Functional Descriptions - F25 - Cooling System, Engine Performance

• Cooling System - Functional Description
  • Check urea/water mixture quality
  • Coolant pump, low temperature exhaust-gas recirculation cooler
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • Function check of the component
  • Coolant shutoff valve
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • Coolant temperature sensor (Ver.1)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Coolant temperature sensor (Ver.2)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Coolant temperature sensor before low temperature exhaust-gas recirculation cooler
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Engine cooling
    • Notes
    • Brief component description
    • Electric fan
    • Coolant temperature sensor
    • Characteristic map thermostat
    • Cooling ducts
    • System overview
    • System functions
    • Engine cooling
    • Notes for Service department
      • Guard
  • Engine cooling, diesel engine
    • Notes
    • Brief component description
    • Cooling circuit for 6-cylinder diesel engine N57D30S1
    • Cooling circuit for 6-cylinder diesel engine N57D30T1
    • Cooling circuit for 6-cylinder diesel engine N57D30O1
    • Cooling circuit for 4-cylinder diesel engine N47D20T1
    • Cooling circuit for 4-cylinder diesel engine N47D20
  • Electrical coolant pump
    • Notes
    • Assembly and mounting of the pump
    • Diagnosis instruction
  • Electric fan
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Radiator blind drive
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Switch-on conditions and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
• Engine Performance - Functional Description
  • Accelerator pedal module
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Specifications and characteristic curve
    • Diagnosis instructions
      • Failure of the component
  • Additional exhaust-gas recirculation cooler
    • Notes
    • Function
    • Components
  • Air mass system test for diesel engines
    • Notes
    • Component groups of the air mass system
    • Test sequence
    • Evaluation of the test
    • Evaluated and displayed measured values
    • Influence of the swirl flaps
    • Requirements for the air mass system test
  • Air supply (Ver.1)
    • Notes
    • Brief component description
    • Intake manifold
    • Intake air temperature pressure sensor
    • Electromotive throttle actuator
    • Blow-off valve
    • Exhaust turbocharger with wastegate valve
    • Hot-film air mass meter
    • System overview
    • System functions
    • Calculation of air mass
    • Charging pressure control
    • Idle speed control
  • Air supply (Ver.2)
    • Notes
    • Brief component description
    • Intake manifold
    • Intake air temperature pressure sensor
    • Electromotive throttle actuator
    • Blow-off valve
    • Exhaust turbocharger with wastegate valve
    • Hot-film air mass meter
    • System functions
    • Calculation of air mass
    • Charging pressure control
    • Idle speed control
  • Automatic engine start-stop function
    • 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
      • Power management and battery exchange
      • Diagnosis instructions
  • Camshaft sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Changeover valve, low temperature EGR cooler
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • Characteristic map thermostat
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Temperature profile and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Charging pressure control
    • Notes
    • Component overview
      • Turbochargers with variable turbine geometries and charge-air pressure actuators
      • Function
      • Checking variable turbine geometry
      • Fault handling
      • Charging pressure sensor
      • Charge-air temperature sensor
  • Check diesel particulate sensor
  • Check mixer SCR exhaust emission system
    • Notes
    • F15 overview, N57 exhaust system
    • F10 overview, N57 exhaust system
  • Checking engine internal pressure
    • Notes
    • Connection of measuring equipment
    • Nominal values
    • Causes of excessively high excess pressure
    • Symptoms and consequences of excessively high excess pressure
    • Causes of excessively high vacuum
    • Symptoms and consequences of excessively high vacuum
  • Chafe marks on the engine wiring harness
    • Notes
    • Localization of the chafe marks
  • Control unit DDE7
    • Notes
    • Fault handling
  • Crankshaft sensor (Ver.1)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Crankshaft sensor (Ver.2)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • Detection of air mass deviations
    • Air mass deviations in the event of sooting
    • Air mass deviations
  • Detection of engine speed variations
    • Engine speed variations in the case of sooting
    • Engine speed variations
  • Diesel particle filter service instructions
    • Complaint
    • Cause
    • Measure
    • Regeneration
  • Diesel particulate filter
    • Notes
    • Brief component description
      • Sensor system on the diesel particulate filter
    • System functions
      • Strategy regeneration of diesel particulate filter
      • Operation of the diesel particulate filter
      • Switch-off strategy for regeneration
  • Diesel particulate sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • EGR controller
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Schematic overview and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Electric changeover valve exhaust flap
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Activation and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Electric changeover valve, bypass flap, exhaust-gas recirculation cooler
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Function principle and target values
    • Diagnosis instructions
      • Failure of the component
  • Electric fuel pump nominal values (N52 engine)
  • Electronic control of the fuel pump
    • Fuel system
    • System function
    • Control unit variants
    • Types of control
    • Fuel pump
  • Engine control system interfaces
    • Notes
    • Brief component description
    • Digital engine electronics
    • System overview
    • System functions
    • Electronic immobiliser
    • Notes for Service department
  • Engine mount control
    • Notes
    • Function
    • Troubleshooting
  • Engine speed recording
    • Notes
    • Brief component description
    • Crankshaft sensor
    • System overview
    • System functions
    • Misfire detection
  • Engine ventilation heating
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Switch-on conditions and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Engine ventilation heating (Ver.1)
    • Notes
    • Associated components
    • Function
  • Engine ventilation heating (Ver.2)
    • Notes
    • Associated components
    • Function
  • Ethanol sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • ECO PRO mode
  • EWS interface EWS4
    • Notes
    • Function
      • Data transfer between CAS/FEM/BDC and engine control unit
        • CAS/FEM/BDC interface to the engine control unit
      • Key identification and starting operation
      • Fault recognition in engine control unit
  • Exhaust backpressure sensor before exhaust turbocharger
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Exhaust camshaft sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Exhaust emission system
    • Notes
    • Brief component description
    • Exhaust manifold
    • Twin-scroll turbocharger
    • Blow-off valve
    • Oxygen sensor
    • Catalytic-converter mounted close to the engine
    • Exhaust flap (on specific models)
    • Engine ventilation heating
    • System overview
    • System functions
    • Oxygen sensor emissions control
    • Notes for Service department
    • Diagnosis instructions
    • CO adjustment
    • Oxygen sensor adaptation
    • Catalytic converter diagnosis
  • Foot pedal (Ver.1)
    • Brief component description
      • Brake light/brake light test switch
      • Clutch module (manual gearbox only)
      • Accelerator pedal module
  • Foot pedal (Ver.2)
    • Notes
    • Brief component description
    • Accelerator pedal module
    • Brake light switch
    • Clutch module
    • System overview
    • Notes for Service department
      • Latch mechanism for brake light switch
  • Fuel filter heating
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • Fuel injection
    • Notes
    • Brief component description
    • Injector
    • System overview
    • Notes for Service department
  • Fuel injection rate monitoring
    • Notes
    • Function
    • Fault handling
  • Fuel low-pressure sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Fuel pressure and temperature sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Fuel presupply control
    • Notes
    • Brief component description
    • DDE control unit with fuel presupply pressure control function
    • Fuel pressure and temperature sensor
    • Fuel pump control module
    • Electronic fuel pump
    • Fuel filter heating
    • Notes for Service department
      • Diagnosis instructions
  • Fuel pump control module
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
  • Fuel tank
    • Notes
    • Brief component description
    • Tank vent shutoff valve
    • Tank vent valve
    • Fuel level sensor 1 (left) and fuel level sensor 2 (right)
    • System overview
    • Notes for Service department
      • National-market version for US
  • Fuel tank leakage diagnosis module
    • Notes
    • Functional description
    • Structure and inner circuit
    • Characteristic curves and target values
    • Diagnosis instructions
      • Failure of the component
  • Fuel-quantity control valve and high-pressure pump
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Cutaway view and specifications
    • Diagnosis instructions
      • Failure of the component
  • Functional check on electric EGR valve
  • Fuse measuring points F43
  • High-pressure fuel system
    • Notes
    • Brief component description
      • Notes
      • High-pressure pump with fuel quantity control valve
      • Rail pressure sensor
      • Injector
    • System overview
    • System functions
      • Notes
      • High-pressure control
    • Notes for Service department
      • General notes
  • Hot film air mass meter
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Idle speed
    • Notes
    • Brief component description
      • Notes
      • Crankshaft sensor
      • Electromotive throttle actuator
    • System overview
    • System functions
      • Notes
      • Idle speed control
  • Ignition
    • Notes
    • Brief component description
      • Notes
      • Ignition coils
      • Ignition output stage
      • Spark plugs
    • System overview
    • System functions
      • Notes
      • Multiple spark ignition
      • Ignition circuit monitoring
