On-Board Diagnosis System II - Volkswagen Technical Site

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<strong>System</strong> Components (Gasoline Engine) Secondary air inlet valve N112 This electrical change-over valve is attached to the engine bulkhead. It controls the combination valve via a vacuum line and is activated directly by the Motronic control unit. 175_071 Effects of signal failure If the control unit pulse signal fails, the combination valve can no longer open. The secondary air pump cannot inject any air. Electrical circuit N112 + 175_072 Secondary air pump relay J299 is activated by the Motronic control unit to switch the secondary air pump motor. Electrical circuit + J299 + V101 175_074 175_073 Secondary air pump motor V101 is activated via a relay. The secondary air pump motor delivers the air mass flow for the secondary air system. Electrical circuit J299 175_075 V101 175_076 34
The tank ventilation system 2 1 3 175_077 Legend: 1 Motronic control unit 2 Activated charcoal filter system solenoid valve 1 3 Activated charcoal canister The tank ventilation system should prevent hydrocarbons escaping into the atmosphere. Therefore, the gasoline vapors which form on the surface of the fuel inside the tank are accumulated in an activated charcoal canister and fed into the intake manifold via a solenoid valve while the engine is running. The leak testing function can be added to the fuel tank purging system. 35
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: The OBD II checks: ● Flow rate at
Page 37 and 38: The OBD II checks: ● The function
Page 39 and 40: Leak diagnosis 1 2 4 3 5 175_085 Le
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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