Volkswagen New Beetle. Manual - part 1338

 

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Volkswagen New Beetle. Manual - part 1338

 

 

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

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Specification: INFINITY ohm  

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Correct any open/short circuit as necessary.  

If no open or short circuits exist: 

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Replace Engine Control Module.  

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Display the Readiness code. See READINESS CODE, DISPLAYING .  

If DTC memory was erased: 

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Set the readiness code. See READINESS CODE, SETTING .  

Mass Air Flow (MAF) Sensor -G70-, checking 

ECM uses MAF Sensor -G70- signal to calculate injection quantity and for regulating EGR. The smaller the -
G70- signal; the smaller the quantity of injected fuel. 

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 and start 
engine and let idle.  

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

Display will appear as shown (example only):

WARNING:

For safe operation, use a second technician to operate test equipment 
and take readings from back seat, during test drive.

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 118: Scan Tool Display - Mass Air Flow Sensor (1 Of 7) 
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. 119: Scan Tool Display - Mass Air Flow Sensor (2 Of 7) 
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. 120: Scan Tool Display - Mass Air Flow Sensor (3 Of 7) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press -0-, -1- and -0- buttons to select "Display group 10".  

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Observe display in Display zone 1.  

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Specified Value: 200 to 450 mg/H 

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 121: Scan Tool Display - Mass Air Flow Sensor (4 Of 7) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

If specification not obtained: 

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Check Exhaust Gas Recirculation system  

See EXHAUST GAS RECIRCULATION (EGR), CHECKING . 

If specification obtained: 

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Accelerate vehicle in 3rd gear from about 1500 RPM under Wide Open Throttle (WOT).  

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Press PRINT button on VAG1551 at approx. 3000 RPM.  

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Specification in Display zone 4: 100% (Throttle position) 

 

2003 Volkswagen New Beetle GLS 

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

  

 

 

 

 

 

 

 

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