Volkswagen New Beetle. Manual - part 1684

Fig. 93: Identifying Scan Tool Display - Checking For Unmetered Air Leaks (1 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0- and -8- for function "Read measuring value block" and confirm entry with -Q- button. 

Indicated on display 

Fig. 94: Identifying Scan Tool Display - Checking For Unmetered Air Leaks (2 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0-, -0- and -1- for "Display group number 1" and confirm entry with -Q- button. 

Indicated on display (1 to 4 Display zones)

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 95: Identifying Scan Tool Display - Checking For Unmetered Air Leaks (3 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Check whether Engine Coolant Temperature (ECT) is above 80 °C in display zone 2.  

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Observe engine speed in display zone 1 and oxygen sensor control before Three Way Catalytic Converter 
(TWC) in display zone 3.  

DISPLAY GROUP 1: IDLING TEST 

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Systematically spray parts of intake system with engine leak detector spray. 

If the engine speed drops or the oxygen sensor control changes: 

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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.  

 

Display zones

1

2

3

4

Display group 1: Idling test
Display

xxxx RPM

xxx.x °C

xx.x %

xxxxxx

Indicated

Engine speed 

(in steps of 

40)

Engine Coolant 

Temperature (ECT)

Oxygen sensor control 

before Three Way Catalytic 

Converter (TWC)

Adjustment 

conditions for basic 

setting

Working 
range

0 to 6800 

RPM

-48.0 to 143.05C

-10.0 to 10.0%

-

Specification

760 to 810 

RPM 

(1)

 

700 to 750 

RPM 

(2)

80.0 to 115.05C

The value must fluctuate by 

at least 2% in the -10.0 to 

10.0% range

-

(1)

Engine idling at normal operating temperature for manual transmission

(2)

Engine idling at normal operating temperature for automatic transmission

 

2003 Volkswagen New Beetle GLS 

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

  

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Switch off ignition.  

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Check sprayed areas of intake system for leaks and repair if necessary.  

If the engine speed and the oxygen sensor control do not change: 

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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.  

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Switch off ignition.  

FUNCTIONS, CHECKING 

Idle speed, checking 

Special tools, test equipment and auxiliary items 

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VAG 1551 scan tool or VAG 1552 mobile scan tool with VAG 1551/3B cable  

Test conditions 

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Exhaust system between Three Way Catalytic Converter (TWC) and cylinder head must be free of leaks  

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All electrical accessories, e.g. lights and rear window defroster must be switched off  

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If the vehicle is equipped with air conditioning, it must be turned off  

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On vehicles with automatic transmission selector lever in "P" or "N" position  

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Engine Coolant Temperature (ECT) must be at least 80 °C display group 04, display zone 3  

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Intake air temperature less than 60 °C, see display group 04, display zone 4  

Test sequence 

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Connect VAG 1551 scan tool ((VAG 1552). Start engine and select "Address word" 01 of Motronic 
Engine Control Module (ECM) -J220-. Engine must be running at idle speed. Connecting scan tool and 
selecting Motronic Engine Control Module (ECM) -J220-, see VAG 1551, CONNECTING AND 
SELECTING MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- .  

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- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, see DTC 
MEMORY OF MOTRONIC ENGINE CONTROL MODULE (ECM) -J220-, CHECKING AND 
ERASING .  

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Read readiness code, see READINESS CODE, DISPLAYING . If DTC memory has been erased or 

NOTE:

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Idle speed, ignition timing and CO content not adjustable.  

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The idle speed is regulated to specification by the throttle valve positioner 
in conjunction with the DIS function.  

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CO content regulated by oxygen sensor control. Malfunctions in oxygen 
sensor control are detected in On Board Diagnostic (OBD) and stored in 
DTC memory.  

 

2003 Volkswagen New Beetle GLS 

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

  

Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive, readiness code 
must be generated again, see READINESS CODE, GENERATING .  

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Leave VAG 1551 scan tool connected.  

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Continue running engine at idle speed. 

Indicated on display 

Fig. 96: Identifying Scan Tool Display - Checking Idle Speed (1 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0- and -4- for function "Basic Setting" and confirm entry with -Q- button. 

Indicated on display 

Fig. 97: Identifying Scan Tool Display - Checking Idle Speed (2 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC.

 

2003 Volkswagen New Beetle GLS 

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