🏷️ Basic Information

Make:

BMW

Model:

7 Series

Chassis Code:

E32

Specific Models Covered:

735i, 735iL, 750iL

Years Covered:

1991, 1992

Manual Title:

BMW E32 735i 735iL 750iL 7 Series 1991 1992 Electronic Troubleshooting Manual

👋 Introduction

Target Audience:

Professional BMW technicians, independent repair shops, and advanced automotive enthusiasts specializing in E32 models.

Value Proposition:

Provides in-depth electronic diagnostic and troubleshooting expertise specifically for the complex systems of the 1991-1992 BMW E32 7 Series.

Uniqueness:

Focuses specifically on electronic troubleshooting, a critical but often underserviced area for older luxury vehicles.

Diagnostic Focus:

Prioritizes fault identification and resolution for electronic control units (ECUs) and related components.

Comprehensiveness:

Covers a wide array of the vehicle's electronic systems, offering a holistic diagnostic approach.

Practicality:

Aimed at facilitating efficient and accurate repair of electronic issues, reducing diagnostic time and cost.

📋 Manual Details

Primary Coverage:

Electronic Troubleshooting

Secondary Coverage:

Diagnostic procedures, fault finding, electrical system analysis

Estimated Page Count:

Detailed (Exact count not provided in product info, but expected to be extensive for electronic troubleshooting)

Type:

Electronic Troubleshooting Manual

Language:

English

Format:

Electronic (Likely PDF, CD-ROM, or digital download)

📖 Manual Coverage

Engine Management:

Detailed coverage of DME (Digital Motor Electronics), fuel injection, ignition timing, idle control, emission control systems.

Transmission Control:

Troubleshooting for automatic transmission control modules (EGS).

Chassis Electronics:

ABS (Anti-lock Braking System), ASC (Automatic Stability Control), EDC (Electronic Damper Control) diagnostics.

Body Electronics:

Climate control, central locking, power windows, mirrors, seat adjustment, interior lighting, warning indicators.

Instrumentation:

Diagnosis of instrument cluster functions, warning lights, and onboard computer (BC).

Infotainment And Comfort:

Radio, cassette, CD changer, and climate control system fault finding.

Lighting System:

Headlights, taillights, interior lights, fog lights, and associated control modules.

Diagnostics Tools:

Information on using BMW diagnostic tools (e.g., GT1, MoDiC) relevant to the E32 generation.

Wiring Diagrams:

Extensive wiring diagrams for all covered electronic systems.

Troubleshooting Methodology:

Systematic diagnostic flowcharts and step-by-step troubleshooting procedures for common and rare electronic faults.

Component Testing:

Procedures for testing sensors, actuators, control modules, and wiring harnesses using multimeters and oscilloscopes.

Fault Code Interpretation:

Explanation of diagnostic trouble codes (DTCs) and their probable causes.

Component Replacement:

Guidance on safe and correct removal and installation of electronic components, including control modules.

System Reset And Recalibration:

Procedures for resetting learned values and recalibrating electronic systems after component replacement.

Depth:

Advanced diagnostic and repair procedures, suitable for professional technicians and experienced DIYers with electronics knowledge.

Diagnostic Tools Reliance:

Emphasizes the use of specialized diagnostic equipment alongside manual testing methods.

📊 Manual Specifications

File Type:

Likely PDF (Portable Document Format)

Searchability:

Expected to have searchable text for quick access to information.

Printability:

Designed for printing individual pages or sections as needed.

Visuals:

High-quality diagrams, schematics, and illustrations.

Binding:

Not applicable for electronic format; if printed, typically spiral-bound or comb-bound for lay-flat usability.

Paper Quality:

Not applicable for electronic format; if printed, typically high-quality, durable paper.

⚙️ Engine Specifications

Engine Code:

M30B35

Engine Type:

SOHC Inline-6 (Gasoline)

Displacement:

3.5 Liters (3430 cc)

Bore X Stroke:

92 mm x 86 mm

Compression Ratio:

8.0:1 (Typically)

Horsepower:

208 hp @ 5700 rpm (Approx.)

Torque:

224 lb-ft @ 4000 rpm (Approx.)

Fuel System:

Bosch Motronic ML-S (Electronic Fuel Injection with Engine Management)

Ignition System:

Distributorless ignition system with individual spark coils (later M30 variations).

Emissions Control:

Catalytic converter, EGR (Exhaust Gas Recirculation) system, Lambda sensor.

Engine Code:

M70B50

Engine Type:

SOHC V12 (Gasoline)

Displacement:

5.0 Liters (4988 cc)

Bore X Stroke:

84 mm x 75 mm

Compression Ratio:

8.8:1 (Typically)

Horsepower:

296 hp @ 5200 rpm (Approx.)

Torque:

332 lb-ft @ 3900 rpm (Approx.)

Fuel System:

Bosch Motronic M7.1 (Dual DME systems for V12 operation)

Ignition System:

Dual ignition system with two spark plugs per cylinder, controlled by two DME units.

Emissions Control:

Catalytic converters, Lambda sensors (multiple), EGR.

🔧 Transmission

Standard Transmission:

4-speed Automatic (ZF 4HP22 EH - Electronic Control)

Optional Transmission:

5-speed Manual (Getrag 265/5 - Less Common)

Transmission Fluid Type:

BMW ATF LT3 (or equivalent such as Dexron III/Mercon)

Standard Transmission:

4-speed Automatic (ZF 4HP24 EH - Electronic Control)

Optional Transmission:

None (Exclusively Automatic)

Transmission Fluid Type:

BMW ATF LT3 (or equivalent such as Dexron III/Mercon)

Electronic Control:

Both automatic transmissions feature electronic control for smoother shifting and optimal performance.

