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.
2012 BMW 335xi Automatic TransFACTORY OEM SERVICE PROCEDURE
Engine Performance - Functional Description - E92
- Engine Performance - Functional Description
- Accelerator Pedal Module
- Air Flap Control
- Notes
- Brief description of components
- Radiator shutter drive unit
- Electromagnet for radiator shutter
- System functions
- Passive air flap control via electromagnet
- Active air flap control via actuator motor (radiator shutter drive)
- Passive and active air flap control
- Notes for Service department
- Switch-on conditions
- Air Mass System Test For Diesel Engines
- Air Supply (N55)
- Air Supply (ALPINA)
- Ambient Pressure Sensor
- Automatic Engine Start-Stop Function (MSA)
- Notes
- Brief component description
- DC/DC converter
- Automatic engine start-stop function button
- Starter motor
- Alternator
- AGM battery
- Intelligent battery sensor
- Engine compartment lid contact switch
- Seat belt buckle switch
- Brake vacuum sensor, manual transmission
- Zero-gear sensor, manual transmission
- Clutch module, manual transmission
- Hydraulic impulse storage, automatic transmission
- System overview
- System functions
- Displays
- Power management
- Engine shutdown
- Engine start
- Switch-off inhibitors, switch-on requesters and deactivators
- Safety functions
- Notes for Service department
- Camshaft Sensor
- Cap Of Mechanical Movement Range
- Mixer Selective Catalytic Reduction (SCR) Exhaust Emission System
- Urea/Water Mixture Quality
- Combustion Preheating System Digital Diesel Electronics (DDE7.3)
- Controllable Engine Mounts
- Corrosion On The Intake Temperature Sensor
- Crankcase Ventilation
- Digital Diesel Electronics (DDE) Hot Film Air Mass Meter (HFM) Signal
- Digital Diesel Electronics (DDE)
- Digital Diesel Electronics (DDE) Fault Symptoms
- Digital Diesel Electronics (DDE7.3) Control Unit
- Diagnostic Module For Tank Leaks (DMTL)
- Electronic Control Of Fuel Pump
- Engine Control System Interfaces
- Engine Management
- Engine Speed Detection Digital Diesel Electronics (DDE7)
- Engine Speed Recording
- Engine Ventilation Heating
- Engine N54 And Engine N43
- Notes
- Brief component description
- DME: Digital Motor Electronics
- EKPS control unit and electric fuel pump
- High-pressure fuel pump
- Rail with rail-pressure sensor
- Injectors (high-pressure fuel valves)
- Intake-manifold pressure sensor
- Exhaust turbocharger
- Volume-flow-controlled oil pump
- Electric coolant pump
- Oil condition sensor
- Variable camshaft control for the inlet camshaft and for the exhaust camshaft "double VANOS"
- Crankcase made of aluminum
- System functions
- Charging pressure control
- Engine ventilation
- Engine cooling
- Volumetric flow-controlled oil supply
- Supply of fuel in line with requirements
- Discontinuation of the fuel low-pressure sensor
- System protection
- Notes for Service department
- Exhaust Emission System
- Actuator
- Fault In Vacuum System
- Foot Pedal
- Fuel Filter Heating
- Fuel Heating
- Fuel Injection
- Fuel Injection Rate Monitoring
- Fuel Injector Return Volume Measurement
- Fuel Supply (MSS60)
- Fuel Tank
- Fuel Temperature Sensor
- Secondary Air System Pressure Hose
- High-Pressure Exhaust Gas Recirculation Digital Diesel Electronics (DDE 7.3)
- High-Pressure Fuel System (N55)
- High-Pressure Fuel System
- Idle Speed
- Ignition
- Intake Air Temperature Sensor
- Ionic Current Measurement S65/S85
- Knock Control
- Loose Screw Connection On Operating Lever Of Turbine Control Flap
- Low Pressure Fuel System
- Environmental Air Catalyst (EAC) Sensor
- Auto Start/Stop (MSA) And Power Management
- Auto Start/Stop (MSA) Test Module Zero Gear Sensor
- Auto Start/Stop (MSA) Test Module For Brake Partial Vacuum Sensor (BUS)
- MSV70 Simultaneous Operation Of Accelerator/Brake Pedals
- Troubleshooting Tank Leak
- Notes
- Check connections on the fuel tank and lever sensor for leaks
- Check the connections on the carbon canister and check the carbon canister for leaks, if applicable
- Check connections at fuel filler pipe for leaks
- Check the connections for scavenging air and, if applicable, the tank vent valve for leaks
- Check the corrugated tubing for leaks
- Check the lines for leaks
- Check the connector at the DMTL for leaks
- Misfire Detection
- N52K Engine Primary Catalytic Converters
- Dig In Bearing Bank (NG6)
- Nominal Values For Accelerator Pedal Module
- Non-Return Valve
- Oxygen Sensor Emissions Control (S65)
- Rail Pressure Control Digital Diesel Electronics (DDE 7.3)
- SCR Catalytic Converter System Test (Generation 1: M57/N57 Engine In E7X, E90)
- Selective Catalytic Reduction (SCR) System (DIESEL) (ACTIVE TANK)
- Notes
- SCR system overview (without passive tank)
- Components of the SCR system (without passive tank)
- Chemical reaction of the selective catalytic reduction
- Operating strategy and display concept for US diesel
- Temperature resistance and ageing stability of the mixture
- Integration of the SCR system in the particle filter composite system
- Interaction with MSA system (Automatic Start/Stop function)
- Diagnosis instructions
- Signal names and interface description
- Selective Catalytic Reduction (SCR) System (DIESEL) (PASSIVE TANK)
- Selective Catalytic Reduction (SCR) System (DIESEL) Particle Filter System
- Selective Catalytic Reduction (SCR) Warning And Shutdown Scenario
- Smooth Running Control
- System Test For Electrical Vacuum Pump MSS65
- Tank-Ventilation Valve (S65)
- Test Of High-Pressure Pump
- Interface Faults - Troubleshooting
- Exhaust Turbocharger - Troubleshooting
- Turbocharger Check On N54 Engine
- 1) Visual inspections
- 2) Active diagnosis of the turbochargers
- 3) Check the exhaust flap
- 4) Check the electropneumatic pressure converters (= EPDW)
- 5) Check the intake system for leak-tightness with the diagnosis device
- 6) Check the wastegate and blow off valve
- 7) Check the catalytic converter and turbo module
- VANOS System Test (MSS60)
- Vacuum Supply
- Valve Gear
- Notes
- Brief component description
- Camshafts
- Intake and exhaust valves
- Intake camshaft sensor and exhaust camshaft sensor
- VANOS solenoid valve intake and VANOS solenoid valve exhaust
- Valvetronic servomotor
- System overview
- System functions
- Variable camshaft timing control, VANOS
- Valve stroke control, Valvetronic
- Voltage Supply And DDE Main Relay
- Voltage Supply And Digital Diesel Electronics (DDE) Main Relay
Factory Service Tools
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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.
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