2.0L On Board Diagnostic (OBD) - Aba (A3 Platform)

• On Board Diagnostic (OBD II)
  • Function
  • Malfunction Indicator Lamp (MIL), significance
    • Notes
    • Functional check:
  • On Board Diagnostic (OBD), technical data
    • Control module identification
    • Equipment
    • Functions which can be selected when using the scan tools VAG 1551/1552 or VAS 5051
  • VAG 1551 Scan Tool (ST), connecting and selecting engine control module
    • Special tools and equipment
    • Test conditions
    • Work sequence
  • Vehicle Diagnostic, Testing and Information System VAS 5051, connecting and selecting engine control module
    • Notes
    • Test conditions
    • Work sequence
• Diagnostic Trouble Code (DTC) memory
  • Notes
  • DTC memory, checking and erasing (scan tool functions 02 and 05)
    • Special tools and equipment
    • Work sequence
  • Automatic test sequence
• Diagnostic Trouble Code (DTC) table: VAG codes and SAE P0 codes
• Diagnostic Trouble Code (DTC) table: VAG codes and SAE P1 codes
• Output Diagnostic Test Mode (DTM) (scan tool function 03)
  • Output Diagnostic Test Mode, initiating
  • Special tools and equipment
  • Test conditions
  • Work sequence
• Readiness code
  • Readiness code, function
  • Readiness code, displaying
    • Special tools and equipment
    • Work sequence
    • Significance of 8 digit number block for readiness code
  • Readiness code, generating
    • Special tools and equipment
    • Test conditions
    • Work sequence
    • Work step 1: Check DTC Memory
    • Work step 2: Erase DTC Memory
    • Work step 3: Matching throttle valve control module to engine control module
    • Work step 4: Temperature check
    • Work step 5: Diagnosis of leak detection system
    • Work step 6: EVAP system diagnosis (tank venting system)
    • Work step 7: Secondary air system diagnosis
    • Work step 8: Oxygen sensor aging diagnosis (cycle duration monitor)
    • Work step 9: Catalyst diagnosis
• Read Measuring Value Block (scan tool function 08)
  • Safety precautions
  • Read Measuring Value Block, initiating
    • Notes
    • Test conditions
    • Work sequence
  • Measuring value blocks, display groups 0 to 9 (Basic Function), evaluating
    • Display group 1 -Basic functions-
    • Display group 2 -Basic functions- Mass air flow sensor
    • Display group 3 -Basic function- Mass air flow sensor
    • Display group 4 -Basic functions-
    • Display group 5 -Basic functions-
    • Display group 6 -Basic function-
  • Measuring value blocks, display groups 10 to 29, 212 (ignition), evaluating
    • Display group 10 -Ignition-
    • Display group 14 -Ignition- Misfire recognition
    • Display group 22 -Ignition- Knock control
    • Display group 23 -Ignition- Knock control
  • Measuring value blocks, display groups 30 to 40, 99 (Oxygen sensor control), evaluating
    • Display group 30 -Oxygen sensor control-
    • Display group 32 -Oxygen sensor control- Oxygen sensor learned values
    • Display group 33 -Oxygen sensor control- Oxygen sensor control values
    • Display group 34 -Oxygen sensor control- Oxygen sensor diagnosis before catalytic converter (checking age via cycle duration monitoring)
    • Display group 36 -Oxygen sensor control- Operational readiness of probe after catalytic converter
    • Display group 37 -Oxygen sensor control- Operational readiness of probe after catalytic converter-
    • Display group 41 -Oxygen sensor control- Oxygen sensor heating
    • Display group 46 -Oxygen sensor control- Catalyst diagnosis (conversion test)
    • Display group 99 -Oxygen sensor control- Oxygen sensor control operating condition
  • Measuring value blocks, display groups 50 to 69 (speed regulation), evaluating
    • Display group 50 -Speed regulation- Operating condition
    • Display group 54 -Speed regulation- Operating condition
    • Display group 55 -Speed regulation- Idling stabilization
    • Display group 56 - Speed regulation- Idling speed stabilization
    • Display group 60 -Speed regulation- Throttle valve control module adaption
  • Measuring value blocks, display groups 70 to 79 (reducing emissions), evaluating
    • Display group 70 -Reducing emissions- EVAP system diagnosis (fuel tank venting system)
    • Display Group 77 - Reducing Emissions (Secondary Air System Diagnosis)
  • Measuring value blocks, display groups 80 to 100 (readiness code), evaluating
    • Notes
    • Significance of 8 digit number block for readiness code