Section 70 (On Board Diagnostic (OBD) - 2.8L VR6, AAA (A3 Platform))
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- On Board Diagnostic (OBD II)
- VAG 1551 Scan Tool (ST), connecting and selecting "Engine Electronics" address word 01
- Special tools, testers and auxiliary items
- Test conditions
- Work sequence
- Code Control Module (scan tool function 07)
- Check DTC Memory (scan tool function 02)
- Diagnostic Trouble Code (DTC) table
- Erase DTC memory (scan tool function 05)
- Readiness code, reading (scan tool function 15)
- Readiness code, creating
- Notes
- Special tools, testers and auxiliary items
- Test sequence
- Work step: 1
- Work step: 2
- Work step: 3 Diagnostic test: Engine warm -up
- Work step: 4
- Work step: 5 Diagnostic test: Oxygen Sensor (O2S) aging (regulating frequency extended)
- Work step: 6 Diagnostic test: Fuel adaptation under partial throttle
- Work step: 7 Diagnostic test: Fuel adaptation during closed throttle position
- Work step: 8 Diagnostic test: Secondary Air Injection (AIR) system
- Work step: 9 Diagnostic test: Oxygen Sensor (O2S) aging (regulating frequency extended)
- Work step: 10 Diagnostic test: Three Way Catalytic Converter (TWC)
- Work step: 11 Diagnostic test: Fuel tank vent system (EVAP canister purge regulator valve)
- Work step: 12
- Work step: 13 Diagnostic test: Vehicle Speed Sensor (VSS)
- Work step: 14, Diagnostic test: Knock Sensors (KS)
- Work step: 15, Diagnostic test: Heated Oxygen Sensor (HO2S) before three way catalytic converter
- Work step: 16, Diagnostic test: Heated Oxygen Sensor (HO2S) after three way catalytic converter
- Work step: 17, Diagnostic test: Oxygen Sensor (O2S) heating (before three way catalytic converter)
- Work step: 18, Diagnostic: Throttle valve control module
- Work step: 19
- Output Diagnostic Test Mode (DTM) (scan tool function 03)
- Read measuring value block (scan tool function 08)
- VAG 1551 Scan Tool (ST), connecting and selecting "CARB/OBD II" address word 33