Positioning:
The Ferrari 328 GTS/GTB was the quintessential mid-engine V8 supercar of the late 1980s, representing a significant evolution from its predecessor, the 308. This wiring diagram manual is an essential tool for owners and technicians preserving or maintaining these iconic vehicles.
Competition:
Competed with contemporaries like the Porsche 911 (930), Lamborghini Jalpa, and Lotus Esprit Turbo, offering a unique blend of Italian styling, performance, and engineering.
Manual Value:
Crucial for understanding the complex electrical architecture, facilitating accurate diagnosis and repair of the 328's intricate systems, and preventing misdiagnosis by unqualified mechanics.
Electrical Systems:
Ignition system, fuel injection system, starting system, charging system, lighting (headlights, taillights, interior), instrumentation, HVAC controls, power windows, power mirrors, anti-lock braking system (ABS), central locking, diagnostic connectors, fuse box layouts, relay functions, grounding points, wiring harness routing.
Engine Management Wiring:
Detailed diagrams for the Bosch LE2-Jetronic fuel injection and ignition systems, including sensors, actuators, ECU connections, and wiring harnesses.
Lighting Circuits:
Complete schematics for all external and internal lighting, including headlights (low/high beam), taillights, brake lights, turn signals, parking lights, fog lights, and interior courtesy lights.
Instrumentation And Gauges:
Wiring for speedometer, tachometer, oil pressure, coolant temperature, fuel level, voltage, and warning lights.
Chassis Electrical:
Wiring for chassis components including lights, wipers, horn, power windows, door locks, and mirrors.
Troubleshooting:
Component identification via wire color and numbering, circuit tracing, diagnostic point identification, common electrical fault diagnosis.
Fuse And Relay Identification:
Clear identification and location of all fuse boxes and relays, along with their respective circuit functions.
Component Location:
Diagrams often indicate the physical location of key electrical components within the vehicle's chassis.
Wiring Harness Routing:
Information on how wiring harnesses are routed through the vehicle's body and chassis, crucial for diagnosis and repair.
Depth:
Detailed schematic representations of all electrical circuits, component locations, connector pinouts, and wire specifications.
Wire Colors And Labels:
Precise information on wire colors, gauge sizes, and terminal identification for accurate repairs and modifications.
Schematic Clarity:
Professionally drawn, clear, and detailed electrical schematics ensuring easy interpretation for technicians.
Engine Type:
Mid-mounted, 45-degree V8
Displacement:
3185 cc (3.2 Liters)
Bore X Stroke:
81 mm x 78 mm
Horsepower:
260 hp (194 kW) at 6500 rpm
Torque:
228 lb-ft (309 Nm) at 5000 rpm
Fuel Delivery:
Bosch LE2-Jetronic Fuel Injection
Fuel Type:
Unleaded gasoline
ECU:
Bosch Motronic M1.2 ECU
Ignition System:
Breakerless electronic ignition with distributor and ignition coil.
Safety Approvals:
While formal crash test ratings as we know them today were less prevalent, the 328 was designed to meet contemporary European safety standards.
Occupant Protection:
Integrated roll cage structure within the windshield frame, safety glass, three-point seatbelts.
Braking:
Ventilated disc brakes front and rear, ABS (Anti-lock Braking System) as standard on later models and optional on earlier ones. The wiring diagram would detail the ABS system's components and circuits.
Audio System:
Original systems typically included an AM/FM radio with cassette player, often from manufacturers like Blaupunkt or Pioneer. The wiring diagram will show the connections for these components.
ABS:
Anti-lock Braking System (ABS) was a significant technological feature for its time, improving stopping power and control under braking. The manual will provide detailed diagrams of its electrical operation.
Diagnostic Ports:
Basic diagnostic points and connectors were present, allowing technicians to access system data. The wiring diagram is critical for understanding these.
Major Service:
Typically every 7,500 miles or annually. Key items include engine oil and filter change, spark plug inspection/replacement, timing belt replacement (critical for this engine, usually every 30,000 miles or 5 years).
Minor Service:
Intermediate checks including fluid levels, tire pressures, and visual inspections.
Engine Oil:
API SG/SH, SAE 10W-40 or 15W-50 (check manual for precise viscosity based on climate). Oil Capacity: Approx. 11.4 liters (12 quarts) including filter.
Coolant:
High-quality ethylene glycol-based coolant with corrosion inhibitors. Capacity: Approx. 14 liters (14.8 quarts).
Brake Fluid:
DOT 3 or DOT 4.
Transmission Fluid:
GL-5 SAE 75W-90 or 80W-90 gear oil. Capacity: Approx. 3.5 liters (3.7 quarts).
Differental Fluid:
GL-5 SAE 75W-90 or 80W-90 gear oil. Capacity: Approx. 2.0 liters (2.1 quarts).
Coolant Type:
Antifreeze/Coolant Concentrate (e.g., Shellzone, Prestone) mixed 50/50 with distilled water.
Common Problems:
Degradation of fuel lines and vacuum hoses, fuel pump issues, electrical connector corrosion, starter motor issues, ignition coil failures, aging rubber bushings, dry-rotted seals, potential for timing belt failure if not replaced on schedule (catastrophic damage).
Electrical Quirks:
Intermittent electrical faults, warning lights, issues with power windows and door locks are common due to age and vibration. This wiring diagram is essential for diagnosing these.
Heritage:
Ferrari's legacy is built on motorsport and exotic road cars. The 328 continued the lineage of mid-engine V8 Ferraris, blending performance with usability.
Evolution:
The 328 was an evolution of the 308 series, featuring a larger displacement engine, revised styling cues (smoothed bumpers, larger rear vents), and improved aerodynamics. The GTB (Gran Turismo Berlinetta) was the coupe version, while the GTS (Gran Turismo Spider) featured a removable targa top.
Design Inspiration:
Pininfarina styling, showcasing classic Ferrari design language with muscular proportions and aerodynamic efficiency.
Production Years:
1985-1989
Production Numbers:
Approximately 7,700 units combined (GTB and GTS).
Manufacturing Location:
Maranello, Italy
