Volkswagen New Beetle. Manual - part 1322

 

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Volkswagen New Beetle. Manual - part 1322

 

 

Fig. 50: Connecting VAG1598/22 (Or 1598/31) Test Box To ECM Wiring Harness 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Check wiring for open circuit between Test Box and 4-pin harness connector using Wiring diagram. 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 51: Identifying ECT Sensor Harness Connector Terminals 1 And 3 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Up to MY 1999 

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Terminal 1 + socket 70  

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Terminal 3 + socket 54  

From MY 2000 

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Terminal 3 + socket 112  

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Terminal 4 + socket 104  

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Wire resistance: 1.5ohm maximum  

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Check wires for shorting to: one another, Ground and Battery + 

 

2003 Volkswagen New Beetle GLS 

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

  

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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

  

 

 

 

 

 

 

 

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