On-Board Diagnosis System II - Volkswagen Technical Site

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<strong>System</strong> Components (Gasoline Engine) Activated charcoal filter system solenoid valve 1 N80 Installation position: located near to the air filter housing/suspension strut. It controls ventilation of the activated charcoal canister in the intake manifold and is colored black. In the deenergized state, it is closed. Electrical circuit 175_080 N80 + 175_081 38
Leak diagnosis 1 2 4 3 5 175_085 Legend: 1 Motronic control unit 2 Activated charcoal filter system solenoid valve 1 3 Activated charcoal canister 4 Fuel system diagnosis pump 5 Filter for diagnosis pump The leak diagnosis is carried out for New Beetle (U.S.A.) as part of OBD <strong>II</strong>. It is based on the overpressure method and indicates leaks with diameters greater than 1 mm. For the diagnosis cycle, the tank system is disconnected from the intake pipe vacuum by activated charcoal filter system solenoid valve 1. The fuel system diagnosis pump then builds up a defined excess pressure. The engine management system checks how quickly the pressure drops in the tank system to determine the leaktightness of the system. 39
Page 1 and 2: Service. Self-Study Program 175 On-
Page 3 and 4: Contents OBD Variants . . . . . . .
Page 5 and 6: Gasoline engine monitoring function
Page 7 and 8: Requirements: ● Standardized diag
Page 9 and 10: Glossary: CARB (California Air Reso
Page 11 and 12: OBD-II Diagnosis Stored malfunction
Page 13 and 14: Fault indication by self-diagnosis
Page 15 and 16: 1. Connect diagnosis system to diag
Page 17 and 18: Here is an example The Motronic con
Page 19 and 20: System components 2.0-liter gasolin
Page 21 and 22: Actuators Motronic control unit J22
Page 23 and 24: Catalytic exhaust gas treatment NO
Page 25 and 26: Hazards to the catalytic converter
Page 27 and 28: Functional description The differen
Page 29 and 30: Testing and adaption of the voltage
Page 31 and 32: Heated lambda probe Advantages: Sin
Page 33 and 34: The OBD II checks: ● Flow rate at
Page 35 and 36: The tank ventilation system 2 1 3 1
Page 37: The OBD II checks: ● The function
Page 41 and 42: Diagnosis of a major leak If the fr
Page 43 and 44: Function Normal and ventilation pos
Page 45 and 46: The OBD II checks: Fuel system diag
Page 47 and 48: 180° G28 Crank disk Direction of r
Page 49 and 50: Engine speed sender G28 This induct
Page 51 and 52: Throttle valve potentiometer G69 Th
Page 53 and 54: Air-mass flow meter G70 175_121 G70
Page 55 and 56: The OBD II checks: ● the electric
Page 57 and 58: Motronic control unit J220 (M5.9.2)
Page 59 and 60: Notes 59
Page 61 and 62: Emission limits for diesel vehicles
Page 63 and 64: 09 15 10 11 07 08 12 14 13 16 175_1
Page 65 and 66: Diesel direct injection system cont
Page 67 and 68: Injection commencement control To o
Page 69 and 70: Commencement of injection valve N10
Page 71 and 72: The OBD II checks: ● the opening
Page 73 and 74: The misfire detection system 1 2 Cy
Page 75 and 76: Charge pressure control solenoid va
Page 77 and 78: Accelerator position sender G79 Thi
Page 79 and 80: Reading out the Readiness Codes The
Page 81 and 82: Example of display on diagnosis sys
Page 83 and 84: OBD-II (diesel) Diagnosis for diese
Page 85 and 86: N152 + A B C J220 Input signal Outp
Page 87 and 88: G28 G80 A B C D J248 Input signal O
Page 89 and 90:
5. What statements on executing a s
Page 91 and 92:
Notes 91
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On-Board Diagnosis System II - Volkswagen Technical Site

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