Volkswagen New Beetle. Manual - part 1271

 

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Volkswagen New Beetle. Manual - part 1271

 

 

If specification not obtained: 

z

Perform Output Diagnostic Test Mode to activate Wastegate Bypass Regulator valve: 

See Function 03: Output Diagnostic Test Mode, Performing . 

Display will appear as shown in Fig. 7 . 

Fig. 7: Identifying VAG 1551/1552 Scan Tool Display (3 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

If rod moves but pressure specifications are not obtained

NOTE:

The valve must function and the charge air pressure control rod must move 
back and forth (at least 3 to 4 times), as long as there is a vacuum in the 
vacuum reservoir.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Exhaust System, Emission Controls - 1.9L 4-Cyl. - ALH, New Beetle

  

z

Replace turbocharger.  

If rod does not move because solenoid valve is not working: 

z

Check Wastegate Bypass Regulator valve -N75-. See WASTEGATE BYPASS REGULATOR 
VALVE -N75-, CHECKING
 .  

z

Check vacuum hoses. See TURBOCHARGER, HOSE AND PIPE CONNECTIONS .  

If rod does not move but solenoid operates: 

z

Connect VAG 1390 vacuum pump to Wastegate Bypass Regulator valve and check rod for ease of 
movement. 

Fig. 8: Connecting Turbocharger To VAG 1390 Vacuum Pump 
Courtesy of VOLKSWAGEN OF AMERICA, INC.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Exhaust System, Emission Controls - 1.9L 4-Cyl. - ALH, New Beetle

  

If rod does not move easily: 

z

Replace turbocharger assembly.  

Wastegate Bypass Regulator valve -N75-, checking 

z

Switch ignition off.  

z

Disconnect Wastegate Bypass Regulator valve.  

z

Measure resistance between valve terminals.  

Engine code ALH 

Fig. 9: Measuring Resistance Between Wastegate Bypass Regulator Valve Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Specification: 14 to 20 ohms 

If specification not obtained: 

z

Replace Wastegate Bypass Regulator valve -N75-.  

If specification obtained: 

z

Switch ignition on.  

z

Measure supply voltage at valve connector terminal 1 and at engine Ground. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Exhaust System, Emission Controls - 1.9L 4-Cyl. - ALH, New Beetle

  

Fig. 10: Measuring Supply Voltage At Wastegate Bypass Regulator Valve Connector Terminal 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Specification: approx. battery voltage 

If specification not obtained: 

z

Switch ignition off.  

z

Connect test box VAG 1598/22 to ECM wiring harness. 

Fig. 11: Connecting Test Box VAG 1598/22 To ECM Wiring Harness 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Check wiring for open circuit between Test Box and harness connector using Wiring diagram.  

Up to MY 1999 

z

Terminal 1 + sockets 2 + 28  

z

Terminal 2 + socket 15  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Exhaust System, Emission Controls - 1.9L 4-Cyl. - ALH, New Beetle

  

 

 

 

 

 

 

 

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