Powertrain figures — Smart Fortwo (451)

220 powertrain illustrations for the Smart Fortwo (451) — schematics, exploded views, and procedure photos drawn from the manuals. Open any figure for its source page, part references, and a copyable link.

Two cutaway diagrams of smart fortwo 451 models displaying internal systems and layout. 451Exploded view Smart fortwo 451 coupe and cabrio cutaway views showing Engine · p9 Labeled engine bay photo showing four numbered maintenance access points in smart fortwo 451 engine compartment. 451Location callout Engine compartment maintenance points for smart fortwo 451 Engine · p17 Cutaway view of M132 three-cylinder gasoline engine showing internal components and layout. 451Exploded view Engine M132 3-cylinder gasoline engine with 999 cm³ Engine · p31 Numbered exploded view diagram of engine valve assembly with 11 labeled parts and descriptive text. 451Exploded view Valve assembly exploded diagram showing timing chain Engine · p34 Exploded view of M132 engine cylinder head showing valve timing components, camshafts, and cup tappets with 12 numbered callouts. 451Exploded view Engine M132 valve timing components with mechanical cup Engine · p35 Engine M132 gasoline injection ignition system schematic showing sensors, actuators, and control modules interconnected. 451Schematic Gasoline injection and ignition system data flow chart for Engine · p37 Engine block front view showing belt drive pulleys and tensioning components with numbered callouts 1-8. 451Exploded view Belt drive system with eight labeled components: alternator Engine · p39 Cooling system schematic with numbered components: radiator, expansion reservoir, coolant pump, thermostat, and heater exchanger. 451Schematic Smart fortwo 451 cooling system circuit diagram showing Engine · p40 Engine bay diagram and close-up photos of cooling system components including reservoir and hose clamp. 451 Cooling system bleeding procedure for smart fortwo 451 Cooling · p41 Exploded view diagram of engine mounting system showing frame support, engine mount, transmission mount, and torque support with magnified detail views. 451Exploded view Engine mount, transmission mount, and torque support Engine · p42 Exploded view of fuel system with seven numbered components and labeled part codes. 451Exploded view Fuel supply system components for 451 chassis, showing Fuel system · p45 Labeled diagram of exhaust system components including manifold, converter, muffler, and sensor locations. 451Exploded view Exhaust system overview for smart fortwo 451 showing Exhaust · p46 Engine diagram showing secondary air injection pump M33, switchover valve Y32, hoses, and cylinder head with numbered callouts. 451Location callout Secondary air injection system components and operation on Engine · p47 Cutaway technical illustration of AMT 2 transmission assembly with gears and control mechanisms visible. 451Exploded view 5-speed automated manual transmission (AMT 2) for smart Transmission · p48 Exploded diagram of shift mechanism showing motors M17/3 and M17/4, selector drums, shift forks, and input shaft. 451Exploded view Shift mechanism design with selector drums, electric Transmission · p50 Technical diagram of transmission shift mechanism with selector drums and sliding block positions for neutral and reverse. 451Schematic Shift mechanism function and selector drum positions for Transmission · p51 Shift mechanism components with selector drums, sliding blocks, and gear engagement diagrams. 451Exploded view Shift mechanism selector drums and sliding blocks for Transmission · p52 Technical diagram of shift mechanism with selector drums, sliding blocks, and shift position grid squares labeled a-d. 451Schematic Shift mechanism for 3rd and 4th gear in smart fortwo 451 Transmission · p53 Technical diagram of transmission shift mechanism showing selector drums and sliding blocks for gear selection. 451Exploded view Shift mechanism for 5th gear with selector drum positions Transmission · p54 Exploded technical diagram of transmission synchronizer components with four numbered callouts. 451Exploded view Borg-Warner synchronization system for forward gears in Transmission · p55 Transmission RPM sensor mounted on transmission housing; oscilloscope waveform showing sensor output signal 451Schematic Transmission RPM sensor (L2) location on transmission Transmission · p56 Labeled diagram of two transmission control motors mounted on transmission selector drums 451Exploded view Transmission motors M17/3 and M17/4 selector drum assembly Transmission · p57 N15/6 control unit shown mounted below driver seat with exploded view diagram and technical specifications. 