  • Ignition circuit, safety system (airbag)
    • Notes
    • Checking the ignition circuit
  • Ignition coil
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
    • General notes
  • Injector
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Activation and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Intake camshaft sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Knock control
    • Notes
    • Brief component description
      • Notes
      • Digital Motor Electronics
      • Knock sensor
    • System overview
    • System functions
      • Notes
      • Knock control
      • Super-knocking
  • Knock sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Low pressure fuel system
    • Notes
    • Brief component description
      • Notes
      • Electronic fuel pump
      • Fuel pressure sensor
    • System overview
    • Notes for Service department
      • General notes
  • Mechanical troubleshooting manual for the tank leak diagnosis
    • Notes
    • Check connections at fuel filler pipe for leaks
  • Misfire detection
    • Notes
    • System overview
    • System functions
      • Notes
      • Rough road detection
  • Natural Vacuum Leak Detection (NVLD)
    • Notes
    • Brief component description
      • Notes
      • Fuel evaporation system overview (USA, Korea)
      • Basic version: Natural Vacuum Leak Detection temperature sensor and pressure switch
      • Integrate version: Natural Vacuum Leak Detection temperature sensor and pressure switch
      • Physical principle and pressure pattern
    • System functions
      • Notes
      • Natural Vacuum Leak Detection (NVLD)
      • Tank ventilation
    • Notes for Service department
      • General notes
  • Navigation Professional with Real Time Traffic Information (RTTI)
  • New diagnosis requests for engine control units
    • Notes
    • Overview of available values
  • Nominal values for accelerator pedal module
  • Notice regarding "[!] Current fault patterns"
  • Oxygen sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Oxygen sensor after catalytic converter
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Oxygen sensor before catalytic converter
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Oxygen sensor emissions control EU6 DDE7
  • Oxygen sensors functional check
    • Introduction
    • Preconditions
    • Plausibility criteria
    • Functional check in idle
    • Functional check when pressing on accelerator
  • Rail pressure regulating valve
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Cutaway view and specifications
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Rail pressure sensor
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Characteristic curve and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Selective catalytic reduction (SCR)
    • Notes
    • Brief component description
      • Notes
      • SCR control unit
      • Active tank and SCR delivery module
      • SCR metering module
      • Passive tank with recirculating pump unit
    • System functions
      • Functional networking
      • Networking with the Digital Diesel Electronics (DDE)
    • Notes for Service department
      • Start-up after renewal of parts
      • Start-up after programming
  • Sooting of intake ports of diesel engines
    • Notes
    • Consequences and diagnosis
      • Consequences of sooting
    • Possibilities for diagnosis in case of sooting
    • Cleaning in case of sooting
  • Smooth running control
    • Notes
    • Monitoring
  • Swirl flap actuator
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Schematic overview and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Tank vent shutoff valve
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Nominal values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Tank vent valve
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Activation and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Throttle actuator (Ver.1)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Throttle actuator (Ver.2)
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Signal shape and setpoint values
    • Diagnosis instructions
      • Failure of the component
  • Troubleshooting on the exhaust turbocharger
    • Introduction
    • General notes on troubleshooting
      • Notes
      • Causes
      • Notes on the installation of an exhaust turbocharger
  • VANOS solenoid valve, exhaust
    • Notes
    • Functional description
    • Structure and inner electrical connection
    • Operation times diagram and setpoint values
    • Diagnosis instructions
      • Failure of the component
      • General notes
  • Vacuum supply
    • Notes
    • Brief component description
      • Notes
      • Vacuum pump
    • System overview
    • System functions
      • Notes
      • Build-up of partial vacuum
  • Valve gear (Ver.1)
    • Notes
    • Brief component description
      • Notes
      • 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
      • Notes
      • Variable camshaft timing control, VANOS
      • Valve stroke control, Valvetronic
  • Valve gear (Ver.2)
    • Notes
    • Brief component description
      • Notes
      • Camshafts
      • Intake and exhaust valves
      • Intake camshaft sensor and exhaust camshaft sensor
      • VANOS solenoid actuator, intake and exhaust
      • Valvetronic servomotor
    • System overview
    • System functions
      • Notes
      • Variable camshaft timing control, VANOS
      • Valve stroke control, Valvetronic