🏷️ Basic Information Identification Make: Citroën Model: C4 Year: 2004 Engine Variant: 1.6i 16V Codes Engine Code Identifier: TU5JP4 (likely, common for this engine) 👋 Introduction Market Position Vehicle Segment: Compact family car (C-segment). Target Audience: Individuals and families seeking a stylish, comfortable, and practical European hatchback. Competitive Analysis Key Competitors: Volkswagen Golf, Ford Focus, Opel/Vauxhall Astra, Renault Mégane. Key Features Design Philosophy: Emphasized aerodynamic styling, innovative interior design, and driver comfort. Manual Utility: Empowers owners and technicians with factory-level knowledge for efficient and accurate repairs and maintenance. 📋 Manual Details Coverage Areas Model Years Covered: 2004 (primarily, with potential relevance to early C4 models) Engine Variants Covered: 1.6i 16V (TU5JP4/EP6 - clarification needed on specific engine code if provided by manufacturer, but 1.6i 16V points to a specific family) Trim Levels Covered: All applicable trim levels for the 1.6i 16V engine variant Page Count Estimated Page Count: Hundreds (as stated, typical for a complete factory manual) Manual Type Manual Type: Workshop Service Repair Manual Language Language: English Format Delivery Format: Instant Download (Digital PDF) 📖 Manual Coverage Systems Covered Engine: Complete overhaul, diagnostics, timing belt, cooling system, lubrication, fuel injection, ignition system, exhaust system, engine management system (ECU). Transmission: Manual transmission (likely, given engine) - removal, installation, internal components, fluid specifications, clutch operation and replacement. Brakes: Hydraulic system, ABS, brake pad and disc replacement, caliper overhaul, bleeding procedures, parking brake. Electrical: Wiring diagrams, battery, charging system (alternator, starter), lighting, fuses and relays, power windows, central locking, dashboard instruments, diagnostic connector (OBD-II). Suspension: Front and rear suspension components, shock absorbers, springs, ball joints, bushings, wheel alignment specifications. Steering: Power steering system (hydraulic), steering rack, tie rod ends, steering column. Bodywork: Exterior panel removal and installation, interior trim, door mechanisms, hood and trunk operation, glass replacement. HVAC: Air conditioning system, heater core, ventilation system, refrigerant handling (with safety precautions). Procedures Included Maintenance: Routine maintenance, oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, brake fluid flush, coolant replacement. Troubleshooting: Diagnostic procedures for common faults, symptom-based troubleshooting guides, error code interpretation. Repair: Step-by-step repair instructions for all major components and systems, including detailed disassembly and reassembly processes. Installation: Installation procedures for replacement parts and accessories. Diagnostics: On-board diagnostics (OBD-II), sensor testing, actuator testing, fault finding. Technical Depth Depth Of Coverage: Comprehensive (Factory-level detail for professional technicians and advanced DIYers). Diagrams Illustrations: High-quality diagrams, exploded views, and detailed illustrations for clarity of procedures. Specifications: Critical torque specifications, clearances, fluid capacities, and other vital data. 📊 Manual Specifications File Format File Format: PDF Compatibility: All versions of Windows & Mac Requirements: Adobe PDF Reader & WinZip (for potential archive extraction if zipped) Print Quality Printability: Full Printable Zoom Functionality: YES (Zoom IN/OUT functionality Binding Type Binding Type: Digital Download (No physical binding) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated Inline-4 Displacement: 1587 cc (1.6 Liters) Bore X Stroke: 78.5 mm x 82.0 mm (typical for TU5JP4) Compression Ratio: 10.2:1 (typical for TU5JP4) Valve Train: DOHC, 4 valves per cylinder Performance Horsepower: Approximately 109 PS (107 bhp; 80 kW) at 6000 rpm (typical for TU5JP4 in this application) Torque: Approximately 147 Nm (108 lb-ft) at 4000 rpm (typical for TU5JP4 in this application) Fuel System Fuel Delivery: Multi-point fuel injection (MPFI) Fuel Type: Unleaded gasoline (RON 95 recommended) Emission Control: Catalytic converter, Euro 3/4 compliant (depending on market) 🔧 Transmission Standard Type: 5-speed Manual Transmission Optional Type: Likely a 4-speed Automatic Transmission (AL4) available on some models, but the manual is specified. Features Clutch Type: Hydraulically operated diaphragm spring clutch 📐 Dimensions Exterior Body Styles: Hatchback (3-door and 5-door) Length: Approx. 4,260 mm (for 5-door hatchback) Width: Approx. 1,773 mm Height: Approx. 1,460 mm Weights Curb Weight: Approx. 1200 - 1300 kg (depending on equipment) 🛡️ Safety Features Ratings Euroncap Rating: 5 Stars (for the C4 model generally, verified for Euro NCAP crash tests of the era) Active Features ABS: Standard (Anti-lock Braking System) Esp: Optional (Electronic Stability Program), potentially available on higher trims. Passive Features Airbags: Multiple airbags (front, side, curtain) depending on trim level. Seatbelts: Pre-tensioned seatbelts with force limiters, ISOFIX child seat anchors. 💡 Technology Features Infotainment Audio System: Factory fitted radio/CD player with steering wheel controls. Navigation: Optional factory navigation system. Driver Assistance Cruise Control: Optional cruise control and speed limiter. Parking Sensors: Optional rear parking sensors. Connectivity Bluetooth: Rare for 2004 models as standard, likely an aftermarket addition or available on later revisions/higher trims. 🔧 Maintenance Service Intervals Oil Change Interval: Typically every 20,000 km or 1 year, whichever comes first (check manual for specific oil type). Timing Belt Replacement: Typically 120,000 km or 5 years (critical item for this engine family; consult manual for exact interval). Fluid Specifications Engine Oil Type: Refer to manual; likely Total Quartz INEO...