Volkswagen New Beetle. Manual - part 1551

 

  Index      Volkswagen     Volkswagen New Beetle 1998-2008 year - service repair manual

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  1549  1550  1551  1552   ..

 

 

Volkswagen New Beetle. Manual - part 1551

 

 

z

Measure resistance between contacts 1 + 2 at connections to knock sensors.  

Specification INFINITY ohm 

Fig. 20: Measuring Resistance Between Contacts 1 And 2 At Knock Sensor Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

If the specification is not obtained: 

z

Replace Knock sensor/s -G61- or -G66-, see item 12 or item 17 .  

z

Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, see 
DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .  

z

Read-out readiness code, see READINESS CODE, DISPLAYING . If DTC memory has been erased or 
engine control module was disconnected from permanent positive, readiness code must be generated 
again, see READINESS CODE, GENERATING .  

If the specification is obtained: 

z

Check wiring, see CHECKING WIRING .  

Checking wiring 

z

Remove inner plenum chamber cover, left: 

See PLENUM CHAMBER INNER COVER, REMOVING AND INSTALLING . 

z

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

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 21: Connecting Test Box V.A.G 1598/31 To Control Module Wiring Harness 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Check wiring between test box and 2 -pin connector for open circuit using wiring diagram. 

-G61- -G66- 

Contact 1 + socket 106 107 

Contact 2 + socket 99 99 

Wire resistance: Max. 1.5 ohm 

Fig. 22: Identifying Knock Sensor 2-Pin Harness Connector Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Additionally check wires at socket 99 for short to sockets 106 and 107.  

Specification: INFINITY ohm 

 

2003 Volkswagen New Beetle GLS 

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

  

If no malfunctions in wiring are detected: 

z

Loosen knock sensor and tighten again to 20 Nm.  

z

Perform a test drive again and check knock control specifications on display.  

During the road test coolant temperature must exceed 85 °C 

When the temperature is reached, the operating conditions must be attained several times: 

z

Idle  

z

Part throttle  

z

Wide open throttle  

z

Overrun  

z

At Wide open throttle the speed must exceed 3500 RPM.  

z

Again check control module DTC memory.  

If the malfunction is still present: 

z

Replace Knock sensor/s -G61- or -G66-, see item 12 or item 17 .  

z

Check DTC memory, if necessary, repair any malfunctions and then erase DTC memory, see 
DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .  

z

Read readiness code, see READINESS CODE, DISPLAYING . If DTC memory has been erased or 
engine control module was disconnected from permanent positive, readiness code must be generated 
again, see READINESS CODE, GENERATING .  

Misfiring recognition, checking 

Special tools, test equipment and auxiliary items 

z

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

Test sequence 

z

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 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 23: VAG 1551 Scan Tool Display - Checking Misfiring Recognition (1 Of 5) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

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

Indicated on display 

Fig. 24: VAG 1551 Scan Tool Display - Checking Misfiring Recognition (2 Of 5) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Press keys 0, 1 and 4 for "Display group number 14" and confirm entry with Q key.  

Indicated on display (1-4 Display zones) 

 

2003 Volkswagen New Beetle GLS 

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

  

 

 

 

 

 

 

 

Content   ..  1549  1550  1551  1552   ..