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Lexus

1990 Lexus LS400 Service & Repair Manual Software

1990 Lexus LS400 Service & Repair Manual Software

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Vehicle data plateRef 331347
Brand
Lexus
Vehicle
Car
Models covered
LS400
Years
1990
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

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๐Ÿท๏ธ Basic Information
Identification
Make:
Lexus
Model:
LS400
Year:
1990
Generation
Generation Code:
XF10 (First Generation)
Codes
Chassis Code:
UCF10
๐Ÿ‘‹ Introduction
Market Position
Positioning:
The 1990 Lexus LS400 (UCF10) was a groundbreaking luxury sedan, the first flagship model from Lexus, designed to compete directly with established German luxury marques. It set new standards for refinement, build quality, and quietness in its class.
Competitive Analysis
Competitors:
Primary competitors at launch included the Mercedes-Benz S-Class (W126), BMW 7 Series (E32), and Jaguar XJ.
Key Features
Distinctive Attributes:
Exceptionally quiet and smooth ride, powerful V8 engine, luxurious interior appointments, advanced (for the time) technology, meticulous build quality, reliability.
๐Ÿ“‹ Manual Details
Coverage Areas
Coverage:
Complete Service and Repair
Page Count
Estimated Pages:
1500+
Manual Type
Type:
Factory Service Manual (FSM) - Software
Language
Language:
English
Format
Format:
Software (likely PDF or proprietary viewer)
๐Ÿ“– Manual Coverage
Systems Covered
Engine:
All engine components, diagnostics, repair procedures, timing belt replacement, lubrication system, cooling system, fuel system (EFI), emission control systems.
Transmission:
Automatic Transmission (A340E), torque converter, fluid change procedures, internal component repair, electronic control unit (ECT) diagnostics.
Drivetrain:
Front-wheel drive (FWD) axles, differential, drive shaft, mounts, seals.
Suspension:
Front and rear independent suspension, shock absorbers, springs, control arms, bushings, steering knuckles, alignment specifications.
Brakes:
Front and rear disc brakes, ABS system (Anti-lock Braking System) diagnostics and repair, brake fluid specifications, caliper and rotor replacement, parking brake.
Steering:
Power steering system, steering gear, steering column, tilt and telescopic adjustment, power steering fluid specifications.
Electrical:
12V electrical system, battery, charging system (alternator), starter motor, fuses, relays, wiring diagrams for all circuits, lighting systems, horns, wipers, power accessories.
HVAC:
Heating, Ventilation, and Air Conditioning (HVAC) system, refrigerant types (R12), compressor, condenser, evaporator, blower motor, climate control module diagnostics.
Body:
Body exterior panels, doors, hood, trunk, bumpers, glass replacement, interior trim, body repair techniques, rust prevention.
Interior:
Seating systems, dashboard assembly, instrument cluster, door panels, headliner, sound insulation.
Safety Systems:
ABS system, seat belt operation and repair.
Procedures Included
Maintenance:
Scheduled maintenance intervals, oil changes, filter replacements (oil, air, fuel, cabin), spark plug replacement, fluid checks and top-offs, tire rotation.
Troubleshooting:
Diagnostic charts, symptom-based troubleshooting for engine, transmission, electrical, and HVAC systems, common fault codes.
Repair:
Detailed step-by-step repair procedures for all major mechanical and electrical components, including engine teardown and reassembly, transmission overhaul, brake system overhaul, suspension component replacement.
Diagnostics:
On-Board Diagnostics (OBD-I) system, diagnostic trouble codes (DTCs) and their meaning, diagnostic connector locations, procedures for using diagnostic tools.
Installation:
Procedures for replacing components such as alternators, starters, water pumps, fuel injectors, sensors, actuators, radio units, speakers.
Technical Depth
Depth:
Comprehensive, suitable for professional technicians and advanced DIY enthusiasts. Includes detailed specifications, torque values, diagnostic flowcharts, and exploded views.
๐Ÿ“Š Manual Specifications
File Format
File Type:
Software, likely PDF with searchable text and high-resolution diagrams.
Print Quality
Diagram Resolution:
High-resolution, clear and legible diagrams and illustrations.
Binding Type
Binding:
N/A (Software)
Paper Type
Paper Quality:
N/A (Software)
โš™๏ธ Engine Specifications
Primary Engine
Engine Code:
1UZ-FE
Configuration:
4.0L V8 (3969 cc)
Valve Train:
Dual Overhead Camshafts (DOHC), 32 valves (4 valves per cylinder).
Performance
Horsepower:
250 hp @ 5,400 rpm
Torque:
260 lb-ft @ 4,400 rpm
Fuel System
System:
