Volkswagen New Beetle. Manual - part 1465

 

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Volkswagen New Beetle. Manual - part 1465

 

 

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Contact 5 + socket 33  

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Wire resistance: max. 1.5 ohms  

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Additionally check wiring for short to battery positive or Ground.  

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Additionally check wires for short to one another. 

If no wiring malfunction is detected: 

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Replace Throttle Position (TP) sensors -G79- and -G185-. See ELECTRONIC ENGINE POWER 
CONTROL (EPC) WARNING LAMP IN INSTRUMENT CLUSTER, SIGNIFICANCE
 , item 4.  

Vehicles with automatic transmission 01M 

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Adapt control module for automatic transmission: 

See BASIC SETTING, INITIATING . 

Continued for all vehicles 

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Check DTC memory: 

See Diagnostic Trouble Code (DTC) Memory, Checking And Erasing . 

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Read readiness code: 

See Readiness Code, Displaying . 

If the DTC memory has been erased or the engine control module separated from the permanent positive, 
the readiness code must be generated again. 

See Diagnostic Trouble Code (DTC) Memory, Checking And Erasing . 

EVAPORATIVE EMISSION (EVAP) SYSTEM 

FUNCTIONAL DESCRIPTION OF LEAK DETECTION 

Depending upon the air pressure and ambient temperature, fuel vapor will form above the level of fuel in the 
tank. 

The Evaporative Emission (EVAP) system prevents these HC emission escaping to the atmosphere. 

In limited quantities, fuel vapors pass through a gravity valve (which closes at an angle of 45°) located at the 
highest point in the tank and through a pressure retention valve into the activated charcoal filter in the EVAP 
canister. 

The activated charcoal stores these vapors like a sponge.

 

2003 Volkswagen New Beetle GLS 

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

  

When the oxygen sensor control is active when driving (engine warm), the EVAP canister purge regulator valve 
-N80- is activated (pulsed) from the Engine Control Module depending upon load and engine speed. The 
opening period is dependent on the input signals. 

Intake manifold vacuum draws fresh air through the vent opening on the underside of the EVAP canister during 
the purging procedure (regenerating the activated charcoal). The fuel vapors stored in the activated charcoal and 
fresh air are pulse-fed for combustion. 

The pressure retention valve prevents fuel vapors from being drawn from the tank when the solenoid valve is 
open and intake manifold vacuum is present. It therefore ensures that the evacuation of the EVAP canister has 
priority. 

No voltage (e.g. wiring open circuit) the solenoid valve is closed and the EVAP canister will not be purged. 

The vacuum line from the throttle valve control part to the EVAP canister has an additional by-pass which is 
connected with the crankcase breather valve. The non-return valve integrated in the crankcase breather valve 
prevents the intake air gassing into the crankcase during some partial load ranges. This improves the overall 
crankcase breathing. The by-pass guarantees the crankcase breathing. 

Functional description of leak detection 

The Evaporative Emission (EVAP) system (including fuel tank) is equipped with a leak detection which will 
detect whether the system is leaking. 

The diagnosis operates by pressurizing the system and should detect leaks where the damage exceeds 1 mm in 
diameter. 

During the diagnosis the Leak detection pump -V144- builds up a pressure of approx. 30 mbar in the 
Evaporative Emission (EVAP) system. The pump will switch off when the pressure is attained. When the 
pressure falls to below a certain figure, the pump will switch on again. The On Board Diagnostic monitors the 
time between the switched on periods, and if it is too short it will register a malfunction in the DTC memory. 

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Observe safety precautions. See SAFETY PRECAUTIONS WHEN WORKING ON FUEL SUPPLY 
SYSTEM
 .  

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Observe rules for cleanliness. See RULES OF CLEANLINESS .  

Overview of EVAP canister system. See EVAPORATIVE EMISSION (EVAP) SYSTEM, OVERVIEW . 

EVAPORATIVE EMISSION (EVAP) SYSTEM COMPONENTS, SERVICING 

NOTE:

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Hose connections are secured with either spring-type or clamp-type clips. 

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Always replace clamp-type clips with screw-type clips.  

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Assembly tool VAS 5024 or hose clip pliers VAG 1921 are recommended 
for installing spring-type clips.  

 

2003 Volkswagen New Beetle GLS 

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

  

1. Leak detection pump (LDP) -V144- */** 

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at EVAP canister  

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In right rear wheel well  

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Checking. See LEAK DETECTION PUMP (LDP) -V144-, CHECKING  

2. Connector 

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3 pin  

3. Vacuum pipe 

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To throttle valve control module. See EVAP CANISTER PURGE REGULATOR VALVE -
N80-, CHECKING
 , Pos. 15  

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Press together at front to release  

4. Vent pipe 

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From changeover valve on fuel tank. See CHECKING FUEL PUMP NON-RETURN VALVE , 
item 10  

5. To Evaporative Emissions (EVAP) Canister Purge Regulator Valve -N80- 

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In engine compartment, right at side piece. See EVAP CANISTER PURGE REGULATOR 
VALVE -N80-, CHECKING
 , Pos. 17  

6. EVAP canister 

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In rear right wheel well behind wheel housing liner  

7. 10 N.m  

8. 3 N.m  

9. Air cleaner for leak detection pump  

10. Connecting hose 

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Suction side  

11. Connecting hose 

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Pressure side  

NOTE:

The following list refers to items in Fig. 36 .

 

2003 Volkswagen New Beetle GLS 

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

  

Fig. 36: Identifying Evaporative Emission System Components
Courtesy of VOLKSWAGEN OF AMERICA, INC.
 

EVAPORATIVE EMISSION (EVAP) SYSTEM, OVERVIEW 

1. Vacuum reservoir  

2. Pressure retaining valve 

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For fuel tank breathing  

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Checking. See Checking Pressure Retaining Valve  

3. Change-over valve 

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Checking. See Checking Change-Over Valve  

4. EVAP canister 

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In rear right wheel well behind wheel housing liner  

5. Leak detection pump (LDP) -V144- 

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At EVAP canister  

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Checking activation: 

See Output Diagnostic Test Mode (DTM), Initiating 

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Checking. See LEAK DETECTION PUMP (LDP) -V144-, CHECKING  

6. Air cleaner for leak detection pump  

7. Tank cap unit 

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With rubber cup  

8. Fuel tank 

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Support with engine and transmission jack VAG 1383 A when removing  

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Removing and installing. See FUEL TANK, REMOVING AND INSTALLING  

9. Fuel delivery unit 

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Removing and installing. See FUEL DELIVERY UNIT, REMOVING AND INSTALLING  

10. Check-valve 

NOTE:

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Components marked with an * are checked by the On Board Diagnostic 
(OBD). See Fig. 36 . 

See On Board Diagnostic (OBD) . 

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Components marked with ** are checked by the Output Diagnostic Test 
Mode (DTM). 

See Output Diagnostic Test Mode (DTM), Initiating . 

NOTE:

The following list refers to items in Fig. 37 .

 

2003 Volkswagen New Beetle GLS 

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

  

 

 

 

 

 

 

 

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