BMW E32 735I 735IL 750IL 7 Series 1988 Electronic TROUBLESHOOTING Manual

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🏷️ Basic Information Identification Make: BMW Model: 7 Series Chassis Code: E32 Year: 1988 Specific Models Covered: 735i, 735iL, 750iL 👋 Introduction Market Position Target Audience: Professional automotive technicians, BMW...

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类型: Car

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标签: 1988 7 Series 735I 735IL 750IL BMW Car Cars E32 Misc

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Description

🏷️ Basic Information

Identification

Make:

Model:

7 Series

Chassis Code:

Year:

Specific Models Covered:

735i, 735iL, 750iL

👋 Introduction

Market Position

Target Audience:

Professional automotive technicians, BMW specialists, and advanced DIY mechanics working on E32 7 Series vehicles.

Competitive Analysis

Value Proposition:

Provides specialized, in-depth troubleshooting for the complex electronic systems of the 1988 BMW 7 Series, addressing common and uncommon electronic faults.

Key Features

Diagnostic Focus:

Emphasis on systematic diagnosis of electronic issues, which were becoming increasingly sophisticated in luxury vehicles of this era.

Technical Accuracy:

Leverages BMW's technical documentation standards for the period, ensuring accuracy for repairs and diagnostics.

📋 Manual Details

Coverage Areas

Manual Type:

Electronic Troubleshooting Manual

Language:

English

Format:

Likely Digital (e.g., PDF, e-book). Specific format not explicitly stated, but 'Electronic' implies digital distribution.

Page Count

Estimated Page Count:

Specific page count not provided. However, electronic troubleshooting manuals for this era are typically substantial, often exceeding 300-500 pages.

📖 Manual Coverage

Systems Covered

Primary Focus:

Electronic Systems and Troubleshooting

Engine Management Electronics:

Diagnosis and troubleshooting of engine control unit (ECU) functions, sensors, actuators, and associated wiring for M30 engines.

Ignition System Electronics:

Troubleshooting electronic ignition control, coil packs, and related components.

Fuel Injection Electronics:

Diagnosis of electronic fuel injection (EFI) system components, including injectors, fuel pumps, and control modules.

Transmission Control Electronics:

Troubleshooting electronic control unit (ECU) and sensors for automatic transmissions.

Chassis Electronics:

Diagnosis of ABS (Anti-lock Braking System), ASC (Automatic Stability Control - if applicable to 1988 models), and other chassis-related electronic modules.

Body Electronics:

Troubleshooting electronic components within the body, such as central locking, power windows, mirrors, and climate control systems.

Instrument Cluster Electronics:

Diagnosis of dashboard warning lights, gauges, and electronic displays.

Lighting Electronics:

Troubleshooting headlight, taillight, and interior lighting control modules and wiring.

Diagnostic Interfaces:

Information on diagnostic connectors, fault codes, and basic diagnostic procedures available for the era.

Procedures Included

Troubleshooting Methodology:

Step-by-step diagnostic routines and logical troubleshooting trees.

Wiring Diagrams:

Detailed electrical schematics for various systems.

Component Testing:

Procedures for testing sensors, actuators, and electronic modules using multimeters and oscilloscopes.

Fault Code Interpretation:

Explanation of diagnostic trouble codes (DTCs) and their meanings.

Component Replacement:

Guidance on replacing electronic components, including necessary precautions.

Connector Pinouts:

Detailed pin assignments for various electrical connectors.

Technical Depth

Depth Of Coverage:

Advanced diagnostics focusing on electronic systems, suitable for professional technicians and advanced DIY enthusiasts.

Diagnostic Tools Required:

Implies the use of standard automotive diagnostic tools such as multimeters, oscilloscopes, and potentially basic scan tools of the era.

📊 Manual Specifications

File Format

Digital Format Type:

Likely PDF or similar document format, potentially with search functionality.

Print Quality

Print Quality Suitability:

Designed for digital viewing. If printed, quality would depend on the user's printer.

Binding Type

Binding Type For Digital:

N/A (Digital format)

Paper Type

Paper Type For Digital:

N/A (Digital format)

⚙️ Engine Specifications

Primary Engine

Engine Code 735I 735Il:

M30B35

Engine Type 735I 735Il:

3.5L (3430cc) Inline 6-cylinder, SOHC, 12-valve

Engine Code 750Il:

M70B50

Engine Type 750Il:

5.0L (4988cc) V12, SOHC, 24-valve

Performance

Horsepower 735I 735Il:

Approx. 208 hp @ 5700 rpm (DIN)

Torque 735I 735Il:

Approx. 224 lb-ft @ 4000 rpm (DIN)

Horsepower 750Il:

Approx. 296 hp @ 5200 rpm (DIN)

Torque 750Il:

Approx. 332 lb-ft @ 3900 rpm (DIN)

Fuel System

Fuel Delivery 735I 735Il:

Bosch Motronic electronic fuel injection (EFI)

Fuel Delivery 750Il:

Dual Bosch Motronic M1.2 or M1.3 electronic fuel injection (EFI) systems (one per bank)

Fuel Type:

Premium Unleaded Gasoline (91+ Octane)

🔧 Transmission

Standard

Transmission Type 735I:

4-speed Automatic (Getrag 4HP22) or 5-speed Manual

Transmission Type 735Il:

4-speed Automatic (Getrag 4HP22)

Transmission Type 750Il:

4-speed Automatic (Getrag 4HP22 EH)

Optional

Manual Transmission Availability:

Available on 735i, less common.

