In display zone 1: the display must fluctuate around 0.0%. If 0.0% is displayed 
constantly, the oxygen sensor control has switched from regulation to control, 
because there is a malfunction in the oxygen sensor control. Check DTC 
Memory, see DTC MEMORY OF MOTRONIC ENGINE CONTROL MODULE (ECM) 
-J220-, CHECKING AND ERASING .

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

If the specification is obtained: 

z

Press --> button.  

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Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.  

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Switch off ignition. 

Continuation 

If the oxygen sensor control in display zone 1 does not fluctuate as stated: 

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Press --> button.  

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Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.  

z

Test drive vehicle to remove possible residue on oxygen sensor and repeat check. 

Observe the valid safety precautions when carrying out a road test, see SAFETY PRECAUTIONS . 

If the specifications in display zone 1 are not obtained even after a test drive, or the value does not 
fluctuate by at least 2%: 

z

Check oxygen sensor before Three Way Catalytic Converter (TWC) for aging, see OXYGEN SENSOR 
AGING, OXYGEN SENSOR BEFORE THREE WAY CATALYTIC CONVERTER (TWC), 
CHECKING .  

Evaluating display zone 33, display zones 1 - oxygen sensor control learned values before Three Way 
Catalytic Converter (TWC) 

EVALUATING DISPLAY ZONE 33, DISPLAY ZONES 1 - OXYGEN SENSOR CONTROL LEARNED 
VALUES BEFORE THREE WAY CATALYTIC CONVERTER (TWC) - 1 OF 2 

Appears on 
display

Possible cause

Corrective action

Low oxygen 
sensor control 
learned values

z

Low learned values at idling but 

with normal learned values at part 

throttle: possible oil dilution (high 

level of fuel in oil)  

z

Fuel injector leaking  

z

Fuel pressure too high  

z

EVAP solenoid valve 1 

permanently open  

z

Mass Air Flow (MAF) sensor 

malfunctioning  

z

Heated Oxygen Sensor (HO2S) 

malfunctioning or oxygen sensor 

soiled  

z

Check if it disappears after highway 

drive or oil change 

z

Check fuel injector, see FUEL 

INJECTORS, CHECKING

z

Check fuel pressure regulator and 

holding pressure, see FUEL 

PRESSURE REGULATOR AND 

HOLDING PRESSURE, CHECKING

z

Check EVAP solenoid valve 1, see 

OUTPUT DIAGNOSTIC TEST 

MODE (DTM)

z

Check Mass Air Flow (MAF) sensor, 

see MASS AIR FLOW (MAF) 

SENSOR, CHECKING

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle