Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2009650I 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMSELF DIAGNOSIS - THEORY & OPERATION (N62)
2009 BMW 650i 2D Coupe, Automatic
Self Diagnosis - Theory & Operation (N62)
2009 BMW 650i 2D Coupe, AutomaticSECTION Self Diagnosis - Theory & Operation (N62)
- Diagnostic Trouble Code Index
- 1.1 Catalyst monitoring
- 1.2 Heated Catalyst Monitoring
- 1.3 Misfire Detection
- Notes
- 1.3.1 Segment time formation (%DMDTSB)
- 1.3.2 Correction of the Segment Time ts(n) (%DMDFOF)
- 1.3.3 Calculation of the engine roughness values luts, fluts and dluts (%DMDLFB)
- 1.3.4 Determination of the engine roughness correction value (%DMDFON)
- 1.3.5 Fuel-on correction of engine roughness values luts, fluts and dluts (%DMDLFK)
- 1.3.6 Misfire detection by luts-method (%DMDLU)
- 1.3.7 Misfire detection by dluts-method (%DMDDLU)
- 1.3.8 Misfire detection by fluts-method (%DMDLUA)
- 1.3.9 Connection of misfire detection methods (%DMDLAD)
- 1.3.10 Fault handling and misfire statistics (%DMDMIL)
- 1.3.11 Deactivation of the misfire detection (%DMDSTP)
- 1.3.12 Cylinder-bank deactivation because of voltage drop at all ignition coils
- 1.4 Evaporative System Diagnosis
- 1.5 Secondary Air System Monitoring
- 1.6 Diagnosis of fuel system
- 1.7 Oxygen sensor monitoring
- 1.7.1 Monitoring of the front oxygen sensor's heater power stage
- 1.7.2 Front oxygen sensor's heater control diagnosis
- 1.7.3 Rationality check of the front oxygen sensor
- 1.7.4 Response rate monitor of the front oxygen sensor
- 1.7.5 Monitoring of the front oxygen sensor's voltage
- 1.7.6 Detection of exchanged front oxygen sensor connectors
- 1.7.7 Diagnosis of the evaluation IC of the front oxygen sensor
- Notes
- 1.7.7.1 Open circuit - VM line interruption
- 1.7.7.2 Open circuit - UN line interruption
- 1.7.7.3 Open circuit - IA line interruption
- 1.7.7.4 Open circuit - IP line interruption
- 1.7.7.5 Comparison with the set-point A/F ratio of the front oxygen sensor
- 1.7.7.6 Rationality check with the lambda controller factor
- 1.7.7.7 Short circuits to ground or to battery voltage
- 1.7.7.8 Monitoring of the communication between the Evaluation-IC CJ125 and the Microcontroller of the PCM
- 1.7.7.9 Low supply voltage of the CJ125 IC
- 1.7.7.10 Electrical trimming
- 1.7.8 Diagnosis of electrical faults of the front oxygen sensor
- 1.7.9 Operation readiness of the rear HO2S
- 1.7.10 Diagnosis of the heating of the rear oxygen sensor
- 1.7.11 Aging monitor of the rear HO2S
- 1.7.12 Rear oxygen sensor's response rate monitor
- 1.8 Exhaust Gas Recirculation (EGR) System Monitoring
- 1.9 Positive Crankcase Ventilation (PCV) System
- 1.10 Engine Cooling System Monitoring
- 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
- 1.13.2 Variable Valve Lift (VVL) - Electrical Diagnosis
- 1.13.3 Monitoring overview - VVL sensor diagnosis
- 1.13.4 Monitoring function - control position diagnosis
- 1.13.5 Monitoring function - self learning/adaptation diagnosis
- 1.13.6 Monitoring function - CAN communication
- 1.13.7 Monitoring function - VVL control unit faults
- 1.13.8 Monitoring overview - overload protection
- 1.13.9 Monitoring function - valvetronic limp-home
- 1.14 Direct Ozone Reduction
- 1.15 Comprehensive Component Monitoring
- 1.15.1 Fuel level sensor
- 1.15.2 Diagnosis of engine off time
- 1.15.3 Diagnosis of ambient air temperature
- 1.15.4 Diagnosis of atmospheric pressure sensor
- 1.15.5 Diagnosis of differential pressure sensor
- 1.15.6 Diagnosis of mass airflow sensor
- 1.15.7 Diagnosis of vehicle speed
- 1.15.8 Diagnosis of intake air temperature sensor
- 1.15.9 Engine speed sensor and camshaft position (CMP) sensor
- 1.15.10 Diagnosis of throttle position sensors
- 1.15.11 Diagnosis of the throttle valve's control unit
- 1.15.12 Diagnosis of throttle body
- 1.15.13 Diagnosis of Knock Sensor
- 1.15.14 Diagnosis of knock control circuit
- 1.15.15 Diagnosis of knock control serial port interface (SPI) monitoring
- 1.15.16 Diagnosis of idle speed control (ISC)
- 1.15.17 Diagnosis of battery voltage
- 1.15.18 Diagnosis of CAN Data Bus - TCM communication
- 1.15.19 Diagnosis of CAN Data Bus - VVT communication
- 1.15.20 Diagnosis of CAN-Messages
- 1.15.21 Diagnosis of CAN signal timeout
- 1.15.22 Diagnosis of Local CAN B
- 1.15.23 Diagnosis of Powertrain CAN A and CAN C
- 1.16 Listing of DME input and output signals
- 1.17 Diagnosis of output stages
- 1.18 In-use monitor performance ratio - kernel function
- 1.19 Location of data link connector
- 1.20 Drawing and location of the malfunction indicator lamp
- 1.21 Calculated load and fuel trim determination
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.