PORSCHE 928 S Model 89 Wiring Diagram

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🏷️ Basic Information Identification Make: Porsche Model: 928 Model Variant: S Model Year Covered: 1989 Codes Chassis Code: 928 Engine Code General: M28/49 👋 Introduction Market Position Vehicle Segment: Luxury...

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类型: Car

斯库: 312414

标签: 1989 928 928 S Car Cars Porsche

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Description

🏷️ Basic Information

Identification

Make:

Porsche

Model:

Model Variant:

Model Year Covered:

Codes

Chassis Code:

Engine Code General:

M28/49

👋 Introduction

Market Position

Vehicle Segment:

Luxury Grand Tourer (GT)

Brand Perception:

High-performance, engineering excellence, luxury

Competitive Analysis

Competitors Era:

Ferrari 400i/412, Aston Martin V8 Vantage, Jaguar XJS

Key Features

Unique Selling Proposition:

Front-engine V8, rear transaxle, advanced engineering for its time, comfortable yet sporty GT

Manual Value Proposition

Target Audience:

Porsche 928 owners, independent mechanics, automotive enthusiasts with electrical diagnostic skills

Cost Saving Potential:

Enables DIY troubleshooting and repair, reducing reliance on expensive dealership or specialist labor for electrical issues

📋 Manual Details

Coverage Areas

Primary Focus:

Electrical Systems and Troubleshooting

Secondary Focus:

Component Identification, Wiring Schematics, Diagnostic Procedures

Page Count

Estimated Pages:

Manual Type

Type:

Wiring Diagram Manual / Electrical Troubleshooting Manual

Language

Language:

English

Format

Format:

Digital (likely PDF)

📖 Manual Coverage

Systems Covered

Powertrain Electrical:

Engine Control Unit (ECU), Fuel Injection, Ignition System, Starter, Alternator

Chassis Electrical:

Braking System (ABS), Power Steering, Suspension Control (if applicable)

Body Electrical:

Lighting (Headlights, Taillights, Interior), Wipers, Horn, Central Locking, Power Windows, Power Seats, Mirrors

Comfort Convenience:

Climate Control (HVAC), Cruise Control, Audio System, Instrumentation Cluster, Warning Lights

Safety Security:

Airbag System (if equipped), Alarm System

Procedures Included

Troubleshooting:

Step-by-step diagnostic flows, symptom-based problem solving

Repair Tasks:

Component replacement, wire repair, connector servicing

Installation:

Wiring harness installation/replacement (general guidance)

Technical Depth

Depth:

Detailed component locations, connector pinouts, wire colors, fuse/relay assignments, circuit diagrams

📊 Manual Specifications

File Format

Digital Format:

Searchability:

Text-searchable (if properly OCR'd)

Print Quality

Clarity:

High-resolution diagrams and text

Binding Type

Binding:

N/A (Digital Format)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

V8, Naturally Aspirated

Displacement:

4.7 Liters (for early 928 S)

Displacement 1989 Model:

5.0 Liters (for 928 S4, which likely applies to '89 model year)

Bore X Stroke 5.0L:

97.0 mm x 84.0 mm

Compression Ratio 5.0L:

10.0:1

Performance

Horsepower 5.0L:

316 hp (235 kW) at 6000 rpm (Euro Spec), 306 hp (225 kW) for US Spec

Torque 5.0L:

315 lb-ft (427 Nm) at 4800 rpm (Euro Spec), 320 lb-ft (434 Nm) for US Spec

Fuel System

Fuel Delivery:

Bosch L-Jetronic Fuel Injection (later Motronic)

Fuel Type:

Unleaded Premium Gasoline

Cooling System

Cooling Type:

Liquid-cooled

Engine Management

ECU Type Common:

Bosch Motronic

🔧 Transmission

Standard

Transmission Type Standard:

5-Speed Manual transaxle (G50 gearbox became more prevalent for later models)

Optional

Transmission Type Optional:

3-Speed Automatic (automatic with manual override later)

Features

Drive Layout:

Rear-wheel drive (RWD) with rear transaxle

Transaxle Design:

