🏷️ Basic Information Identification Make: BMW Model: 3 Series Model Variant: 325i Convertible Chassis Code: E30 Model Years Covered: 1987 Trim Levels Covered: i, ES, CONVERT. Codes Engine Code Likely: M20B25 👋 Introduction Market Position Target Audience: Professional BMW technicians, independent repair shops, and knowledgeable DIY enthusiasts specializing in E30 generation BMWs. Competitive Analysis Value Proposition: Provides the same level of detailed electrical troubleshooting information used by authorized BMW garages, enabling accurate diagnosis and repair of complex electrical issues. Key Features Unique Selling Point: Specialized focus on electrical systems, which are often the most challenging to diagnose and repair in older vehicles like the E30. Utility: Essential resource for maintaining the reliability and functionality of the E30 325i Convertible, particularly its advanced (for the era) electrical systems. 📋 Manual Details Coverage Areas Manual Title: BMW 325i E30 ES CONVERT. 1987 Electrical Troubleshooting Manual Primary Focus: Electrical Systems Troubleshooting Overall Coverage: Front to back of the car, with a specific emphasis on electrical diagnostics and repair. Page Count Estimated Page Count: Likely between 150-300 pages, typical for dedicated electrical troubleshooting manuals. Manual Type Manual Type: Specialized Electrical Troubleshooting Manual / Service Manual Language Language: English (implied by product description) Format Format: Likely printed manual, as it mirrors workshop documentation. 📖 Manual Coverage Systems Covered Electrical Systems Detailed: All automotive electrical circuits including ignition, starting, charging, lighting (headlights, taillights, interior), instrumentation, fuel injection, engine management, ABS (if equipped), power windows, mirrors, seats, convertible top operation, HVAC controls, audio system, and diagnostic connectors. Wiring Diagrams: Comprehensive, color-coded wiring diagrams for all vehicle systems. Component Location: Detailed diagrams and descriptions for locating electrical components, fuses, relays, and grounds. Procedures Included Troubleshooting Methodology: Systematic diagnostic procedures, fault finding trees, symptom-based troubleshooting, and common electrical problem diagnosis. Repair Procedures: Step-by-step instructions for repairing electrical faults, including connector repair, wire splicing, component replacement, and circuit continuity testing. Testing Procedures: Instructions for testing electrical components, sensors, actuators, and control modules using multimeters, oscilloscopes, and diagnostic tools. Technical Depth Diagnostic Level: Advanced diagnostic capabilities, suitable for professional technicians and advanced DIYers. Covers circuit analysis and fault isolation. Repair Scope: Comprehensive repair procedures for all electrical systems, from minor wiring fixes to major component replacement. 📊 Manual Specifications File Format Physical Format: Printed hard copy, designed for workshop use. Bound for durability. Print Quality Print Quality: Professional quality printing with clear diagrams and text. Likely uses high-quality paper for durability in a workshop environment. Binding Type Binding Type: Likely spiral-bound or case-bound to lay flat for ease of use during repairs. Paper Type Paper Type: Durable, possibly coated paper to resist grease and dirt in a workshop setting. ⚙️ Engine Specifications Primary Engine Engine Type: Inline 6-cylinder, DOHC (Dual Overhead Camshaft) Engine Code: M20B25 Displacement: 2.5 Liters (2494 cc) Bore X Stroke: 84.0 mm x 75.0 mm Compression Ratio: 8.8:1 Engine Management: Bosch Motronic (likely Motronic 1.3) Performance Horsepower: 171 hp @ 5800 rpm Torque: 225 Nm (166 lb-ft) @ 4300 rpm Fuel System Fuel Delivery: Bosch L-Jetronic (early) or Motronic fuel injection system Fuel Type: Unleaded Premium (91 Octane or higher) Fuel Pump Type: In-tank electric fuel pump 🔧 Transmission Standard Transmission Type Std: 5-speed manual transmission Optional Transmission Type Opt: 4-speed automatic transmission Features Clutch Type: Hydraulically operated single dry plate clutch Transmission Fluid Spec Manual: BMW MTF LT-2 (or equivalent high-quality gear oil, e.g., GL-4 75W-90) Transmission Fluid Spec Auto: Dexron III (or equivalent) 📐 Dimensions Exterior Length: 4340 mm (170.9 in) Width: 1675 mm (65.9 in) Height: 1370 mm (53.9 in) Wheelbase: 2565 mm (100.9 in) Weights Curb Weight: Approx. 1350-1400 kg (2976-3086 lbs), depending on transmission and options 🛡️ Safety Features Ratings Crash Test Data Era: While formal crash test ratings like modern NCAP were not standard in 1987, the E30 chassis was known for its robust build and safety features for its time. The manual may reference internal BMW safety data. Active Features ABS: Optional Anti-lock Braking System (ABS) available on some models/trims. Electrical troubleshooting for ABS sensors, module, and pump is crucial. Passive Features Seatbelts: Three-point inertia-reel seatbelts front and rear. Early models may have manual belt adjustment. Structure: Reinforced chassis and safety cage design, characteristic of BMW's engineering for occupant protection. Convertible Structure: Reinforced A-pillars and chassis design to compensate for the lack of a fixed roof. Manual likely details any specific electrical interlocks or safety features related to the convertible top mechanism. 💡 Technology Features Infotainment Audio System: Factory premium sound system often included upgraded speakers and amplifier. Manual will detail wiring for diagnosis. Driver Assistance ABS Operation: The manual's electrical focus will be critical for diagnosing any issues with the optional ABS system, including sensor readings and hydraulic unit function. Connectivity Diagnostic Ports: Likely includes information on early diagnostic connectors (e.g., the 14-pin diagnostic connector) used for accessing engine control...