Volkswagen New Beetle. Manual - part 1430

Fig. 54: V.A.G 1551 Scan Tool Display - Checking EVAP System For Leak (7 Of 11) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

The Leak detection pump V144- switches off and the control module measures the time until the reed contact 
closes. 

Indicated on display 

Fig. 55: V.A.G 1551 Scan Tool Display - Checking EVAP System For Leak (8 Of 11) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Check display in display zones 3 and 4: specified value display field 3: Check. END Specified value 
display field 4: Syst. OK  

DISPLAY IN DISPLAY ZONE CHECK 

-

Display zones

1

2

3

4

Display group 71: Diagnosis of Evaporative Emission (EVAP) system (leak detection)

Display

Reed closed 

Reed open

Small leak/large leak 

Abort

Syst. Test 

Check 

Check end

Test OFF/Test ON

Syst. OK

Syst. not OK

Indicated

Condition Reed contact

Malfunction message

System condition

Result

Working 
range

-

-

-

-

Specified 

Reed open

-

Messg. END

Syst. OK

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Fuel System - New Beetle, 1.8L (APH, AWV & AWP)

  

If the specifications are obtained: 

z

Press --> button.  

z

Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.  

z

Switch ignition off.  

If the specifications are not attained: 

z

Press buttons -0- and -8- for "Read Measuring Value Block" function and confirm entry with Q button.  

Indicated on display 

Fig. 56: V.A.G 1551 Scan Tool Display - Checking EVAP System For Leak (9 Of 11) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Press buttons -0-, -7- and -0- for "Display group number 70" and confirm entry with -Q- button.  

Indicated on display: (1-4 = Display zones) 

value

If a malfunction message 

is indicated: 

See CHECKING FOR 

LEAKS checking for 

leaks

If the specifications are not obtained: Check DTC memory, 
See Diagnostic Trouble Code (DTC) Memory, Checking 
And Erasing

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Fuel System - New Beetle, 1.8L (APH, AWV & AWP)

  

Fig. 57: V.A.G 1551 Scan Tool Display - Checking EVAP System For Leak (10 Of 11) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

z

Press button -4- for "Basic setting" function ("Tank venting valve diagnosis" will be initiated).  

Indicated on display: (1-4 = Display zones) 

NOTE:

The engine must not be loaded during this diagnosis because the diagnosis will 
be interrupted and will not be started again until the engine is revved-up.

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Fuel System - New Beetle, 1.8L (APH, AWV & AWP)

  

Fig. 58: V.A.G 1551 Scan Tool Display - Checking EVAP System For Leak (11 Of 11) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

When the diagnosis is initiated by the Engine Control Module, the display in display zone 4 jumps from "Test 
OFF" to "Test ON." 

z

Run engine at idling speed until specification "EVAP OK" is displayed in display zone 4.  

DISPLAY IN DISPLAY ZONE CHECK 

NOTE:

If the display jumps from "Test ON" to "Test OFF" during the test, rev up briefly 
and the test will be repeated.

-

Display zones

1

2

3

4

Display group 70: Evaporative Emission (EVAP) system diagnosis (tank venting system)

Display

xxx.x %

xxx.x %

xxx %

Test OFF/Test ON

EVAP

(1)

 OK

EVAP not OK

Indicated

Opening of EVAP canister 

purge regulator valve 

during diagnostic

oxygen sensor 

control value 

Bank 1

Condition of EVAP 

canister purge regulator 

valve 

(relative EVAP -

specification)

Diagnostic 

condition and 

Diagnostic result

Working 

0.0-100.0%

-100.0-100.0%

0-199%

-

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE Fuel System - New Beetle, 1.8L (APH, AWV & AWP)