451 Automated manual transmission control unit N15/6 location Transmission · p58 Diagram of electronic selector lever showing P, R, N, D, M positions with unlock button and shift mechanics. 451Location callout Electronic selector lever module control unit (N15/5) Transmission · p59 Instrument cluster showing gear range display and multifunction display for transmission control modes. 451Location callout Transmission control modes displayed on instrument cluster Transmission · p60 Transmission control system schematic showing N47-5, N3/10, N10/10, N15/5, N15/6 modules and sensors connected via CAN bus. 451Wiring diagram Automated manual transmission control data flow chart for Transmission · p61 Park pawl mechanism photos showing transmission, cable, and control switch installation points. 451Location callout Mechanical park pawl assembly with electronic selector Transmission · p62 Exploded view of clutch pressure plate, clutch plate, and flywheel with numbered callouts. 451Exploded view Single-plate dry clutch assembly for model 451 with Transmission · p63 Exploded view of clutch motor assembly showing electric motor, clutch motor M18, actuating plunger, and electric motor connector. 451Exploded view Smart 451 clutch motor assembly with electric actuator, M18 Transmission · p64 Wiring schematic of Smart 451 SAM unit with ignition wire positions and remote-activated switch relay diagram. 451Wiring diagram Smart 451 SAM unit wiring diagram for remote start Engine · p2 Interior trim parts: aluminum shift paddles, DCT shift lever knob, and carbon-fibre trim set for smart 453. 451 Shift paddles, DCT lever knob, and carbon-fibre interior Transmission · p24 Smart fortwo 451 introduction page with cutaway views of vehicle mechanics and drivetrain 451Exploded view Introduction of the smart fortwo Model series 451 with Engine · p1 Engine compartment photo with four numbered maintenance point callouts labeled 7-10. 451Location callout Engine compartment maintenance points on smart fortwo 451 Engine · p17 SAM control unit fuse box diagram showing numbered fuse slots 1-26 and relay positions R1-R9. 451 Smart Fortwo 451 SAM control unit with fuse locations and Engine · p29 Cutaway view of M132 three-cylinder engine showing internal components and assembly. 451Exploded view Engine M132 3-cylinder gasoline engine with 999 cm³ Engine · p31 Exploded view diagram of valve assembly with 11 numbered parts and descriptive labels. 451Exploded view Valve assembly components for Smart Fortwo 451 M132 engine Engine · p34 Cutaway engine diagram showing valve timing components, camshafts, and cup tappets with 12 numbered callouts. 451Exploded view Engine M132 valve timing components and cup tappet Engine · p35 Schematic diagram of fuel injection system components and their connections to engine control unit 451Schematic Gasoline injection and ignition system data flow chart for Engine · p37 Engine belt drive diagram with eight numbered callouts identifying pulleys and belt components 451Exploded view Belt drive system components for smart fortwo 451, showing Engine · p39 Exploded view diagram of engine cooling system components with ten numbered callouts and technical descriptions. 451Exploded view Cooling system circuit diagram with labeled components Engine · p40 Engine bay photo showing cooling system cap and expansion reservoir with numbered callouts for bleeding procedure. 451 Cooling system bleeding procedure and expansion reservoir Cooling · p41 Exploded view diagram showing engine and transmission mounting points with three magnified detail circles. 451Exploded view Engine mount, transmission mount and torque support Engine · p42 Exploded view of fuel system parts with labeled callouts and component list below. 451Exploded view Fuel supply system components for Smart Fortwo 451 Fuel system · p45 Exploded view of exhaust components including manifold, converter, muffler, and sensor locations. 451Exploded view Exhaust system overview for Smart Fortwo 451 showing Exhaust · p46 Engine diagram showing secondary air injection pump M33, switchover valve Y32, combination valve, air hose, and vacuum hose with callouts 1-4. 451Exploded view Secondary air injection system components on Engine 132 Engine · p47 Cutaway technical illustration of 5-speed automated manual transmission assembly with visible gears and actuators. 451Exploded view 5-speed automated manual transmission (AMT 2) cutaway view Transmission · p48 Exploded diagram of shift mechanism components with eight numbered callouts and two motor labels. 451Exploded view Shift mechanism exploded view showing selector drums Transmission · p50 Technical diagram of transmission shift mechanism with selector drums and neutral/reverse gear positions. 