Section 136 (On Board Diagnostic (OBD) - 4.2L V8 (AKB, Aux, AYS))
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 Audi S8, 2003 Audi A8, 2002 Audi S8, 2002 Audi A8, and 2001 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
- On Board Diagnostics (OBD)
- Motronic system, On Board Diagnostic (OBD)
- On Board Diagnostic, technical data
- Available functions
- Exhaust Malfunction Indicator Light (MIL), significance
- Vehicle diagnostic, testing and information system VAS5051 or VAG1551, connecting and selecting functions
- Diagnostic Trouble Code (DTC) Memory, checking and erasing
- Diagnostic Trouble Code (DTC) table
- Output Diagnostic Test Mode (DTM) (function 03) (engine codes AUX, AKB)
- Notes
- Test requirements
- Notes
- Actuating EVAP Canister Purge Regulator Valve -N80-
- Actuating Secondary Air Injection (AIR) Solenoid Valve -N112-
- Actuating Secondary Air Injection (AIR) Pump Relay -J299-
- Actuating Intake Manifold Change -Over Valve -N156-
- Actuating camshaft adjustment valves -N205-, -N208-
- Actuating Leak Detection Pump (LDP) -V144-
- Actuating Intake Manifold Tuning (IMT) Valve 2 -N261-
- Checking left and right engine mount
- Actuating fuel injectors
- Output Diagnostic Test Mode (DTM) (function 03) (engine code AYS)
- Notes
- Test requirements
- Notes
- Evaporative Emission (EVAP) canister purge regulator valve -N80- (tank ventilation valve), activating
- Activating secondary Air Injection (AIR) solenoid valve -N112-
- Activating secondary Air Injection (AIR) pump relay -J299-
- Intake manifold change-over valve -N156-, activating
- Activating camshaft adjustment valve, bank 2
- Leak Detection Pump (LDP) -V144- (LDP for tank ventilation system), activating
- Activating intake manifold tuning (IMT) valve 2 -N261-
- Checking left and right engine mount
- Activating camshaft adjustment valve, bank 1
- Activating fuel injectors
- Basic setting
- Code control module (function 07) (engine codes AUX, AKB)
- Code control module (function 07) (engine code AYS)
- Read Measuring Value Block
- Readiness code
- Readiness code, checking
- Readiness code, generating
- Required special tools and test equipment
- Requirements
- Work step 1: Check DTC memory
- Work step 2: Erase DTC Memory
- Work step 3: Diagnostic of EVAP canister purge regulator valve
- Work step 4: Diagnostic of tank leak test
- Work step 5: Diagnostic of fuel supply system
- Work step 6: Diagnostic of Heated oxygen sensor
- Work step 7: Diagnostic of oxygen sensor before catalytic converter
- Work step 8: Diagnostic of operational readiness of oxygen sensors behind TWC
- Work step 9: Diagnostic of oxygen sensor control system
- Work step 10: Diagnostic of oxygen sensor aging behind catalytic converter
- Work step 11: Diagnosis of catalytic converter
- Work step 12: Diagnosis of Secondary Air Injection (AIR) system
- Work step 13: Readiness code, displaying
- Motronic system, On Board Diagnostic (OBD)