Diagnosis Description: Description

An OBD (on-board diagnosis) system of the second generation uses OBD II. In Europe, the OBD II, with appropriate adaptation for the European market, is called European On-Board Diagnosis (EOBD).

The OBD system is integrated in the ECM and constantly monitors all emissions-relevant components and systems of the vehicle.

The OBD has the following tasks:

• Monitor emissions- relevant components and systems while traveling
• Identify and store malfunctions
• Display of malfunctions via the engine diagnosis indicator lamp (Malfunction Indicator Lamp)
• Detected faults are transmitted over a uniform interface (diagnostic connector) to a diagnostic unit (e.g. CONSULT)

OBD follows the list as below:

• Ensuring permanently low exhaust emissions
• Protect components at risk (such as catalytic converters) against backfires

The following components and systems are monitored:

• Catalytic converter heating
• Smooth running analysis (recognition of combustion misfire)
• Oxygen sensors
• Purge control
• Smooth running control
• Other components which related to emission or which can cause malfunction in the diagnosis of other components.
• Efficiency of the CAT (catalytic converter function)