Integrated clutch and gearbox for weight distribution and handling balance

📐 Dimensions

Exterior

Length:

Approx. 4,655 mm (183.3 in)

Width:

Approx. 1,775 mm (69.9 in)

Height:

Approx. 1,280 mm (50.4 in)

Wheelbase:

Approx. 2,447 mm (96.3 in)

Weights

Curb Weight Manual:

Approx. 1,560 kg (3,439 lbs)

Curb Weight Automatic:

Approx. 1,580 kg (3,483 lbs)

Gross Vehicle Weight Rating:

Approx. 2,030 kg (4,475 lbs)

Towing Capacity:

Not Recommended

🛡️ Safety Features

Ratings

NHTSA Ratings:

N/A (Testing standards and availability varied significantly in the 1980s)

IIHS Ratings:

N/A (IHHS was not established in its current form)

Active Features

Standard on 1989 models (Bosch ABS II)

Traction Control:

Optional (ASR - Automatic Slip Regulation) on some later models, but less common for the '89 S

Passive Features

Airbags:

Driver-side airbag standard for 1989 models

Seatbelts:

3-point front and rear seatbelts

Body Structure:

Reinforced chassis and crumple zones

💡 Technology Features

Infotainment

Audio System:

Premium sound system, often Blaupunkt or Becker units with cassette player

Speakers:

Multiple speaker configurations, including door-mounted and rear shelf speakers

Driver Assistance

Cruise Control:

Standard feature

Instrumentation:

Comprehensive analog gauges including tachometer, speedometer, oil pressure, oil temperature, voltmeter, and fuel level

Connectivity

OBD Ii Port:

N/A (OBD-II standard was not in widespread use in 1989; diagnostic connectors are proprietary)

Comfort Features

Climate Control:

Automatic climate control (HVAC) with electronic sensors

Power Features:

Power windows, power adjustable seats, power mirrors

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 5,000-7,500 miles or 1 year, whichever comes first (consult specific owner's manual)

Timing Belt Interval:

Every 30,000 miles or 3 years (crucial for V8 engine)

Brake Fluid Flush:

Every 2 years

Fluid Specifications

Engine Oil Type Viscosity:

SAE 5W-40 or 10W-40 synthetic (check owner's manual for exact specs and API rating)

Coolant Type:

Porsche approved antifreeze, typically a silicate-free G12 or similar specification

Transmission Fluid Manual:

GL-4 or GL-5 gear oil, SAE 75W-90

Transmission Fluid Automatic:

Dexron II or III (check specific model year)

Brake Fluid Type:

DOT 4

Known Issues

Electrical Common Complaints:

Faulty door lock actuators, intermittent gauge cluster issues, HVAC blower motor failures, headlight switch problems, aging wiring insulation breakdown

Mechanical Common Complaints:

Timing belt failure (catastrophic), water pump leaks, coolant hoses deterioration, CV joint wear, pop-up headlight mechanism issues

Filter Part Numbers

Oil Filter Part Number Example:

Mann-Filter W 920/1, Mahle OC 27

Air Filter Part Number Example:

Mann-Filter C 33 410

📚 Vehicle History

Brand Heritage

Manufacturer:

Porsche AG

Founding Era:

1931 (Ferdinand Porsche)

Model Evolution

Introduction Year:

Significant Updates Leading To 89:

Introduction of 928 S (1978/79), S2 (1980), S3 (US Spec - 1984), S4 (1986) with significant engine power, suspension, and aerodynamic improvements.

1989 Specific Features:

Continued refinement of the S4 model, potentially minor electrical or comfort feature updates.

Production

Production Years:

1977-1995

Manufacturing Location:

Stuttgart, Germany

Total Production Numbers:

Approx. 61,000 units across all variants

🏆 Awards & Recognition

Recognitions

Car And Driver Ten Best:

Named to Car and Driver's Ten Best list multiple times in its early years, though not specifically for the 1989 model year

General Reputation:

Widely regarded as a technological tour de force and a benchmark for GT cars of its era