The Chevrolet Beretta, produced for the 1990 model year and based on the GM L-body platform, represents a compact sports coupe and performance sedan designed with aerodynamic styling and a focus on both performance and fuel economy. As a division of General Motors, Chevrolet aimed to offer a competitive vehicle in its segment, with this particular model being recognized by Popular Mechanics in 1990. It was available with a 2.3L Quad-4 engine producing 160 horsepower or a 3.1L V6 engine delivering 140 horsepower, paired with either a 3-speed automatic or a 5-speed manual transmission. This comprehensive factory service manual provides detailed information essential for the maintenance, repair, and diagnostics of your 1990 Chevrolet Beretta. It covers all major systems, including the powertrain with engine and transmission specifics, chassis components such as suspension and brakes, and the electrical system with complete wiring diagrams. Furthermore, the manual details bodywork, routine maintenance procedures, troubleshooting guidance, and specific repair operations, offering factory-level insight to assist owners and technicians in keeping the vehicle in optimal condition. 🏷️ Basic Information Identification Make: Chevrolet Model: Beretta Year: 1990 Codes Platform Code: GM L-body 👋 Introduction Market Position Segment: Compact Sports Coupe / Performance Sedan Competitive Analysis Competitors: Ford Probe, Honda Prelude, Toyota Celica, Mitsubishi Eclipse Key Features Design Philosophy: Aerodynamic styling, front-wheel-drive platform, focus on performance and fuel economy. Manual Benefit: Provides detailed OE information for DIY repairs, saving money and ensuring correct procedures. 📋 Manual Details Coverage Areas Primary Coverage: Service, Repair, Maintenance, Diagnostics, Troubleshooting Page Count Estimated Pages: 1500+ Manual Type Type: Factory Service Manual (Digital Software) Language Language: English Format Format: PDF Download (Software Access) 📖 Manual Coverage Systems Covered Powertrain: Engine (2.3L Quad-4, 3.1L V6), Transmission (3-speed Automatic TH125-3C, 5-speed Manual Getrag G240) Chassis: Suspension (Front MacPherson Struts, Rear Independent Trailing Arm), Steering (Rack and Pinion), Brakes (Front Disc, Rear Drum) Electrical: Wiring Diagrams, Lighting, Instruments, Fuses, Relays, Ignition System, Starting System, Charging System Body: Body Panels, Doors, Windows, Seats, Interior Trim, Climate Control (HVAC) Procedures Included Routine Maintenance: Oil Changes, Fluid Replacements, Filter Changes, Spark Plug Replacement, Belt Inspection/Replacement Diagnostics: Troubleshooting charts, Symptom analysis, Diagnostic trouble codes (DTCs) for Engine Control Module (ECM) Repair Operations: Engine rebuild, Transmission overhaul, Brake system repair, Suspension component replacement, Steering system repair, Electrical component diagnosis and replacement Technical Depth Depth: Comprehensive factory-level detail, including torque specifications, assembly procedures, and diagnostic flowcharts. 📊 Manual Specifications File Format File Type: Searchable PDF Print Quality Resolution: High-resolution scans of original factory documentation Binding Type Binding: Digital Download (No physical binding) Paper Type Paper: N/A (Digital) ⚙️ Engine Specifications Primary Engine Engine 1 Displacement: 2.3 Liters (140 cu in) Engine 1 Code: LQ1 (Quad-4) Engine 1 Configuration: Inline-4, DOHC, 16 Valves Engine 1 Horsepower: 160 hp @ 6000 rpm Engine 1 Torque: 150 lb-ft @ 4800 rpm Secondary Engine Engine 2 Displacement: 3.1 Liters (189 cu in) Engine 2 Code: LHO (3.1L V6) Engine 2 Configuration: V6, OHV, 12 Valves Engine 2 Horsepower: 140 hp @ 4800 rpm Engine 2 Torque: 180 lb-ft @ 2800 rpm Fuel System Fuel Delivery: Electronic Fuel Injection (EFI) 🔧 Transmission Standard Transmission Type Standard: 3-Speed Automatic (TH125-3C) Optional Transmission Type Optional: 5-Speed Manual (Getrag G240) Features Transmission Fluid Spec Auto: Dexron III Automatic Transmission Fluid (ATF) Transmission Fluid Spec Manual: GM Manual Transmission Fluid, Spec. #1052275 📐 Dimensions Exterior Length: 179.7 inches Width: 67.2 inches Height: 52.5 inches Wheelbase: 102.4 inches Weights Curb Weight Est Min: 2800 lbs Curb Weight Est Max: 3000 lbs 🛡️ Safety Features Ratings NHTSA Driver Front Impact: Not Rated (1990 standards) NHTSA Passenger Front Impact: Not Rated (1990 standards) Active Features ABS: Optional on some trims Passive Features Airbags: Driver-side airbag standard Seatbelts: Front 3-point, Rear 2-point 💡 Technology Features Infotainment Audio System: AM/FM stereo with cassette player, optional CD player on higher trims. Driver Assistance Cruise Control: Available on most trims Connectivity Features: Basic connectivity, primarily focused on audio. 🔧 Maintenance Service Intervals Oil Change Interval Miles: 7,500 miles or 6 months Engine Coolant Flush Interval Miles: 30,000 miles or 24 months Automatic Transmission Fluid Change Interval Miles: 50,000 miles (under normal driving) Fluid Specifications Engine Oil Specification: API Service SG or SH, SAE 5W-30 (preferred in most climates) Engine Coolant Specification: GM 6043-M, Ethylene Glycol based (Green) Power Steering Fluid Specification: GM P/N 1050001 or Dexron II/III ATF Known Issues Quad4 Head Gasket: Potential for head gasket failure, particularly with early models or inadequate coolant maintenance. Electrical Gremlins: Common for aging wiring harnesses, grounds, and sensor failures in GM vehicles of this era. Dashboard Cracking: Sun exposure can cause dashboard material to become brittle and crack. 📚 Vehicle History Brand Heritage Manufacturer: Chevrolet, a division of General Motors (GM) Model Evolution Introduction Year: 1987 Generation Period: 1987-1994 Production Manufacturing Location: Lordstown, Ohio, USA 🏆 Awards & Recognition...