Self Diagnosis - Theory & Operation (N54)

• Diagnostic Trouble Code Index
• 1.1 Catalyst Monitoring
  • Notes
  • 1.1.1 Diagnostic overview
  • 1.1.2 Monitoring function
  • 1.1.3 Validation of the calculated sensor signals (O2_cat_i) of one period
• 1.2 Heated Catalyst Monitoring
• 1.3 Misfire Monitoring
  • Notes
  • 1.3.1 Monitoring function
  • 1.3.2 Statistics, fault processing
• 1.4 Evaporative - System
  • 1.4.1 EVAP - Functional check canister purge solenoid (CPS)
    • Notes
    • 1.4.1.1 Monitoring function
  • 1.4.2 EVAP system leak measurement (Module DM-TL)
    • Notes
    • 1.4.2.1 Monitoring function - Leak detection
    • 1.4.2.2 Diagnosis Frequency and MIL illumination
  • 1.4.3 EVAP pump current (Comprehensive Component, appending to EVAP)
    • 1.4.3.1 Monitoring function - Pump current diagnosis
• 1.5 Secondary Air System Monitoring
• 1.6 Fuel System Monitoring
  • 1.6.1 Lambda adaptation
    • Notes
    • 1.6.1.1 Monitoring function
  • 1.6.2 Trim Control Plausibility Monitoring
    • Notes
    • 1.6.2.1 Monitoring function
  • 1.6.3 Diagnosis of Injector Aging
    • Notes
    • 1.6.3.1 Monitoring function
  • 1.6.4 Injection Deactivation
    • Notes
    • 1.6.4.1 General description
  • 1.6.5 High Pressure Fuel Control System
    • Notes
    • 1.6.5.1 Monitoring function
    • 1.6.5.2 Monitoring function - Pressure Range Check
    • 1.6.5.3 Monitoring function - Pressure Range Check during start
  • 1.6.6 Fuel Regulators/Valves/Sensors (Comprehensive Component, appending to Fuel System)
  • 1.6.7 Fuel Level Sensor (FLS) (Comprehensive Component, appending to Fuel System)
    • 1.6.7.1 Monitoring overview
    • 1.6.7.2 FLS electrical circuit continuity check
      • Notes
      • 1.6.7.2.1 Monitoring function
      • 1.6.7.2.2 FLS diagnosis frequency of FLS circuit continuity check
    • 1.6.7.3 FLS signal correlation check
      • Notes
      • 1.6.7.3.1 Monitoring function
      • 1.6.7.3.2 FLS diagnosis frequency of FLS correlation check
• 1.7 Oxygen Sensor Monitoring linear upstream/binary downstream
  • 1.7.1 Upstream Oxygen Sensor Monitoring (linear)
    • 1.7.1.1 Upstream Oxygen Sensor - Short Circuit Monitoring
      • Notes
      • 1.7.1.1.1 Monitoring function
    • 1.7.1.2 Upstream Oxygen Sensor - Open Circuit Monitoring
      • Notes
      • 1.7.1.2.1 Monitoring function
      • 1.7.1.2.2 Monitoring description
    • 1.7.1.3 Upstream Oxygen Sensor - Signal Controller Monitoring
      • Notes
      • 1.7.1.3.1 Monitoring function
    • 1.7.1.4 Upstream Oxygen Sensor - Signal Activity Check
      • Notes
      • 1.7.1.4.1 Monitoring function
    • 1.7.1.5 Upstream Oxygen Sensor - Swapped Sensors Check
      • Notes
      • 1.7.1.5.1 Monitoring description
    • 1.7.1.6 Upstream Oxygen Sensor - Active Signal Check (Shift to lean/rich)
      • Notes
      • 1.7.1.6.1 Monitoring description
    • 1.7.1.7 Upstream Oxygen Sensor - Signal Dynamic Monitoring (Slow Response)
      • Notes
      • 1.7.1.7.1 Monitoring function
    • 1.7.1.8 Upstream Oxygen Sensor - Signal Monitoring During DFCO (Deceleration fuel cut off)
      • Notes
      • 1.7.1.8.1 Monitoring function
    • 1.7.1.9 Upstream Oxygen Sensor - Heater Monitoring
      • Notes
      • 1.7.1.9.1 Diagnostic overview
      • 1.7.1.9.2 Monitoring function
    • 1.7.1.10 Upstream Oxygen Sensor - Heater Circuit Monitoring
      • Notes
      • 1.7.1.10.1 Monitoring function
  • 1.7.2 Downstream Oxygen Sensor Monitoring (binary)
    • 1.7.2.1 Downstream Oxygen Sensor - Circuit Monitoring
      • Notes
      • 1.7.2.1.1 Monitoring function
    • 1.7.2.2 Downstream Oxygen Sensor - Signal Dynamic Check during Deceleration Fuel Cut-off (DFCO)
      • Notes
      • 1.7.2.2.1 Monitoring function
    • 1.7.2.3 Downstream Oxygen Sensor - Dynamic/Transition Time in Sensor Midpoint Range Monitoring
      • Notes
      • 1.7.2.3.1 Monitoring function
    • 1.7.2.4 Downstream Oxygen Sensor - Signal Activity Check
      • Notes
      • 1.7.2.4.1 Monitoring function
    • 1.7.2.5 Downstream Oxygen Sensor - Signal Check (Stuck lean/rich, Swap)
      • Notes
      • 1.7.2.5.1 Monitoring function
    • 1.7.2.6 Downstream Oxygen Sensor - Heater Plausibility Monitoring
      • Notes
      • 1.7.2.6.1 Monitoring function
    • 1.7.2.7 Downstream Oxygen Sensor - Heater Circuit Monitoring
      • Notes
      • 1.7.2.7.1 Monitoring function
• 1.8 Exhaust Gas Recirculation (EGR) System Monitoring
