Section 56 (On Board Diagnostic (OBD) - 1.9L TDI, 1Z & AHU (A3 Platform))
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, 1997 Volkswagen Passat, 1997 Volkswagen Jetta, and 1996 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
- On Board Diagnostic (OBD)
- Function
- Malfunction Indicator Lamp (MIL)
- Technical data
- VAG1551/VAG1552 scan tool, selectable functions
- VAG1551 Scan Tool (ST), connecting
- 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, displaying
- Readiness code, setting (up to m.y. 1997)
- Readiness code, setting (m.y. 1998 and above)
- Output Diagnostic Test Mode, checks
- Read Measuring Value Block (scan tool function 08)
- Measuring value blocks, evaluating
- Display group 000 at idle speed (engine coolant temperature at least 80° C or 176° F)
- Display group 001 at idle (engine coolant temperature at least 80 °C or 176 °F)
- Evaluation: Injected quantity display
- Evaluation: Modulating piston displacement sensor voltage display
- Display group 002 at idle (engine coolant temperature at least 80 °C or 176 °F)
- Evaluation: Accelerator pedal position display
- Evaluation: Operating condition display
- Display group 003 at idle (engine coolant temperature at least 80 °C or 176 °F)
- Evaluation: Specified mass of inducted air, display
- Evaluation: Actual mass of inducted air, display
- Display group 004 at idle (engine coolant temperature at least 80° C or 176° F)
- Evaluation: Start of injection display (specified)
- Evaluation: Start of injection display (actual)
- Display group 005
- Display group 006 with ignition switched ON
- Evaluation: Brake pedal monitor display
- Evaluation: Cruise control system display
- Display group 007 with ignition switched ON (engine cold and NOT running)
- Evaluation: Fuel temperature display
- Evaluation: Intake Air Temperature display
- Evaluation: Coolant temperature display
- Display group 009: Injected Quantity Limitation
- Display group 012: Glow Plug System
- Display group 013 at idle (engine warm, engine coolant temperature at least 80° C or 176° F)
- Idle speed smooth running control, display evaluation
- Display group 015: Fuel Consumption
- Display group 016 at idle: Additional Heater
- Evaluation: Additional heater display
- Evaluation: Heater element activation display
- Display group 000 at Wide Open throttle
- Display group 004 at Wide Open Throttle
- Evaluation: Start of injection (actual) display
- Evaluation: Cold start valve, duty cycle display
- Display group 008 at Wide Open Throttle
- Evaluation: Injected quantity (driver's requirement) display
- Evaluation: Injected quantity limitation via speed (torque limitation) display
- Evaluation: Injection quantity limitation due to inducted air mass (smoke prevention) display
- Display group 010 at Wide Open Throttle
- Evaluation: Inducted air mass, display
- Evaluation: Manifold Absolute Pressure (boost pressure), display
- Display group 011 at Wide Open Throttle
- Evaluation: Boost pressure display (actual)