Sport Mode:

Available Sport mode for more aggressive shifting points.

📐 Dimensions

Wheelbase:

2,830 mm (111.4 in)

Length:

4,965 mm (195.5 in)

Width:

1,855 mm (73.0 in)

Height:

1,400 mm (55.1 in)

Wheelbase:

3,070 mm (120.9 in)

Length:

5,205 mm (204.9 in)

Width:

1,855 mm (73.0 in)

Height:

1,400 mm (55.1 in)

Wheelbase:

3,070 mm (120.9 in)

Length:

5,205 mm (204.9 in)

Width:

1,855 mm (73.0 in)

Height:

1,400 mm (55.1 in)

Curb Weight 735I:

Approx. 1,720 kg (3,792 lbs)

Curb Weight 735Il:

Approx. 1,780 kg (3,924 lbs)

Curb Weight 750Il:

Approx. 1,970 kg (4,343 lbs)

Wheel Bolt Pattern:

5x120

Typical Wheel Size:

15-inch or 16-inch alloy wheels

Typical Tire Size 735:

205/65R15 or 225/60R15

Typical Tire Size 750:

225/60R15 or 225/55R16

🛡️ Safety Features

NHTSA Ratings:

Specific NHTSA ratings for E32 models from this era are not readily available in a standardized format comparable to modern vehicles.

Airbags:

Driver's side airbag (standard from 1991 onwards).

Seatbelts:

3-point inertia-reel seatbelts for all occupants.

โครงสร้างตัวถัง:

Reinforced passenger cell with crumple zones.

Steering Column:

Collapsible steering column.

ABS:

Anti-lock Braking System (ABS) standard on all models.

Asc:

Automatic Stability Control (ASC) was available, especially on the 750iL, and later as ASC+T with traction control.

Edc:

Electronic Damper Control (EDC) was an optional feature for adaptive suspension tuning.

💡 Technology Features

Audio System:

BMW Bavaria C Business/Professional cassette radio, often with optional CD changer.

Navigation:

Optional early-generation GPS navigation systems were available, though rare and considered primitive by modern standards.

Cruise Control:

Electronic cruise control.

Parking Assistance:

Park distance control (PDC) was an optional feature introduced during the E32's lifecycle.

Communication Systems:

No integrated Bluetooth or mobile phone connectivity in the modern sense. Factory-installed car phones were available as an option.

Climate Control:

Automatic climate control with dual-zone temperature regulation was standard on most models.

Seat Adjustment:

Power adjustable front seats with memory function for the driver's seat were common options.

Bc System:

Onboard computer (BC) providing information on fuel consumption, range, external temperature, and service reminders.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500-10,000 miles or 12-15,000 km, or as indicated by the oil service light.

Major Service Interval:

Significant maintenance items (e.g., spark plugs, coolant) typically around 30,000-60,000 miles.

Transmission Service Interval:

Fluid and filter change recommended every 60,000-80,000 miles, especially for electronic control transmissions.

Engine Oil:

SAE 5W-30 or 5W-40 synthetic oil meeting BMW LL-98 or API SG/SH specifications (consult specific owner's manual for exact recommendation).

Coolant:

BMW Blue or similar ethylene glycol-based coolant with corrosion inhibitors. Mixture of 50/50 with distilled water.

Brake Fluid:

DOT 4 low-viscosity brake fluid.

Power Steering Fluid:

ATF Dexron II/III or specified BMW power steering fluid.

Cooling System:

Degradation of plastic coolant hoses, expansion tank, and water pump failure are common.

Electronics:

Failure of control modules (DME, ABS, EGS), sensor failures (crankshaft position, camshaft position), dashboard pixelation, and wiring harness degradation.

Suspension And Steering:

Wear in bushings, ball joints, and tie rods; occasional leaks from self-leveling rear suspension (if equipped).

Fuel System:

Clogged fuel injectors, failing fuel pumps, and degraded fuel lines.

Exhaust System:

Corrosion and failure of catalytic converters and mufflers.

Ignition System:

Misfires due to coil pack failure, spark plug wire issues, or distributor issues (on earlier M30 variations).

📚 Vehicle History

Bmw Luxury Sedan Legacy:

The E32 represents a continuation of BMW's commitment to producing refined, performance-oriented luxury sedans, building upon the success of the E23 generation.

E32 Introduction:

Introduced in 1986, the E32 marked a significant styling and technological advancement over the E23, with a more aerodynamic design and introduction of electronic systems.

Key Innovations E32:

Introduction of the V12 engine (M70) in the 750iL, longer wheelbase 'iL' variants, increased use of electronics (e.g., ABS, ASC, EDC, early onboard computer).

E32 Facelift:

A minor facelift occurred around 1991/1992, with subtle styling updates and powertrain refinements.

Production Years:

1986–1994

Manufacturing Location:

Dingolfing, Germany

E32 Successors:

Replaced by the E38 generation starting in 1994.

🏆 Awards & Recognition

Car Of The Year:

While the E32 itself may not have won a specific 'Car of the Year' award in its debut year, it consistently received accolades from automotive journalists for its engineering, comfort, and performance.

Class Leading Attributes:

Widely recognized as a benchmark for luxury sedan engineering and driving dynamics in its class during the late 1980s and early 1990s.

Automotive Press Awards:

Frequently featured in 'best of' lists and praised for its V12 engine by publications like Car and Driver, MotorTrend, and Road & Track.