Volkswagen New Beetle. Manual - part 1378

 

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Volkswagen New Beetle. Manual - part 1378

 

 

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Specification: INFINITY ohm  

If wiring OK: 

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Replace Engine Control Module -J248-. See Engine Control Module (ECM), replacing .  

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Erase DTC memory. See DTC MEMORY, ERASING . (Disconnecting the Engine Coolant 
Temperature sensor generates a DTC).  

Brake Light Switch -F63- and Brake Vacuum Vent Valve Switch for Cruise Control/Diesel Fuel Injection -F47-, 
checking 

The Diesel injection system senses throttle pedal travel via the Throttle Position Sensor -G79-. As with any 
mechanical device, -G79- could be faulty. For reasons of safety, engine speed is regulated when the brakes are 
applied. To accomplish this, the ECM requires signals from the Brake Light Switch -F- and the Brake Vacuum 
Vent Valve Switch -F47-. This means that if the brakes are applied while the throttle pedal is depressed, engine 
speed will immediately drop to an idle. An incorrectly adjusted switch could lead to unnecessary regulating 
action. 

Special tools 

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VAG1551/1552 Scan Tool using VAG1551/3 Adapter cable  

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VAG1598/22 Test Box (MY 1999)  

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VAG1598/31 Test Box (from MY 2000)  

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Fluke 83 multimeter  

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VW 1594 Adapter kit  

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Wiring diagram  

Test sequence 

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Connect VAG1551/1552 Scan Tool. See VAG1551/1552 SCAN TOOL, CONNECTING .  

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Switch ON ignition but do not start engine.  

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Press -0- and -1- buttons to select Address word 01: "Engine electronics"  

Display will appear as shown (example only):

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 52: Scan Tool Display - Brake Light Switch & Brake Vacuum Vent Valve Switch (1 Of 6) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press --> button.  

Display will appear as shown: 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 53: Scan Tool Display - Brake Light Switch & Brake Vacuum Vent Valve Switch (2 Of 6) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press -0- and -8- buttons to select Function 08: "Read measuring value block".  

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Press -Q- button to enter input.  

Display will appear as shown: 

Fig. 54: Scan Tool Display - Brake Light Switch & Brake Vacuum Vent Valve Switch (3 Of 6) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0-, -0- and -6- to select "Display group 6".  

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Press -Q- button to enter input.  

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Observe values in Display zone 2.  

Specification: 0 0 0 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 55: Scan Tool Display - Brake Light Switch & Brake Vacuum Vent Valve Switch (4 Of 6) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Slowly operate brake pedal.  

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Specification: 0 1 1  

Both displays must change from 0 to 1 at same time. 

Fig. 56: Scan Tool Display - Brake Light Switch & Brake Vacuum Vent Valve Switch (5 Of 6) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Center display = Brake Vacuum Vent Valve Switch -F47-  

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Right-hand display = Brake Light Switch -F-  

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Slowly release brake pedal to rest position again.  

Both displays must change from 1 to 0 again.

 

2003 Volkswagen New Beetle GLS 

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

  

 

 

 

 

 

 

 

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