Volkswagen New Beetle. Manual - part 1341

z

Intake manifold change-over flap must (after switching OFF ignition) close back and after approx. 3 
seconds re-open.  

If change-over does not occur, perform following checks: 

z

Check intake manifold change-over flap mechanics for freedom of movement by manually operating the 
rods by hand.  

z

Check vacuum function of positioning actuator using VAG1390 hand vacuum pump.  

z

Check vacuum lines for correct connection.  

If mechanical components OK: 

z

Check Intake Manifold Change-over Valve - N239-.  

Test sequence 

z

Disconnect -N239- harness connector.  

z

Measure resistance between -N239- terminals. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Diesel Fuel Injection, 1.9L ALH - New Beetle

  

Fig. 129: Measuring Resistance Between Change-Over Valve For Intake Manifold Flap -N239- 
Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Specification: 25 to 45 ohm  

If specification not obtained: 

z

Replace Intake Manifold Change-over Valve -N239-. 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Diesel Fuel Injection, 1.9L ALH - New Beetle

  

If specification obtained: 

z

Switch Fluke 83 multimeter to 20 Volt range.  

z

Connect multimeter between terminals 1 and 2 of ECM connector using jumper wires from VW 1594 
Adapter kit. 

Fig. 130: Identifying Change-Over Valve For Intake Manifold Flap -N239- Harness Connector 
Terminals 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Start engine and let idle.  

z

Specification: between 5 and 6 Volts  

z

Switch OFF ignition.  

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Diesel Fuel Injection, 1.9L ALH - New Beetle

  

z

Voltage value must rise to 11 to 15 Volts (battery Voltage) and after approx. 3 seconds fall to 0 Volts.  

If Voltage values do not change as described: 

z

Connect VAG1598/22 (or 1598/31) Test Box to ECM wiring harness. 

Fig. 131: Connecting VAG1598/22 (Or 1598/31) Test Box To ECM Wiring Harness 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

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

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Diesel Fuel Injection, 1.9L ALH - New Beetle