🏷️ Basic Information Identification Make: BMW Model: 3 Series Sub Model: M3, 323i, 325i, 328i, 330i Generation Code: E46 Years: 1999-2006 (with specific focus on 2003 models) 👋 Introduction Market Position Segment: Compact Executive Sports Sedan/Coupe Competitive Analysis Key Competitors: Mercedes-Benz C-Class (W203), Audi A4 (B6), Lexus IS300, Infiniti G35 Key Features Platform Emphasis: Rear-wheel drive bias, balanced chassis, driver-focused ergonomics, premium interior materials, sporty performance. Value Proposition Manual Utility: Empowers owners and independent repair shops with the detailed knowledge to maintain and repair their BMW 3 Series, saving significant costs compared to dealership service. 📋 Manual Details Coverage Areas Systems Covered: Engine Management, Lubrication, Cooling, Fuel System, Ignition, Exhaust, Emissions, Manual Transmission, Automatic Transmission, Driveshaft, Final Drive, Brakes, Suspension, Steering, Body, Interior, Electrical System Page Count Estimated Pages: 1500+ Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Detailed disassembly, inspection, assembly, and troubleshooting for all major engine components including cylinder head, block, pistons, connecting rods, crankshaft, camshafts, valve train. Engine Management: Coverage of DME (Digital Motor Electronics), fuel injection, ignition timing, sensors (MAF, O2, Crank, Cam, Knock), actuators (injectors, ignition coils), idle control, VANOS system. Lubrication Maintenance: Engine oil specifications, oil change procedures, filter types, oil pressure testing, lubrication schedules. Cooling System: Radiator, coolant types, water pump, thermostat, fan clutch/electric fan, hoses, expansion tank, bleeding procedures, troubleshooting overheating. Fuel System: Fuel pump, fuel filter, fuel injectors, fuel pressure regulator, fuel lines, EVAP system, troubleshooting fuel delivery issues. Ignition System: Spark plugs, ignition coils, wiring, ignition timing, troubleshooting misfires, coil-on-plug system details. Exhaust Emission Controls: Exhaust manifold, catalytic converter, oxygen sensors, secondary air injection (SAI), PCV system, troubleshooting emission control faults. Manual Transmission: Clutch assembly, gearbox disassembly and assembly, shift linkage, transmission fluid specifications, troubleshooting clutch and transmission issues. Automatic Transmission: GM 5L40-E (RWD) / ZF 5HP19 (AWD/330xi) coverage, transmission fluid type and capacity, valve body diagnosis, torque converter, electronic control unit (TCU), troubleshooting. Driveshaft Final Drive: Driveshaft U-joints, CV joints, differential assembly, axle shafts, fluid types, lubrication, troubleshooting drivetrain noise. Brakes: Brake fluid specifications, master cylinder, brake booster, ABS system, DSC (Dynamic Stability Control), brake caliper, rotor, pad replacement, bleeding procedures, parking brake. Suspension Steering: Front/rear suspension components (struts, shocks, control arms, bushings, sway bars), power steering system, steering rack, tie rods, wheel alignment specifications. Body Interior: Body panel removal/installation, door mechanisms, interior trim, seating, HVAC system (blower motor, evaporator, heater core), convertible top operation (if applicable). Electrical System: Battery, alternator, starter, wiring diagrams, fuses, relays, lighting system, instrument cluster, comfort electronics, diagnostic trouble codes (DTCs), EWS (Immobilizer) system. Procedures Included Maintenance Procedures: Scheduled maintenance checks, fluid changes, filter replacements, belt inspections/replacement, spark plug replacement, brake pad/rotor replacement. Repair Procedures: Step-by-step instructions for component removal, repair, and reinstallation for all major vehicle systems. Includes torque specifications and special tool requirements. Troubleshooting Diagnostics: Systematic diagnostic flowcharts, common fault identification, symptom-based troubleshooting guides, diagnostic trouble code (DTC) interpretation and resolution. Technical Depth Depth: Comprehensive, from basic preventative maintenance to advanced component-level diagnostics and repair. Covers full engine and transmission overhauls. 📊 Manual Specifications File Format Format: PDF Searchable: Yes (typically) Print Quality Printable: Yes Compatibility Operating Systems: WINDOWS and MAC Requirements Software: Adobe PDF Reader Binding Type Type: Digital Download (PDF) Paper Type Type: N/A (Digital) ⚙️ Engine Specifications Primary Engine 323I Engine Code: M52TU B25 Displacement: 2.5 Liters (2494 cc) Cylinders: Inline 6 Horsepower: 184 hp @ 5500 rpm (approx.) Torque: 235 Nm (173 lb-ft) @ 3500 rpm (approx.) Primary Engine 325I Engine Code: M54 B25 Displacement: 2.5 Liters (2494 cc) Horsepower: 189 hp @ 6000 rpm (approx.) Torque: 245 Nm (181 lb-ft) @ 3500 rpm (approx.) Primary Engine 328I Engine Code: M52TU B28 Displacement: 2.8 Liters (2793 cc) Horsepower: 193 hp @ 5300 rpm (approx.) Torque: 280 Nm (206 lb-ft) @ 3200 rpm (approx.) Primary Engine 330I Engine Code: M54 B30 Displacement: 3.0 Liters (2979 cc) Horsepower: 225 hp @ 5900 rpm (approx.) Torque: 289 Nm (214 lb-ft) @ 3500 rpm (approx.) Primary Engine M3 Engine Code: S54 B32 Displacement: 3.2 Liters (3246 cc) Cylinders: Inline 6 (High-Revving, Naturally Aspirated) Horsepower: 333 hp @ 7900 rpm (approx.) Torque: 350 Nm (258 lb-ft) @ 4900 rpm (approx.) Fuel System Type: Sequential Multi-Port Fuel Injection (MS43, MS45.1, MS45 DME) Fuel Type: Premium Unleaded Gasoline (91+ Octane) 🔧 Transmission Standard Type: 5-speed Manual (Getrag 420G for M3, ZF S5D 310Z for others) Optional Type: 5-speed Automatic (GM 5L40-E RWD, ZF 5HP19 AWD/330xi) Features M Drivelogic: Not applicable to 2003 standard 3 Series, but M3 had M Power button for throttle response adjustment. 📐 Dimensions Exterior Sedan Length: 4471 mm (176.0 in) Width: 1739 mm (68.5 in) Height: 1415 mm (55.7 in) Exterior Coupe Length: 4481 mm (176.4 in) Width: 1739 mm (68.5 in) Height: 1372 mm (54.0 in)...