The 2006 Highlander represents the second generation of its popular mid-size crossover SUV, known for its renowned reliability, spacious interior, and comfortable ride. Designed with families in mind, it offers versatile cargo space, available third-row seating, and optional All-Wheel Drive (AWD) capability, making it a well-rounded choice for various needs. This model year brought significant updates including revised styling, enhanced interior features, and powertrain improvements, reinforcing its reputation for quality and value in a competitive segment. Its engineering emphasizes durability and a smooth driving experience, further solidifying its appeal as a practical and dependable family vehicle. This comprehensive service manual provides detailed information for the maintenance, repair, and diagnostics of the 2006 Highlander (XU20 generation). It covers all major systems, including the 3.3L V6 (3MZ-FE) engine, 5-speed automatic transmission, drivetrain, brakes, suspension, steering, and electrical systems. Within its extensive pages, you will find step-by-step procedures for routine maintenance, component replacement, and in-depth troubleshooting guidance. Technical specifications, diagnostic trouble code interpretations, and essential safety guidelines are also included, offering valuable resources for owners, mechanics, and technicians to ensure the optimal performance and longevity of the vehicle. 🏷️ Basic Information Identification Make: Toyota Model: Highlander Year: 2006 Generation Generation Code: XU20 (Second Generation) Codes Chassis Code: ACU20/25 👋 Introduction Market Position Segment: Mid-size Crossover SUV Target Audience: Families seeking a versatile, reliable, and comfortable vehicle with available AWD capability. Competitive Analysis Key Competitors: Honda CR-V, Ford Edge, Chevrolet Equinox, Nissan Murano Key Features Vehicle Strengths: Renowned Toyota reliability, comfortable ride, spacious interior, optional third-row seating, available AWD, good fuel economy for its class. Manual Value Proposition: Provides comprehensive, factory-accurate repair data to maintain and repair the 2006 Highlander effectively, saving time and money compared to dealership service. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive vehicle service, repair, and diagnostics Page Count Estimated Page Count: 1500+ Manual Type Type: Official Factory Service Manual / Repair Manual Software Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: 3.3L V6 (3MZ-FE), 2.4L 4-Cyl (2AZ-FE) - Note: 2006 predominantly features the V6. Transmission: 5-Speed Automatic (U151E) Drivetrain: Front-Wheel Drive (FWD), All-Wheel Drive (AWD) Brakes: Front Ventilated Discs, Rear Solid Discs, ABS, EBD, Brake Assist Suspension: Front MacPherson Struts, Rear Independent Multi-link Steering: Power-assisted Rack and Pinion Electrical: ECU, sensors, actuators, lighting, body control modules, charging system, starting system HVAC: Air conditioning, heating, ventilation systems Body: Exterior panels, doors, interior trim, glass, chassis Diagnostics: OBD-II diagnostics, DTC (Diagnostic Trouble Code) interpretation, system troubleshooting flowcharts Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection/replacement Repair: Engine mechanical repair, transmission overhaul, brake system repair, suspension component replacement, electrical component diagnosis and replacement Troubleshooting: Step-by-step diagnostic procedures for common and uncommon issues Component Replacement: Detailed instructions for removing and installing all major components Specifications: Torque specifications, clearances, fluid capacities, electrical schematics Technical Depth Depth: Full factory-level repair and diagnostic information, suitable for professional technicians and advanced DIYers 📊 Manual Specifications File Format File Quality: High-resolution, searchable PDF, printable pages Print Quality Print Capability: Printable, allowing for easy reference in a workshop environment Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: 3MZ-FE Configuration: 3.3L V6, 24-valve, DOHC, VVT-i Performance Horsepower: 215 hp @ 5600 rpm Torque: 222 lb-ft @ 3600 rpm Fuel System Induction: Electronic Fuel Injection (EFI) Fuel Type: Unleaded Regular (87 Octane recommended) Cooling System Coolant Type: Toyota Super Long Life Coolant (SLLC) - Pink Lubrication Oil Type: API Certified SAE 5W-30 Synthetic Blend or Full Synthetic Oil Capacity: 4.5 US quarts (4.3 liters) with filter change 🔧 Transmission Standard Type: 5-Speed Automatic Transmission Transmission Code: U151E Optional Drive Type: All-Wheel Drive (AWD) optional on most trims Features Transmission Fluid Type: Toyota Genuine ATF WS (World Standard) Transmission Fluid Capacity: Approximately 4.0 US quarts (3.8 liters) for a drain and fill 📐 Dimensions Exterior Length: 188.4 inches (4785 mm) Width: 72.2 inches (1835 mm) Height: 67.9 inches (1725 mm) Wheelbase: 106.7 inches (2710 mm) Weights Curb Weight: 3,930 - 4,180 lbs (1782 - 1896 kg) depending on configuration Cargo Cargo Volume Behind 3Rd Row: 10.5 cu ft (297 liters) Cargo Volume Behind 2Nd Row: 39.7 cu ft (1124 liters) Cargo Volume With All Seats Folded: 78.9 cu ft (2234 liters) 🛡️ Safety Features Ratings NHTSA Front Crash Test: 5 Stars (Driver and Passenger) NHTSA Side Impact Crash Test: 5 Stars (Front and Rear Passengers) IIHS Front Offset Crash Test: Good IIHS Side Impact Crash Test: Good Active Features ABS: Standard Anti-lock Braking System Ebd: Standard Electronic Brake-force Distribution Brake Assist: Standard Brake Assist (BA) Traction Control: Standard Traction Control (TRAC) Stability Control: Standard Vehicle Stability Control (VSC) Passive Features Airbags: Front dual-stage airbags, front side-impact airbags, available side-curtain airbags (3-row models) Seatbelts: 3-point front...