The 1990 Mazda 323 Protege, specifically the Protege 4-Wheel Drive variant with chassis code BG, represented a practical and engaging option in the compact car segment. This model was recognized for its reliable mechanicals, sporty handling characteristics, and the added benefit of all-wheel-drive capability, enhancing its versatility in various driving conditions. Competing against established models like the Honda Civic and Toyota Corolla, the Mazda 323 Protege distinguished itself with a blend of affordability, efficient engineering, and an enjoyable driving experience, making it a solid choice for everyday use and light adventuring. This workshop service repair manual provides comprehensive guidance for the maintenance and repair of the 1990 Mazda 323 Protege. It covers all essential vehicle systems, including detailed procedures for engine mechanicals, fuel and ignition systems, transmission (both manual and automatic), drivetrain, brakes, suspension, steering, and the electrical system. Additionally, the manual offers extensive information on body and chassis work, climate control, and diagnostics, complete with wiring diagrams. This resource is designed to assist owners, technicians, and mechanics in effectively troubleshooting, maintaining, and repairing the vehicle to ensure its optimal performance and longevity. 🏷️ Basic Information Identification Make: Mazda Model: 323 Protege Year: 1990 Trim Level: Protege 4-Wheel Drive Generation Chassis Code: BG 👋 Introduction Market Position Positioning: The 1990 Mazda 323 Protege was a popular compact car known for its practicality, fuel efficiency, and sporty handling. The 4-Wheel Drive variant offered enhanced traction for various weather conditions, making it a niche but desirable option. Competitive Analysis Competitors: Competed against vehicles like the Honda Civic, Toyota Corolla, Ford Escort, and Nissan Sentra in the compact segment. Key Features Features: Reliable mechanicals, engaging driving dynamics, affordable maintenance, and the added capability of 4-wheel drive. 📋 Manual Details Coverage Areas Engine: Yes Transmission: Yes Drivetrain: Yes (4-Wheel Drive) Brakes: Yes Suspension: Yes Steering: Yes Electrical System: Yes Body And Chassis: Yes Climate Control: Yes Diagnostics: Yes Wiring Diagrams: Yes Page Count Estimated Pages: 1000+ Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF (Likely Digital Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine removal/installation, cylinder head, pistons, connecting rods, crankshaft, camshaft, timing belt, lubrication system, cooling system. Engine Fuel And Emissions: Fuel injection system (EFI), fuel pump, fuel injectors, fuel filter, evaporative emission control (EVAP), exhaust system, catalytic converter. Engine Ignition: Ignition system, spark plugs, ignition coils, distributor (if applicable), ignition timing. Engine Management: ECU (Engine Control Unit) diagnosis, sensor testing (e.g., MAF, TPS, O2), troubleshooting electronic fuel injection. Transmission Manual: Clutch system, manual transmission assembly, gearshift linkage, repair procedures. Transmission Automatic: Automatic transmission operation, fluid checks, filter replacement, removal/installation, control systems (if applicable). Drivetrain 4Wd: Transfer case operation, front and rear differentials, driveshafts, CV joints, maintenance and repair of the 4WD system. Suspension Front: MacPherson struts, control arms, ball joints, bushings, springs, shock absorbers, wheel alignment specifications. Suspension Rear: Multi-link suspension (likely for Protege), trailing arms, shock absorbers, springs, bushings, wheel alignment specifications. Brakes Hydraulic: Brake system components, brake fluid specifications, bleeding procedures, master cylinder, brake lines, wheel cylinders, caliper repair. Brakes Friction: Brake pad replacement, brake disc/rotor inspection and replacement, brake shoe adjustment (if drum brakes in rear). Steering System: Power steering system, steering gear/rack and pinion, steering column, tie rods, power steering fluid specifications. Electrical Charging: Alternator, voltage regulator, battery specifications, charging system testing. Electrical Starting: Starter motor, starter solenoid, ignition switch, starting system troubleshooting. Lighting System: Headlights, taillights, interior lights, fuses, bulbs, wiring. Instrument Panel: Gauges, warning lights, dashboard illumination. Body Exterior: Body panel removal/installation, doors, hood, trunk lid, bumpers, trim pieces, glass replacement. Body Interior: Seat removal, dashboard disassembly, door panel removal, carpet, headliner, trim. HVAC: Heating system, air conditioning system components, refrigerant, blower motor, control panel. Procedures Included Scheduled Maintenance: Oil changes, filter replacements, spark plug replacement, coolant flushes, brake fluid changes, belt inspections/replacement, tune-ups. Troubleshooting: Diagnostic flowcharts for common problems (engine not starting, poor performance, electrical issues, etc.). Repair Procedures: Step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, and reassembly. Overhaul Procedures: Detailed instructions for major component overhauls, such as engine rebuilds, transmission overhauls. Diagnosis Testing: Procedures for testing sensors, actuators, relays, fuses, and other electrical components using multimeters and specialized tools. Alignment Adjustments: Wheel alignment procedures and specifications, steering angle adjustments. Technical Depth Depth: Comprehensive: Covers everything from basic maintenance to complete engine and transmission overhauls, including advanced diagnostics and electrical system troubleshooting. 📊 Manual Specifications File Format Format: Digital (PDF) Print Quality Quality: High-resolution, clear text and diagrams for easy reading and printing. Binding Type Type: N/A (Digital Format) Paper Type Type: N/A (Digital Format) Searchability Feature: Searchable text for quick access to specific information. Illustrations Type: Detailed diagrams, exploded views, and line drawings. ⚙️ Engine Specifications Primary Engine Engine Code: BP (Commonly used for this generation and engine size) Engine Type: Inline-4, DOHC (Double Overhead Camshaft)...