451Schematic Shift mechanism function and selector drum positions for Transmission · p51 Transmission shift mechanism diagram showing selector drums, sliding blocks, and gear position grid patterns. 451Exploded view Automated manual transmission shift mechanism with selector Transmission · p52 Shift mechanism diagram showing selector drums, sliding blocks, and gear position grids for smart fortwo 451. 451Schematic Automated manual transmission shift mechanism selector Transmission · p53 Shift mechanism diagram showing selector drums and sliding block deflection with grid reference guide. 451Exploded view Shift mechanism and 5th gear selector drum positioning with Transmission · p54 Technical diagram of transmission synchronization components with four numbered callouts identifying internal parts. 451Exploded view Borg-Warner synchronization mechanism in automated manual Transmission · p55 Transmission RPM sensor mounted on transmission housing; oscilloscope waveform shows sensor signal pattern. 451Schematic Transmission rpm sensor L2 location on transmission housing Transmission · p56 Exploded view of two transmission motors with selector drums labeled M17/3 and M17/4 on transmission assembly. 451Exploded view Transmission motors M17/3 and M17/4 selector drums on Transmission · p57 Diagram showing transmission control unit location in passenger compartment and component connections. 451Exploded view Automated manual transmission control unit N15/6 location Transmission · p58 Transmission selector lever diagram showing P, R, N, D, M positions with unlock button and shift controls. 451Location callout Electronic selector lever module control unit N15/5 Transmission · p59 Speedometer and multifunction display showing transmission gear selection and recommendations. 451Location callout Instrument cluster showing manual and automatic Transmission · p60 Schematic diagram showing transmission control modules, sensors, and CAN bus connections for fortwo model 451. 451Wiring diagram Transmission control data flow chart for Smart Fortwo 451 Transmission · p61 Park pawl components mounted on transmission with electronic selector module and switch locations labeled. 451Exploded view Mechanical park pawl assembly for 5-speed automated manual Transmission · p62 Three labeled clutch components: pressure plate, green clutch plate, and flywheel assembly. 451Exploded view Single-plate dry clutch components for model 451: pressure Transmission · p63 Cutaway view of clutch motor showing electric motor, actuating plunger, and M18 connector labeled. 451Exploded view Model 451 clutch motor assembly with electric motor Transmission · p64 Lowered rear module of smart fortwo 451 with engine and drivetrain exposed under red body panel. 451 Rear drive module lowered for service access on chassis Engine · p67 Gearshift diagram with P R N D M positions and engine starting instructions with warnings about exhaust fumes and pedal clearance. 451 Transmission gearshift pattern and starting procedure for Transmission · p81 Gear selector lever diagram showing P R N D M + - positions and shifting safety warnings. 451Location callout Transmission gear selector lever positions and shifting Transmission · p85 Steering wheel with three numbered callouts showing manual gearshift paddles and control positions. 451Location callout Transmission upshifting, downshifting, manual gearshifting Transmission · p88 Odometer display showing 18000 miles and 4082, with transmission position indicator legend for P, R, N, D positions. 451 Instrument cluster main odometer display and transmission Transmission · p91 Dashboard instrument cluster showing freeze warning symbol, fuel gauge with eight segments, and steering wheel control buttons. 451 Instrument cluster freeze warning, fuel level display, and Fuel system · p93 Fuel filler cap removal steps and break-in driving instructions with gasoline safety warnings. 451 Fuel filler flap location and refueling procedure with Fuel system · p112 Engine compartment access instructions with five numbered components and warning about high-voltage ignition system. 451Location callout Engine compartment cover opening and closing procedure with Engine · p114 Oil dipstick with minimum and maximum marks, removal and insertion instructions for checking engine oil level. 451 Engine oil dipstick location and checking procedure on Engine · p115 Diagram showing oil filler cap labeled with callout 1 on engine, with step-by-step refill instructions and safety warnings. 451Location callout Engine oil filler cap location and refill procedure for Engine · p116 Diagram showing coolant reservoir with numbered callouts for pressure cap and fill level marks on driver's side. 451Location callout Front compartment coolant reservoir location and checking Cooling · p118 Vehicle specification page showing engine number location, VIN plate example, cargo compartment VIN location, and detailed engine specifications table. 