General

General

Requirements For The OBD II System:
- Monitoring the efficiency of the catalytic converter.
- Recognition of combustion misfiring.
- Monitoring of the tank ventilation system.
- Monitoring the tank system for leaks.
- Monitoring of the secondary air injection.
- Monitoring the adaptation limitation of the oxygen sensing system.
- Monitoring the oxygen sensors.
- Monitoring of other emission relevant components (former OBD I scope).
- Triggering the Malfunction Indicator Lamp (MIL or Check Engine) and storing faults in the memory.
- Protection against manipulation of control modules.
- Indication of monitoring readiness (Ready Code).
- Displaying the Diagnostic Trouble Code.
- Storing of operation parameters in the event of a fault (freeze frame).
- Functional checks of the OBD system (trip, warm-up cycle, driving cycle).
- Standardized control module tester (generic scan tool).
- Standardized read out of operating data such as rpm, temperature, etc.

Ambient conditions

Three ambient (operating) conditions can be stored with each fault. These can be:
- Engine load
- Engine temperature
- Engine rpm
- Intake air temperature
- Voltage supply
- Throttle valve angle
- Tank level
- Vehicle speed