Self Diagnosis - Theory & Operation (N54)

• Diagnostic Trouble Codes Index
• Catalyst Monitoring
  • Notes
  • Diagnostic overview
  • Monitoring function
• Heated Catalyst Monitoring
• Misfire Monitoring
  • Notes
  • Monitoring function
  • Statistics, fault processing
• Evaporative - System Leak Diagnosis (Module DM-TL)
  • EVAP system leak measurement
    • Notes
    • Monitoring function - Leak detection
    • Monitoring function - Pump current diagnosis
    • Diagnosis frequency and MIL illumination
  • EVAP - Functional check canister purge solenoid (CPS)
    • Notes
    • Monitoring function
• Secondary Air System Monitoring
• Fuel System Monitoring
  • Lambda adaptation
    • Notes
    • Monitoring function
  • Trim Control Plausibility Monitoring
    • Notes
    • Monitoring function
  • Diagnosis of Injector Aging
    • Notes
    • Monitoring function
  • High Pressure Fuel Control System
    • Notes
    • Monitoring function
• Oxygen Sensor Monitoring linear upstream / binary downstream
  • Upstream Oxygen Sensor Monitoring (linear)
    • Upstream Oxygen Sensor - Short Circuit Monitoring
      • Notes
      • Monitoring function
    • Upstream Oxygen Sensor - Open Circuit Monitoring
      • Notes
      • Monitoring function
      • Monitoring description
    • Upstream Oxygen Sensor - Signal Controller Monitoring
      • Notes
      • Monitoring function
    • Upstream Oxygen Sensor - Signal Activity Check
      • Notes
      • Monitoring function
    • Upstream Oxygen Sensor - Swapped Sensors Check
      • Notes
      • Monitoring description
    • Upstream Oxygen Sensor - Active Signal Check (Shift to lean / rich)
      • Notes
      • Monitoring description
    • Upstream Oxygen Sensor - Signal Dynamic Monitoring (Slow Response)
      • Notes
      • Monitoring function
    • Upstream Oxygen Sensor - Signal Monitoring During Fuel Cut-off
      • Notes
      • Monitoring function
    • Upstream Oxygen Sensor - Heater Monitoring
      • Notes
      • Diagnostic overview
      • Monitoring function
    • Upstream Oxygen Sensor - Heater Circuit Monitoring
      • Notes
      • Monitoring function
  • Downstream Oxygen Sensor Monitoring (binary)
    • Downstream Oxygen Sensor - Circuit Monitoring
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Signal Dynamic Check during Fuel Cut-off (DFCO)
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Dynamic / Transition Time in Sensor Midpoint Range Monitoring
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Signal Activity Check
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Signal Check (Stuck lean/rich, Swap)
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Heater Plausibility Monitoring
      • Notes
      • Monitoring function
    • Downstream Oxygen Sensor - Heater Circuit Monitoring
      • Notes
      • Monitoring function
  • Closed Loop Lambda Control - Enable conditions
• Exhaust Gas Recirculation (EGR) System Monitoring
• Positive Crankcase Ventilation (PCV) System
• Engine Cooling System Monitoring
  • Thermostat
    • Notes
    • Monitoring function
  • Engine Coolant Temperature (ECT) Monitoring
    • Electrical Engine Coolant Temperature Diagnosis - Electrical check
      • Notes
      • Monitoring function
    • Coolant Temperature Gradient Diagnosis
      • Notes
      • Monitoring function
    • Coolant Temperature Stuck Diagnosis
      • Notes
      • Monitoring function
    • Coolant Temperature Stuck in Range Diagnosis
      • Notes
      • Monitoring function
  • Engine off Timer Monitoring
    • Notes
    • Monitoring function
• Cold Start Emission Reduction Strategy Monitoring
• Air Conditioning (A/C) System Component Monitoring
• Camshaft and Crankshaft Sensor including Valve Timing
  • Camshaft Sensor
    • Variable Camshaft Timing (Vanos) (detection of mechanical IVVT error)
      • Notes
      • Monitoring function
    • Camshaft Position Sensor (CMP)
      • Notes
      • Monitoring function
      • Diagnosis of signal plausibility
      • Diagnosis of period length
      • Diagnosis of synchronization state
      • Diagnosis of mechanical reference position
      • Diagnosis of mechanical chain jump
    • Camshaft Crankshaft synchronization
      • Notes
      • Monitoring function
  • Crankshaft Position Sensor (CRK)
    • Notes
    • Monitoring function
• Comprehensive Component Monitoring OBD II Siemens VDO function definition
  • Strategy
    • Notes
    • Monitoring Strategy for sensors
    • Monitoring Strategy for actuators
    • Rationality Check
  • Fuel Level Sensor (FLS)
    • Monitoring overview
    • FLS electrical circuit continuity check
      • Notes
      • Monitoring function
      • FLS diagnosis frequency of FLS circuit continuity check
    • FLS signal rationality check (plausibility error)
      • Notes
      • Monitoring function
      • FLS diagnosis frequency of FLS rationality check (plausibility error)
  • Ambient Temperature Monitoring
    • CAN based Ambient Temperature - Signal Diagnosis
      • Notes
      • General description
    • Ambient Temperature - Signal Plausibility Check
      • Notes
      • General description
  • Intake Air Temperature (IAT) Monitoring
    • Electrical Intake Air Temperature Diagnosis
      • Notes
      • General description
    • Intake Air Gradient Check
      • Notes
      • General description
    • Intake Air Plausibility Check
      • Notes
      • General description
  • Electronic Throttle Control Monitor (ETC)
    • Electronic Throttle Control (ETC) Power Stage Diagnosis (H-bridge)
      • Notes
      • General description
    • Electronic Throttle Control (ETC) Adaption and Start Check
      • ETC spring check (start routine)
      • ETC adaptation diagnosis
    • Electronic Throttle Control (ETC) Motor Control Performance
      • Notes
      • General description
    • Electronic Throttle Control (ETC) air supply rationality check
  • ISC (Idle Speed Control) Actuator
    • Idle Speed Control Rationality Diagnosis
      • Notes
      • Monitoring function
  • Manifold Pressure
    • Manifold Pressure Throttle Position Sensor - Rationality check
      • Notes
      • Monitoring function
    • Manifold Pressure Sensor - Rationality check
      • Notes
      • Monitoring function
  • Vehicle Speed Signal
    • Vehicle speed sensor - signal plausibility check
      • Notes
      • Monitoring function
    • Vehicle speed sensor - signal check
      • Notes
      • Monitoring function
  • Knock Sensor
    • Notes
    • General description
  • Injection Deactivation
    • Notes
    • General description
• Listing of all ECM Input and Output Signals
• Location of the Data Link Connector
  • Location of the Data Link Connector for following models
• Drawing and Location of the Malfunction Indicator Light
  • Drawing and Location of the Malfunction Indicator Light for following models
• Calculated load and fuel trim determination