451Torque table Engine specifications and vehicle identification details Engine · p205 Numbered diagram showing fuel door opening, cap insertion, and service flap access points with safety warnings. 451Location callout Fuel filler flap opening procedure and service flap Fuel system · p22 Transmission gearshift diagram showing P, R, N, D, M positions and driving instructions with warnings. 451Location callout Gearshift pattern and driving procedures for Smart Fortwo Transmission · p78 Gear selector lever diagram showing P, R, N, D, M positions with shift pattern and transmission warnings. 451 Transmission controls, gear selector lever positions, and Transmission · p81 Steering wheel with shift paddles labeled, transmission manual gearshift instructions and warnings 451Location callout Manual gearshifting procedures including upshifting Transmission · p84 Instrument cluster page showing odometer display examples and transmission gear position indicator chart. 451 Instrument cluster multifunction display illumination, main Transmission · p87 Instrument cluster showing fuel gauge with eight segments, freeze warning symbol, and two control buttons for display settings. 451 Instrument cluster fuel level display, freeze warning Fuel system · p89 Owner manual page showing first 1000 miles operation guidelines, fuel safety warnings, and numbered fuel filler cap installation steps. 451 Fuel system break-in procedure, safety warnings, and Fuel system · p108 Engine compartment access instructions with five numbered diagram callouts and safety warnings. 451Location callout Engine compartment cover opening and closing procedure with Engine · p110 Oil dipstick with numbered callouts showing minimum and maximum fill marks in engine compartment 451Location callout Engine oil level checking procedure with dipstick location Engine · p111 Photo of unscrewing engine oil filler cap from filler neck; instruction text with three warning callouts. 451 Engine oil filler cap location and filling procedure on Engine · p112 Diagram showing coolant reservoir with numbered callouts for pressure cap and level marking on Smart Fortwo driver's side. 451Location callout Coolant and washer fluid checking and filling procedures Cooling · p114 VIN plate location diagram and engine/electrical specs table for smart fortwo 451Location callout Vehicle identification number location on cargo compartment Engine · p201 Refueling steps showing fuel door, cap insertion, and service panel access with numbered callouts. 451Location callout Fuel filler flap opening procedure and service flap access Fuel system · p18 Transmission section showing gear selector lever positions P, R, N, D, M, +, - and shifting procedures with warnings. 451Location callout Transmission controls and gear selector lever positions for Transmission · p84 Transmission manual gearshift control instructions with steering wheel shift paddle locations marked 1 and 2. 451 Manual transmission gearshifting procedures: upshifting Transmission · p87 Odometer showing 18000 miles, transmission position table with P R N D gears and manual gear display 1-5. 451 Instrument cluster main odometer display and transmission Transmission · p90 Instrument cluster page showing freeze warning display, fuel level gauge, and steering wheel control buttons for status indicator selection. 451Location callout Instrument cluster freeze warning, fuel level display, and Fuel system · p92 Owner manual page showing engine break-in guidelines and fuel filler cap opening procedure with numbered callouts. 451 Fuel system break-in procedures and refueling safety Engine · p120 Engine compartment opening instructions with five numbered callout points on cargo area diagram. 451Location callout Engine compartment access procedure with numbered callouts Engine · p122 Engine oil dipstick location and oil filler cap with numbered callouts for checking and adding oil. 451Location callout Engine oil level checking procedure and adding oil to Engine · p123 Coolant cap with numbered callouts showing pressure cap and fill level marking bar 451Location callout Coolant reservoir location, pressure cap removal procedure Cooling · p126 Steering wheel and gear shifter diagram showing starting steps and transmission positions P, R, N, D, M, +, -. 451Location callout Starting procedure and gearshift pattern for Smart Fortwo Transmission · p16 Numbered diagrams showing fuel filler cap location and service flap removal steps with lever positions. 