Features

Sport Mode Automatic:

Some automatic transmissions featured a 'Sport' mode for enhanced performance characteristics.

Electronic Control Automatic:

The 4HP22 EH transmission in the 750iL featured electronic control for smoother shifting and efficiency.

📐 Dimensions

Exterior

Length 735I:

Approx. 5014 mm (197.4 in)

Length 735Il 750Il:

Approx. 5114 mm (201.3 in)

Wheelbase 735I:

Approx. 2830 mm (111.4 in)

Wheelbase 735Il 750Il:

Approx. 2904 mm (114.3 in)

Width:

Approx. 1800 mm (70.9 in)

Height:

Approx. 1400 mm (55.1 in)

Weights

Curb Weight 735I:

Approx. 1700-1800 kg (3748-3968 lbs)

Curb Weight 735Il:

Approx. 1800-1900 kg (3968-4189 lbs)

Curb Weight 750Il:

Approx. 1950-2050 kg (4300-4520 lbs)

🛡️ Safety Features

Ratings

Safety Ratings Era:

Safety standards and testing protocols were less standardized than today. Specific NCAP ratings for this era are generally unavailable or not directly comparable.

Active Features

Anti-lock Braking System (ABS) was standard on most models or widely available as an option.

Automatic Stability Control (ASC) or ASC+T (with Traction Control) became available on later E32 models, potentially including late 1988 production.

Passive Features

Airbags:

Driver's side airbag was introduced as an option or standard on later 1988 or early 1989 models. Passenger airbag was not common in 1988.

Seatbelts:

Three-point inertia-reel seatbelts for front occupants, with rear seatbelts.

Body Structure:

Reinforced passenger cell and crumple zones designed for the era.

💡 Technology Features

Infotainment

Audio System:

Premium sound systems from brands like Blaupunkt or BMW's own offerings, often with cassette player and radio. CD changers were available as options.

Climate Control:

Automatic climate control system with electronic sensors and actuators for maintaining cabin temperature.

Driver Assistance

Cruise Control:

Electronic cruise control system.

Onboard Computer:

Early form of onboard computer providing information on fuel economy, range, and service intervals.

Connectivity

Connectivity Options Era:

Limited by modern standards. Primarily focused on in-car entertainment. No external connectivity (Bluetooth, USB) available.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 7,500-10,000 miles or 12 months, using synthetic oil. Owner's manual specific recommendation is best.

Service Indicator System:

On-board computer or service indicator lights (e.g., 'Oil Service', 'Inspection') would signal required maintenance based on mileage or time.

Fluid Specifications

Engine Oil Type 735I 735Il:

SAE 15W-40 or 15W-50 synthetic recommended, check owner's manual for specific BMW approval (e.g., BMW High Performance Synthetic).

Engine Oil Type 750Il:

SAE 5W-30 or 5W-40 synthetic recommended for V12, subject to BMW specifications.

Coolant Type:

BMW Blue Coolant (or equivalent G48 ethylene glycol-based coolant) mixed with distilled water.

Transmission Fluid Automatic:

Dexron III (or equivalent ATF specification for Getrag 4HP22 transmissions).

Brake Fluid Type:

DOT 4

Known Issues

Engine M30 Common Issues:

Head gasket leaks, valve cover gasket leaks, oil pan gasket leaks, oil leaks from oil filter housing, worn motor mounts, intake manifold vacuum leaks.

Engine M70 Common Issues:

Spark plug wire failures (especially the ignition coil distribution system), ECU failures, coolant leaks, idle control valve issues, oil leaks.

Electrical System Common Issues:

Failing door modules, EWS immobilizer issues (if applicable), intermittent power windows/locks, dashboard warning light malfunctions, ABS sensor failures, corroded wiring harnesses.

Cooling System Common Issues:

Plastic coolant reservoir cracks, water pump leaks, thermostat housing leaks, heater control valve failures.

Suspension Common Issues:

Worn control arm bushings, shock absorber leaks, self-leveling rear suspension issues (if equipped).

📚 Vehicle History

Brand Heritage

Bmw Brand Positioning:

BMW established itself as a manufacturer of luxury, sporty sedans with advanced engineering and driver focus.

Model Evolution

E32 Generation Introduction:

The E32 generation replaced the E23 7 Series and was produced from 1986 to 1994. The 1988 model represents one of the earlier years of this generation.

Key Advancements E32:

Introduction of V12 engine, advanced electronics, and a more aerodynamic design compared to its predecessor.

Production

Production Period:

1986-1994

Manufacturing Location:

Germany

🏆 Awards & Recognition

Recognitions

E32 Reputation:

The E32 7 Series was widely praised for its luxury, comfort, advanced technology for its time, and refined driving dynamics, cementing BMW's position in the flagship luxury sedan market.

V12 Engine Recognition:

The M70 V12 engine was a technological marvel of its era, contributing to the 750iL's reputation as a pinnacle of automotive engineering.