🏷️ Basic Information Identification Make: Mazda Model: 121 Generation: DA Series (First Generation) Model Code: WM Model Variant: Left-Hand Drive (LHD) Year: 1990 👋 Introduction Market Position Segment: Subcompact hatchback/sedan Target Audience: Economical urban transportation Competitive Analysis Key Competitors: Ford Fiesta, Volkswagen Polo, Fiat Uno, Toyota Starlet, Opel Corsa Key Features Design Philosophy: Compact, fuel-efficient, practical, affordable Powertrain Availability: Known for reliable, smaller displacement engines Manual Value Utility: Essential for maintaining the longevity and performance of the 1990 Mazda 121 📋 Manual Details Coverage Areas Main Coverage: Comprehensive factory workshop service and repair Page Count Estimated Pages: Over 800 pages (typical for this era's factory manuals) Manual Type Type: Factory Workshop Service Repair Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel system, ignition system, exhaust system, cooling system, lubrication system Drivetrain: Transmission (manual & automatic), clutch, drive axles, differentials Chassis: Suspension (front & rear), steering system, braking system Electrical: Wiring diagrams, lighting, instruments, power distribution, starter, alternator, battery, infotainment system basics Body And Interior: Body construction, doors, windows, seats, trim, HVAC system Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, lubrication Diagnostics: Troubleshooting charts, symptom-based diagnostics, fault code interpretation (if applicable) Repair: Component removal, installation, disassembly, reassembly, adjustments Overhaul: Engine rebuild, transmission overhaul, suspension component rebuilding Specifications: Torque specifications, clearances, tolerances, diagnostic values Technical Depth Depth: In-depth, suitable for professional technicians and advanced DIY enthusiasts 📊 Manual Specifications File Format Digital Format: PDF Print Quality Scan Quality: High-resolution scans, clear text and diagrams Binding Type Binding: N/A (Digital Format) Paper Type Paper Quality: N/A (Digital Format) Searchability Text Search: Searchable text within PDF for quick information retrieval Navigation Bookmarks: Likely includes bookmarks for easy navigation between sections ⚙️ Engine Specifications Primary Engine Engine Code: B3 (commonly found in this model/year) Configuration: Inline-4 cylinder Displacement Cc: 1341 cc Displacement Liters: 1.3 L Bore X Stroke: 71.0 mm x 83.6 mm Compression Ratio: 9.5:1 (typical) Valve Train: SOHC (Single Overhead Camshaft), 16 valves (4 valves per cylinder) Performance Horsepower Ps: Approx. 73 PS (at 5500 rpm, typical for B3 engine) Horsepower Hp: Approx. 72 hp (at 5500 rpm, typical for B3 engine) Torque Nm: Approx. 103 Nm (at 3500 rpm, typical for B3 engine) Torque Lb-Ft: Approx. 76 lb-ft (at 3500 rpm, typical for B3 engine) Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) or Carbureted (depending on market/variant) Fuel Type: Unleaded Gasoline Engine Management Ignition Type: Distributorless Ignition System (DIS) or traditional distributor Cooling System Cooling Method: Liquid-cooled Lubrication System Oil Capacity Liters: Approx. 3.0 - 3.5 Liters (with filter) Engine Mounts Type: Hydraulic or rubber engine mounts for vibration isolation 🔧 Transmission Standard Type: 5-speed Manual Transaxle Optional Type: 3-speed Automatic Transaxle (often with lock-up converter) Features Clutch Type: Hydraulically operated diaphragm spring clutch Fluid Specifications Manual Gearbox Oil: API GL-4, SAE 75W-90 or 80W-90 Automatic Transmission Fluid: Mazda ATF D-III or equivalent Dexron II/III 📐 Dimensions Exterior Body Styles: 3-door hatchback, 5-door hatchback, 4-door sedan (depending on market) Length Mm: Approx. 3960 mm (hatchback) Width Mm: Approx. 1645 mm Height Mm: Approx. 1405 mm (hatchback) Wheelbase Mm: Approx. 2345 mm Track Width Front Mm: Approx. 1420 mm Track Width Rear Mm: Approx. 1415 mm Weights Curb Weight Kg: Approx. 850-950 kg (depending on body style and equipment) Gross Vehicle Weight Rating Kg: Approx. 1300-1400 kg Wheels Tires Wheel Bolt Pattern: 4 x 100 mm Standard Tire Size: 165/70 R13 (typical) Optional Tire Size: 175/65 R14 (possible on higher trims) 🛡️ Safety Features Ratings Crash Test Data: Limited official crash test data readily available for this specific model year and region; rely on structural integrity and passive safety features of the era. Active Features Braking System: Front disc brakes, Rear drum brakes ABS: Anti-lock Braking System (ABS) was an optional feature on some higher trims or later production models, not standard. Passive Features Seatbelts: Front and rear seatbelts Head Restraints: Front and rear head restraints (standard) Body Structure: Reinforced safety cage, crumple zones (design of the era) 💡 Technology Features Infotainment Audio System: Basic AM/FM radio with cassette player, optional CD player on higher trims. Speakers: 2-4 speakers typically Driver Assistance Cruise Control: Rarely equipped, typically an aftermarket addition if present. Connectivity Bluetooth Usb: Not applicable for this era. 🔧 Maintenance Service Intervals Oil Change Interval Km: Every 5,000 - 7,500 km or 6 months Air Filter Replacement Km: Every 15,000 - 20,000 km Spark Plug Replacement Km: Every 30,000 - 40,000 km (depending on type) Timing Belt Replacement Km: Every 80,000 - 100,000 km (critical item) Fluid Specifications Engine Oil Grade: API SG/SH, SAE 10W-30 or 10W-40 (preferred); SAE 5W-30 in very cold climates. Coolant Type: Ethylene glycol-based coolant, 50/50 mix with distilled water. Brake Fluid Type: DOT 3 or DOT 4 Power Steering Fluid: ATF (if equipped...