451Location callout Service flap opening procedure and refueling access points Fuel system · p17 Engine compartment with hoses, tubing, and mechanical components visible 451 Engine bay overview showing coolant hose routing and Engine · p27 Gearshift lever diagram showing gear positions P, R, N, D, M with release button, and transmission operation instructions. 451 Gearshift pattern and transmission operating procedures for Transmission · p81 Gear selector lever diagram showing P, R, N, D, M positions and engine shutdown instructions. 451 Transmission gear selector lever positions and turning off Transmission · p84 Steering wheel with numbered shift paddles and transmission control instructions for manual gearshifting. 451 Manual transmission upshifting, downshifting, kickdown Transmission · p87 Transmission position indicator showing gear positions P, R, N, D and digital clock with time setting instructions. 451Wiring diagram Instrument cluster transmission position indicator and Transmission · p90 Refueling instructions with diagrams showing fuel filler cap removal and safety warnings for gasoline handling. 451Location callout Fuel system break-in procedures, refueling warnings, and Fuel system · p118 Engine compartment opening and closing steps with labeled diagram showing five numbered components and fastening points. 451Location callout Engine compartment access procedure with numbered callouts Engine · p120 Oil dipstick and filler cap locations in engine compartment with numbered callouts. 451Location callout Engine oil dipstick location and checking procedure with Engine · p121 Coolant reservoir with numbered callouts showing pressure cap and level indicator marks on driver's side of front compartment. 451Location callout Front compartment coolant reservoir location and checking Cooling · p124 Two photographs showing coolant reservoir locations and windshield washer reservoir in front compartment with numbered callouts. 451Location callout Front compartment coolant system checking and adding Cooling · p122 Gearshift lever diagram with positions P, R, N, D, M and driving instructions with safety warnings. 451Location callout Transmission gearshift pattern, driving procedures, and Transmission · p80 Gear selector lever diagram showing P, R, N, D, M positions and shift buttons for upshifting and downshifting. 451 Transmission controls and gear selector lever positions for Transmission · p83 Instrument cluster display with odometer reading and transmission position indicator table showing P, R, N, D positions and manual gear selection 1-5. 451 Instrument cluster display functions including odometer Transmission · p89 Instrument cluster page showing freeze warning display, fuel level indicators, and steering wheel control buttons. 451 Instrument cluster freeze warning, fuel level display, and Fuel system · p91 Instrument cluster page showing fuel gauge, tachometer, clock controls, and numbered callout diagrams 451 Instrument cluster controls: reserve fuel indicator Fuel system · p93 Refueling instructions with numbered callouts showing fuel filler flap location and cap insertion on passenger side. 451 Fuel system refueling procedure and break-in operating Fuel system · p118 Engine compartment access instructions with labeled diagram showing cover removal steps and oil level checking guidance. 451Location callout Engine compartment cover opening and closing procedure with Engine · p120 Oil dipstick with numbered callouts and oil filler cap removal instructions in engine compartment. 451Location callout Engine compartment oil dipstick location and oil filler cap Engine · p121 Front compartment diagrams showing service flap operation and coolant reservoir location and level checking. 451Location callout Coolant system service access and reservoir checking Cooling · p124 Pressure cap with numbered callout and coolant level check instructions for Smart car. 451 Coolant filling procedure and windshield washer system Cooling · p125 Practical hints section on replacing vehicle bulbs with numbered callouts and warning text. 451Location callout Headlamp and fog lamp bulb replacement procedure with Engine · p180 Coolant expansion tank access and inspection steps for Smart Fortwo front compartment. 451Location callout Front compartment coolant expansion tank location and Cooling · p124 Technical data page showing ID plate details, label locations on car diagram, and coolant specs 451Location callout Vehicle identification plate, labels locations, VIN Cooling · p186 Gearshift lever positions showing P, R, N, D selections and numbered callout on brake pedal. 451Location callout Transmission shifting procedure, gearshift pattern, and Transmission · p81

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