Volkswagen New Beetle. Manual - part 1729

MODULE (ECM) .  

Checking function 

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Connect test box to control module wiring harness, see CONNECT TEST BOX FOR WIRING TEST . 

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Re-connect connector at Charge Air Pressure Sensor -G31-.  

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Use adapter cables from VAG1594 to connect multimeter to sockets 101 (B+) + 108 (Ground -GND-) for 
voltage measurement.  

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Start engine and measure voltage. 

Specified value: 1.80 to 2.00 volts 

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Bring engine to RPM by depressing accelerator pedal suddenly. 

Specified value: 2.00 to 3.00 volts 

If specified values are not obtained: 

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Replace Charge Air Pressure Sensor -G31-, see item 3  

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

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Generate readiness code, see READINESS CODE, GENERATING .  

Recirculating valve for turbocharger, checking 

Valve opens between connection to intake manifold and connection to deceleration shut-off valve with no 
voltage. Connection to vacuum reservoir is closed. 

Test sequence 

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Switch ignition off.  

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Disconnect connector from Recirculating valve for turbocharger -N249-.  

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Measure resistance between terminals of valve. 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 14: Measuring Resistance Between Terminals Of Turbocharger Recirculating Valve 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Specified value: 25...35 ohm 

If specified value is not obtained: 

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Replace Recirculating valve for turbocharger -N249-: 

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Vehicles with engine code APH, see item 16  

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Vehicles with engine code AWP, AWV, see item 16  

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

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Generate readiness code, see READINESS CODE, GENERATING . 

 

2003 Volkswagen New Beetle GLS 

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

  

If specified values are obtained: 

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Connect test box to control module wiring harness, see CONNECT TEST BOX FOR WIRING TEST . 

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Check wire between test box socket 105+2-pin connector terminal 2 for open circuit according to wiring 
diagram. 

Wire resistance: max. 1.5 ohm 

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Also check the wire for short circuit to B+ and Ground (GND). 

If no malfunctions are found in wire: 

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Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit 
according to wiring diagram. 

Wire resistance: max. 1.5 ohm 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 15: Identifying 2-Pin Turbocharger Recirculating Valve Harness Connector Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

If no malfunctions are found in wires: 

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

Vacuum diaphragm for wastegate bypass regulator valve, checking 

Recommended special tools and equipment e.g.: 

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VAG1526 multimeter or VAG1715 multimeter 

 

2003 Volkswagen New Beetle GLS 

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