Volkswagen New Beetle. Manual - part 1727

 

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Volkswagen New Beetle. Manual - part 1727

 

 

Observe the safety precautions that apply to road tests, see SAFETY PRECAUTIONS . 

z

Disconnect connection hose between intake manifold and fuel pressure regulator at intake manifold and 
connect to T-piece of turbocharger tester (VAG1397A). 

Fig. 8: Connecting To T-Piece Of Turbocharger Tester (VAG1397A) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

NOTE:

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Using turbocharger tester, see operating instructions.  

z

The hoses must be connected absolutely free of leaks.  

z

When charge pressure is measured during the drive, a second person is 
necessary to operate the turbocharger tester for safety reasons.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Turbocharger, G - Charger, 1.8L Generic Scan Tool - New Beetle

  

z

Measure charge pressure at Wide Open Throttle (WOT):  

On dynamometer 

In 3rd gear or in 2nd drive mode 

While driving 

Vehicles with manual transmission 

z

Accelerate vehicle at Wide Open Throttle (WOT) in 2nd gear 

Vehicles with automatic transmission 

z

Manually place vehicle in 4th gear and accelerate vehicle from low speed at Wide Open Throttle (without 
kick down, transmission does not downshift any more).  

Engine code APH 

z

At 3000 RPM, press the "M" memory button on turbocharger tester and read out the test value. 

Specified value: (absolute pressure) 

1.300... 1.750 bar 

Engine code AWP 

z

Between 1800 to 2300 RPM, press the "M" memory button on turbocharger tester and read out the test 
value. 

Specified value: (absolute pressure) 

1.350... 2.000 bar 

Engine code AWV 

z

Between 1800 to 2300 RPM, press the "M" memory button on turbocharger tester and read out the test 
value. 

Specified value: (absolute pressure) 

1.350... 1.750 bar 

z

Make sure that the pressure hose is not pinched between engine hood and 
chassis.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Turbocharger, G - Charger, 1.8L Generic Scan Tool - New Beetle

  

Continuation for all vehicles 

If boost pressure is exceeded: 

z

Check the Charge Air Pressure Sensor -G31-, see CHARGE AIR PRESSURE SENSOR, 
CHECKING
 .  

z

Check Wastegate Bypass Regulator Valve - N75-. (Throughput in hose from turbocharger via valve to 
vacuum diaphragm with connector disconnected), see WASTEGATE BYPASS REGULATOR 
VALVE, CHECKING
 .  

z

Check for proper seating of vacuum diaphragm for wastegate bypass regulator valve at turbocharger.  

z

Check vacuum diaphragm, see VACUUM DIAPHRAGM FOR WASTEGATE BYPASS 
REGULATOR VALVE, CHECKING
  

z

Check bearing for shaft of wastegate bypass regulator valve in turbocharger for ease of movement. If 
rusted solid, replace turbocharger.  

z

Replace turbocharger, see item no. 6  

z

Erase DTC memory of Engine Control Module (ECM), see DIAGNOSTIC MODE 4: RESET/ERASE 
DIAGNOSTIC DATA
 .  

z

Generate readiness code, see READINESS CODE, GENERATING . 

If boost pressure is not reached: 

z

Check the Charge Air Pressure Sensor -G31-, see CHARGE AIR PRESSURE SENSOR, 
CHECKING
 .  

z

Check Wastegate Bypass Regulator Valve - N75-, see WASTEGATE BYPASS REGULATOR 
VALVE, CHECKING
 .  

z

Check bearing for shaft of wastegate bypass regulator valve in turbocharger for ease of movement. If 
rusted solid, replace turbocharger.  

z

Replace turbocharger, see item no. 6  

z

Erase DTC memory of Engine Control Module (ECM), see DIAGNOSTIC MODE 4: RESET/ERASE 
DIAGNOSTIC DATA
 .  

z

Generate readiness code, see READINESS CODE, GENERATING .  

Wastegate bypass regulator valve, checking 

Recommended special tools and equipment: 

z

VAG1526 multimeter or VAG1715 multimeter  

z

VAG1594 connector test kit  

Test sequence 

NOTE:

Repeat measurement if boost pressure was not fully charged or if the 
difference between actual and specified values was too large.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Turbocharger, G - Charger, 1.8L Generic Scan Tool - New Beetle

  

z

Disconnect connector -2- at Wastegate Bypass Regulator Valve -N75- (arrow). 

Fig. 9: Disconnecting Connector At Wastegate Bypass Regulator Valve 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Measure resistance between terminals of valve. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Turbocharger, G - Charger, 1.8L Generic Scan Tool - New Beetle

  

 

 

 

 

 

 

 

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