OBD Monitors / Modes

OBD Monitors / Modes

The 12 step system monitoring requirements or
- Catalyst
- Heated Catalyst
- Misfire and Misfire for Diesels
- Evaporative System
- Secondary Air System
- Air Conditioning System Refigerant
- Fuel System
- Oxygen System
- Exhaust Gas Recirculation (EGR) System
- Positive Crankcase Ventialtion (PCV) System
- Thermostat
- Comprehensive Component

Mercedes-Benz SDS-tool is used for diagnosis.
Generic Tools may not have same functionality.

SAE Requirements J1979:
Mode #1 - Current powertrain diagnostic data including: engine parameters, MIL status and readiness codes
Mode #2 - Powertrain freeze frame data
Mode #3 - Emission-related powertrain diagnostic trouble codes (DTCs)
Mode #4 - Clear/Reset emission-related diagnostic information including MIL status, DTCs, freeze frame and readiness codes
Mode #5 - Oxygen sensor monitor test results
Mode #6 - On-board monitoring test results for non-continuous monitor systems (i.e., catalyst, exhaust gas re-circulation (EGR), evaporative system, etc.)
Mode #7 - On-board monitoring test results for continuous monitor systems (i.e., fuel trim, misfire, comprehensive components)