Volkswagen New Beetle. Manual - part 1550

 

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Volkswagen New Beetle. Manual - part 1550

 

 

Courtesy of VOLKSWAGEN OF AMERICA, INC.

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

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Cylinder 1 contact 3 + socket 102  

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Cylinder 2 contact 3 + socket 95  

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Cylinder 3 contact 3 + socket 103  

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Cylinder 4 contact 3 + socket 94  

Fig. 15: Identifying Ignition Coil Power Output Stage 4-Pin Connector Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Wire resistance: Max. 1.5 ohm 

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Additionally check wires for short to one another. 

Specification: INFINITY ohm 

If no malfunction can be found in the wiring: 

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Replace Engine Control Module (ECM), see ENGINE CONTROL MODULE (ECM), REPLACING 

Knock sensors, checking 

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Only gold-plated contacts may be used when servicing the knock sensor connector contacts.  

Special tools, test equipment and auxiliary items 

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Scan tool V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3B  

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Test box V.A.G 1598/31  

NOTE:

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It is extremely important to keep to the tightening torque of 20 Nm to 
ensure the knock sensors perform perfectly.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 1.8L APH - New Beetle

  

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Multimeter Fluke 83 (or equivalent)  

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Adapter set V.A.G 1594  

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Wiring diagram  

Check conditions 

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On Board Diagnostic (OBD) must have recognized a malfunction in one or both knock sensors, see 
DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING  

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Coolant temperature must be at least 85 °C, see display group 28, display zone 3  

Checking function 

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Connect scan tool V.A.G 1551 ((V.A.G 1552). 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 V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL 
MODULE
 .  

Indicated on display 

Fig. 16: VAG 1551 Scan Tool Display - Checking Knock Sensor (1 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.  

Indicated on display 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 1.8L APH - New Beetle

  

Fig. 17: VAG 1551 Scan Tool Display - Checking Knock Sensor (2 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press keys 0, 2 and 8 for "Display group number 28" and confirm entry with Q key.  

Indicated on display (1-4 Display zones) 

Fig. 18: VAG 1551 Scan Tool Display - Checking Knock Sensor (3 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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

Observe the valid safety precautions when performing a test drive, see SAFETY PRECAUTIONS .

NOTE:

Checking the knock sensors must be performed during a test drive because the 
knock sensors 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 PERFORMANCE Ignition-Glow Plug System, 1.8L APH - New Beetle

  

DISPLAY GROUP 28: IGNITION, KNOCK CONTROL

If the specification is attained: 

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Press --> key.  

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Press keys 0 and 6 for function "End output" and confirm entry with Q key.  

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Switch off ignition.  

Continuation: 

If the specifications are not obtained: 

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Press --> key.  

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Press keys 0 and 6 for function "End output" and confirm entry with Q key.  

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Switch off ignition.  

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Separate 2-pin connector to Knock sensor 1 -G61- -1- and/or 2 - pin connector to Knock sensor 2 -G66- -
2-. 

Fig. 19: Separating 2-Pin Connector To Knock Sensors 
Courtesy of VOLKSWAGEN OF AMERICA, INC.

 

Display zones

1

2

3

4

Display group 28: ignition, knock control
Display

xxxx RPM

xxx.x %

xxx.x °C

Test OFF/Test ON

Syst. OK.

Syst. n. OK.

Indicated

Engine speed (in 

steps of 40)

Engine 

load

Coolant 

temperature

OBD condition and OBD result

Working 
range

0-6800 RPM

0.0 - 

100.0 %

-45.0 -143.0 °C

-

Specification at least 2000 RPM > 40.0 %

85.0 -105.0 °C

Syst. OK.

-

-

-

If the specifications are not achieved, see 

CONTINUATION:

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Ignition-Glow Plug System, 1.8L APH - New Beetle

  

 

 

 

 

 

 

 

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