• 1.9 Positive Crankcase Ventilation (PCV) System
• 1.10 Engine Cooling System Monitoring
  • 1.10.1 Thermostat
    • Notes
    • 1.10.1.1 Monitoring function
  • 1.10.2 Engine Coolant Temperature (ECT) Monitoring
    • 1.10.2.1 Engine Coolant Temperature (ECT) Diagnosis - Electrical check
      • Notes
      • 1.10.2.1.1 Monitoring function
    • 1.10.2.2 Engine Coolant Temperature (ECT) Gradient Diagnosis
      • Notes
      • 1.10.2.2.1 Monitoring function
    • 1.10.2.3 Engine Coolant Temperature (ECT) Stuck Diagnosis
      • Notes
      • 1.10.2.3.1 Monitoring function
    • 1.10.2.4 Engine Coolant Temperature (ECT) Stuck in Range Diagnosis
      • Notes
      • 1.10.2.4.1 Monitoring function
  • 1.10.3 Engine off Timer (EOT) Monitoring
    • Notes
    • 1.10.3.1 Monitoring function
• 1.11 Cold Start Emission Reduction Strategy Monitoring
• 1.12 Air Conditioning (A/C) System Component Monitoring
• 1.13 Camshaft and Crankshaft Sensor including Valve Timing
  • 1.13.1 Camshaft Sensor
    • 1.13.1.1 Variable Camshaft Timing (Vanos) (detection of mechanical IVVT error)
      • Notes
      • 1.13.1.1.1 Monitoring function
    • 1.13.1.2 Camshaft Position Sensor (CMP)
      • Notes
      • 1.13.1.2.1 Monitoring function
      • 1.13.1.2.2 Diagnosis of signal plausibility
      • 1.13.1.2.3 Diagnosis of period length
      • 1.13.1.2.4 Diagnosis of synchronization state
      • 1.13.1.2.5 Diagnosis of mechanical reference position
      • 1.13.1.2.6 Diagnosis of mechanical chain jump
    • 1.13.1.3 Camshaft Crankshaft synchronization
      • Notes
      • 1.13.1.3.1 Monitoring function
  • 1.13.2 Crankshaft Position Sensor (CRK)
    • Notes
    • 1.13.2.1 Monitoring function
• 1.14 Comprehensive Component Monitoring OBD II Siemens VDO function definition
  • 1.14.1 Strategy
    • Notes
    • 1.14.1.1 Monitoring Strategy for sensors
    • 1.14.1.2 Monitoring Strategy for actuators
    • 1.14.1.3 Rationality Check
  • 1.14.2 Ambient Air Temperature (AAT) Monitoring
    • 1.14.2.1 CAN based Ambient Air Temperature - Signal Diagnosis
      • Notes
      • 1.14.2.1.1 General description
    • 1.14.2.2 Ambient Air Temperature - Signal Plausibility Check
      • Notes
      • 1.14.2.2.1 General description
  • 1.14.3 Intake Air Temperature (IAT) Monitoring
    • 1.14.3.1 Electrical Intake Air Temperature Diagnosis
      • Notes
      • 1.14.3.1.1 General description
    • 1.14.3.2 Intake Air Gradient Check
      • Notes
      • 1.14.3.2.1 General description
    • 1.14.3.3 Intake Air Plausibility Check
      • Notes
      • 1.14.3.3.1 General description
  • 1.14.4 Electronic Throttle Control Monitor (ETC)
    • 1.14.4.1 Electronic Throttle Control (ETC) Power Stage Diagnosis (H-bridge)
      • Notes
      • 1.14.4.1.1 General description
    • 1.14.4.2 Electronic Throttle Control (ETC) Adaption and Start Check
      • 1.14.4.2.1 ETC spring check (start routine)
      • 1.14.4.2.2 ETC adaptation diagnosis
    • 1.14.4.3 Electronic Throttle Control (ETC) Motor Control Performance
      • Notes
      • 1.14.4.3.1 General description
    • 1.14.4.4 Electronic Throttle Control (ETC) air supply rationality check
  • 1.14.5 Idle Speed Control (ISC) Actuator
    • 1.14.5.1 Idle Speed Control Rationality Diagnosis
      • Notes
      • 1.14.5.1.1 Monitoring function
  • 1.14.6 Manifold and Ambient Pressure (MAP + AMP)
    • 1.14.6.1 Manifold Pressure Throttle Position Sensor - Rationality check
      • Notes
      • 1.14.6.1.1 Monitoring function
    • 1.14.6.2 Manifold Pressure Sensor and Ambient Pressure - Rationality check
      • Notes
      • 1.14.6.2.1 Monitoring function
  • 1.14.7 Vehicle Speed Signal
    • 1.14.7.1 Vehicle speed sensor - signal plausibility check
      • Notes
      • 1.14.7.1.1 Monitoring function
    • 1.14.7.2 Vehicle speed sensor - signal check
      • Notes
      • 1.14.7.2.1 Monitoring function
  • 1.14.8 Knock Sensor
    • Notes
    • 1.14.8.1 General description
• 1.15 Listing of all ECM Input and Output Signals
• 1.16 Location of the Data Link Connector
  • 1.16.1 Location of the Data Link Connector for following models
  • 1.16.2 Location of the Data Link Connector for following models
• 1.17 Drawing and Location of the Malfunction Indicator Light
  • 1.17.1 Drawing and Location of the Malfunction Indicator Light for following models
• 1.18 Calculated load and fuel trim determination