Target Audience:
Ferrari 328 GTB/GTS owners, independent Ferrari specialists, automotive technicians
Historical Significance:
The 328 represents a pivotal point in Ferrari's V8 evolution, offering a blend of performance and a more approachable ownership experience than its predecessors.
Manual Advantage:
Provides OEM-level electrical diagnostic information, enabling accurate and cost-effective repairs compared to generic guides
Documentation Quality:
Utilizes original Ferrari schematics, ensuring accuracy and detail for complex Italian V8 electronics
Electrical Systems:
Engine Management (Fuel Injection, Ignition), Lighting (Headlights, Taillights, Indicators), Instrumentation, HVAC Control, Power Windows, Power Locks, Wipers/Washers, Audio System, Exterior/Interior Lights, Battery Charging System, Starter System
Engine Management Wiring:
Detailed schematics for fuel injectors, ignition coils, ECU inputs/outputs, lambda sensors (if applicable), airflow meter, and related sensors.
Lighting Circuits:
Complete wiring diagrams for all exterior and interior lighting functions, including headlamps (high/low beam), turn signals, brake lights, parking lights, reverse lights, license plate illumination, and interior courtesy lights.
Instrumentation Wiring:
Wiring for the speedometer, tachometer, fuel gauge, oil pressure gauge, coolant temperature gauge, and warning lights (oil pressure, brake system, engine check).
HVAC Electrical:
Wiring for the blower motor, A/C compressor clutch, temperature control module, and associated switches.
Power Accessories:
Diagrams for power window motors, power door locks, and seat adjustment mechanisms (if applicable).
Diagnostic Procedures:
Wiring harness tracing, connector identification, component testing, fault diagnosis based on symptoms, continuity testing, voltage drop testing
Troubleshooting Methodology:
Systematic approach to identifying electrical faults using the provided diagrams, including component identification and resistance/voltage checks.
Component Testing:
Guidance on testing common electrical components such as relays, solenoids, switches, and sensors using a multimeter.
Depth:
Detailed component-level wiring, circuit diagrams, fuse box layouts, relay assignments, connector pinouts, ground point locations, troubleshooting flowcharts (implied by 'solving electrical problems')
Wiring Diagram Format:
Component-level diagrams showing wire colors, terminal numbers, connector housings, and routing within the vehicle's harness.
Fuse And Relay Identification:
Clear identification of fuse box locations, fuse ratings, and relay functions for critical electrical circuits.
Engine Type:
Naturally Aspirated V8
Engine Code:
F106CB.040 (328 GTB), F106CB.040 (328 GTS)
Displacement:
3186 cc (3.2 Liters)
Horsepower:
270 hp @ 7000 rpm (US Spec)
Torque:
227 lb-ft (308 Nm) @ 5500 rpm (US Spec)
Fuel Delivery:
Bosch K-Jetronic CIS (Continuous Injection System) with Bosch LE2-Jetronic engine control
Cis Characteristics:
K-Jetronic's mechanical fuel distribution requires precise adjustment and can be sensitive to vacuum leaks and component wear.
Ignition Type:
Electronic Ignition (Distributorless in later iterations, but 1989 likely still distributor)
Engine Variant Note:
The F106 engine family is a dry-sump lubrication system for optimal performance under high G-forces.
Major Service:
Typically every 7,500 miles or 12 months, including timing belt replacement (critical for this V8 engine)
Engine Oil:
API SG, ACEA A3/B3, SAE 15W-50 or 20W-50 (refer to manual for exact recommendation, often full synthetic)
Coolant:
50/50 mix of high-quality ethylene glycol coolant and distilled water
Brake Fluid:
DOT 4, high-performance (e.g., Castrol SRF, Motul RBF 600)
Transmission Fluid:
GL-5 75W-90 Synthetic Gear Oil
Electrical Quirks:
Degradation of wire insulation (especially common in Italian cars of this era), faulty fuel pump relays, injector circuit issues, dashboard warning light malfunctions, alternator output fluctuations.
Mechanical Points:
Timing belt replacement frequency (vital), carburetor/fuel injection system tuning, exhaust system integrity, clutch wear.
Wiring Insulation Type:
The specific type of wire insulation used in Ferraris of this period is known to become brittle and prone to cracking, leading to short circuits and intermittent faults.
