Volkswagen New Beetle. Manual - part 1556

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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 
Engine Control Module was disconnected from battery positive, readiness code must be generated again, 
see READINESS CODE, GENERATING . 

The LED does not flicker: 

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Check wiring, see CHECKING WIRING .  

Checking wiring 

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Remove inner plenum chamber cover, left: 

See PLENUM CHAMBER INNER COVER, REMOVING AND INSTALLING 

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Connect V.A.G 1598/31 test box to control module wiring harness. Engine Control Module is not 
connected by this action. 

Fig. 15: Connect V.A.G 1598/31 Test Box To Control Module Wiring Harness 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Check wiring between test box and 4 -pin connector for open circuit according to Electrical Wiring 
Diagrams. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Ignition/Glow plug system, 1.8L AWP, AWV - New Beetle

  

Fig. 16: Identifying Ignition Coil 4-Pin Harness Connector Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Cylinder 1 terminal 3 + socket 102  

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Cylinder 2 terminal 3 + socket 95  

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Cylinder 3 terminal 3 + socket 103  

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Cylinder 4 terminal 3 + socket 94  

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Wire resistance: Max. 1.5 ohm  

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Additionally check wires for short to one another. 

Specification: ohm 

If no malfunction can be found in the wiring: 

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Replace Engine Control Module (ECM), see MOTRONIC ENGINE CONTROL MODULE (ECM) - 
J220-, REPLACING .  

Knock Sensors (KS), checking 

Special tools, test equipment and auxiliary items 

NOTE:

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It is extremely important to keep to the tightening torque of 20 Nm to 
ensure the Knock Sensors (KS) perform perfectly.  

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Knock Sensors (KS) 1 -G61- and 2 -G66- have a direct 2 -pin connector and 
consequently no terminal for the shielding in the connector  

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Only gold-plated terminals may be used when servicing the Knock Sensor 
(KS) connector terminals.  

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Contact surfaces between Knock Sensor (KS) and cylinder block must be 
free of corrosion, dirt and grease.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Ignition/Glow plug system, 1.8L AWP, AWV - New Beetle

  

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V.A.G 1551 scan tool (or V.A.G 1552 mobile scan tool) with V.A.G 1551/3B cable  

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V.A.G 1598/31 test box  

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V.A.G 1526 A or Fluke 83 multimeter  

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V.A.G 1594 C adapter set  

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Electrical Wiring Diagrams  

Test conditions 

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On Board Diagnostic (OBD) must have recognized a malfunction in one or both Knock Sensors (KS), see 
DTC MEMORY OF MOTRONIC ENGINE CONTROL MODULE (ECM) -J220-, CHECKING 
AND ERASING  

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Engine Coolant Temperature must be at least 85 ° C display group 28, display zone 3  

Checking function 

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

Indicated on display 

Fig. 17: Identifying Scan Tool Display - Knock Sensors, Checking (1 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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

Indicated on display 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Ignition/Glow plug system, 1.8L AWP, AWV - New Beetle

  

Fig. 18: Identifying Scan Tool Display - Knock Sensors, Checking (2 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0-, -2- and -8- for the "Display group number 28" and confirm entry with -Q- button.  

Indicated on display (1--4 - Display zones) 

Fig. 19: Identifying Scan Tool Display - Knock Sensors, Checking (3 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Perform a road test and check knock control specifications on display (display zone 4).  

Observe the valid safety precautions when road testing, see SAFETY PRECAUTIONS . 

DISPLAY GROUP 28: IGNITION, KNOCK CONTROL SPECIFICATION 

NOTE:

Checking the Knock Sensors (KS) must be performed during a road test 
because the Knock Sensors (KS) OBD is not activated until the engine speed 
exceeds 2000 RPM and the engine is loaded by more than 40%.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Ignition/Glow plug system, 1.8L AWP, AWV - New Beetle