Section 894 (Self Diagnosis - Theory & Operation (N52))
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 BMW Z4, 2008 BMW X5, 2008 BMW X3, 2008 BMW 528xi, and 2008 BMW 528i. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnostic Trouble Code Index
- Catalyst Monitoring
- Heated Catalyst Monitoring
- Misfire Monitoring
- EVAP: Evaporative System
- Secondary Air System Monitoring
- Fuel System Monitoring
- Oxygen Sensor Monitoring linear upstream / binary downstream
- Upstream Oxygen Sensor Monitoring (linear)
- Upstream Oxygen Sensor - Short Circuit Monitoring
- Upstream Oxygen Sensor - Open Circuit Monitoring
- Upstream Oxygen Sensor - Signal Controller Monitoring
- Upstream Oxygen Sensor - Signal Activity Check
- Upstream Oxygen Sensor - Swapped Sensors Check
- Upstream Oxygen Sensor - Active Signal Check (Shift to lean / rich)
- Upstream Oxygen Sensor - Signal Dynamic Monitoring (Slow Response)
- Upstream Oxygen Sensor - Signal Monitoring During Fuel Cut-off
- Upstream Oxygen Sensor - Heater Monitoring
- Upstream Oxygen Sensor - Heater Circuit Monitoring
- Downstream Oxygen Sensor Monitoring (binary)
- Downstream Oxygen Sensor - Circuit Monitoring
- Downstream Oxygen Sensor - Signal Dynamic Check During Fuel Cut-off (DFCO)
- Downstream Oxygen Sensor - Dynamic / Transition Time in Sensor Midpoint Range Monitoring
- Downstream Oxygen Sensor - Signal activity check
- Downstream Oxygen Sensor - Signal Check (Stuck lean/rich, Swap)
- Downstream Oxygen Sensor - Heater Plausibility Monitoring
- Downstream Oxygen Sensor - Heater Circuit Monitoring
- Closed Loop Lambda Control - enable conditions
- Upstream Oxygen Sensor Monitoring (linear)
- Exhaust Gas Recirculation (EGR) System Monitoring
- Positive Crankcase Ventilation (PCV) System
- Engine Cooling System Monitoring
- Thermostat
- Engine Coolant Temperature (ECT) Monitoring
- Only for Z4 models with Siemens ECU MSV70: Engine Coolant Temperature 2 (ECT_2) Plausibility Check
- Engine off timer monitoring
- Cold Start
- Air Conditioning (A/C) System Component Monitoring
- Camshaft and Crankshaft Sensor including Valve Timing
- Comprehensive Component Monitoring OBDII Siemens VDO function definition
- Manifold Pressure
- Manifold Differential Pressure Sensor - Rationality check
- Air Mass Flow
- Knock
- Variable Valve Lift (VVL) - Electrical Diagnosis
- Notes
- Monitoring overview
- Monitoring function - electrical diagnosis of the DC motor lines
- Monitoring overview - DC Motor current, power stage temperature and DC Motor overload
- Monitoring function - power stage temperature diagnosis
- Monitoring function - power stage current diagnosis (long term current)
- Monitoring function - power stage current diagnosis (short term current)
- Monitoring function - DC motor overload temperature
- Monitoring function - power stage self diagnosis
- Monitoring function - power supply control motor
- Monitoring function - VVL relay diagnosis
- Monitoring overview - sensor diagnosis
- Monitoring function - sensor short circuit diagnosis
- Monitoring function - global sensor fault diagnosis
- Monitoring function - control position diagnosis
- Monitoring function - self learning / adaptation diagnosis
- Vehicle Speed Signal
- Flow Charts Comprehensive Monitoring
- Listing of all ECM Input and Output Signals
- Location of the Data Link Connector
- Drawing and Location of the Malfunction Indicator Light
- Calculated load and fuel trim determination