Electronic Fuel Injection (EFI) with sequential port injection.
Fuel Type:
Unleaded Premium Gasoline (91 octane recommended).
Cooling System
Coolant Type:
Toyota Super Long Life Coolant (SLLC) or equivalent (typically ethylene glycol-based).
Lubrication System
Oil Capacity:
7.2 US quarts (6.8 Liters) with filter change.
Oil Viscosity:
SAE 5W-30 recommended for most climates, consult manual for variations.
Timing Belt
Replacement Interval:
Recommended replacement every 90,000 miles (144,000 km) or 5 years, whichever comes first. Critical component for this interference engine.
๐Ÿ”ง Transmission
Standard
Type:
4-speed Electronically Controlled Automatic Transmission (ECT).
Optional
Transmission Options:
None. Only automatic was offered.
Features
Shift Modes:
Power (PWR) and Economy (ECO) modes selectable by the driver.
Fluid
Fluid Type:
Dexron II (or equivalent compatible fluid). Consult manual for specific part number and specifications.
Fluid Capacity:
Approximately 3.5 US quarts (3.3 Liters) for a drain and fill.
๐Ÿ“ Dimensions
Exterior
Length:
197.2 inches (5009 mm)
Width:
70.5 inches (1791 mm)
Height:
55.1 inches (1400 mm)
Wheelbase:
112.2 inches (2850 mm)
Weights
Curb Weight:
Approximately 3,900 - 4,050 lbs (1769 - 1837 kg) depending on equipment.
๐Ÿ›ก๏ธ Safety Features
Ratings
Ntsa Front Impact:
4-star rating (as per period testing)
Ntsa Side Impact:
Not rated or 3-star rating (as per period testing)
Active Features
ABS:
Standard Anti-lock Braking System (ABS) on all four wheels.
Traction Control:
Not standard on 1990 model, but available on some later trims or options.
Passive Features
Airbags:
Driver's side airbag standard.
Seatbelts:
Three-point seatbelts in all seating positions, pretensioners for front occupants.
๐Ÿ’ก Technology Features
Infotainment
Audio System:
Premium ETR AM/FM stereo with cassette player, typically 7-10 speakers, optional CD player.
Climate Control:
Automatic climate control with digital display and manual override.
Driver Assistance
Cruise Control:
Standard electronically controlled cruise control.
Keyless Entry:
Optional keyless entry system available.
Connectivity
Connectivity Features:
None in the modern sense; primarily focused on internal diagnostics via OBD-I.
๐Ÿ”ง Maintenance
Service Intervals
Oil Change:
Every 5,000 miles (8,000 km) or 6 months, whichever comes first (under normal driving conditions).
Tire Rotation:
Every 5,000 miles (8,000 km) or with oil change.
Engine Air Filter:
Inspect every 15,000 miles (24,000 km), replace as needed (typically every 30,000 miles / 48,000 km).
Cabin Air Filter:
Not equipped with a cabin air filter on initial models.
Fluid Specifications
Coolant:
Toyota Super Long Life Coolant (SLLC) or equivalent (50/50 mix with distilled water). Capacity ~8.7 US quarts (8.2 Liters).
Brake Fluid:
DOT 3 SAE J1703 recommended. Capacity ~2.5 US quarts (2.4 Liters).
Power Steering Fluid:
Dexron II or equivalent. Capacity ~2.2 US quarts (2.1 Liters).
Known Issues
Timing Belt:
Critical to replace on schedule. Failure leads to catastrophic engine damage.
Suspension Components:
Front ball joints and bushings can wear over time, leading to noise and imprecise handling.
Electrical Connectors:
Corrosion on ground points and some connectors can cause intermittent electrical issues.
Starter Motor:
Can sometimes fail prematurely, often due to heat soak or brush wear.
Fuel Pump:
While generally reliable, fuel pumps can eventually wear out.
๐Ÿ“š Vehicle History
Brand Heritage
Lexus Launch:
Lexus was launched by Toyota Motor Corporation in September 1989 as its luxury vehicle division, with the LS400 being its inaugural model.
Model Evolution
Xcf10 Generation:
The first generation LS400 (XF10) was produced from 1989 to 1994. It underwent a minor facelift in 1992 (model year 1993).
Production
Manufacturing Location:
Tahara Plant, Aichi Prefecture, Japan.
๐Ÿ† Awards & Recognition
Recognitions
Car And Driver 10Best:
Named to Car and Driver's Ten Best list for 1990 and 1991.
Motor Trend Car Of The Year:
Competed for MotorTrend Car of the Year, showcasing its strong debut.
Certifications
Lexus Quality Standard:
Represented Lexus's commitment to exceptional build quality and refinement, establishing its reputation in the luxury segment.

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Check the model year and engine before you buy

Manufacturers change procedures, wiring and part numbers between model years and engine options. If your VIN plate shows a year or engine code that is not listed on the data plate above, contact us with the model, year and VIN and we will confirm coverage before you order.

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