🏷️ Basic Information

Make:

Infiniti

Model:

Q45

Year:

1998

Chassis Code:

G50

👋 Introduction

Vehicle Segment:

Full-size luxury sedan

Key Competitors:

Lexus LS 400, BMW 7 Series, Mercedes-Benz S-Class, Cadillac DeVille

Value Proposition:

Provides extensive, licensed OE repair information for DIYers and professionals, offering a more convenient and cost-effective alternative to older printed manuals.

📋 Manual Details

Manual Product Name:

1998 Infiniti Q45 Service & Repair Manual Software

Manual Type:

Digital Service and Repair Manual Software

Format Type:

Online Access (Web Browser)

Access Duration:

1 Year (with option for renewal)

Language:

English

Software Compatibility:

PC, Laptop, Smartphone, Tablet (requires internet connection and web browser)

📖 Manual Coverage

Powertrain:

Engine mechanical, engine management, fuel system, ignition system, exhaust system, drivetrain (front-wheel drive)

Chassis:

Suspension (front and rear), steering system, brakes (front and rear), wheels and tires

Body:

Body panels, interior trim, exterior trim, doors, windows, locks, seat mechanisms

Electrical:

Wiring diagrams, lighting, power distribution, starting and charging system, instrument cluster, audio system, climate control electronics

Climate Control:

HVAC system operation, diagnosis, and repair (including A/C refrigerant)

Maintenance:

Scheduled maintenance, fluid changes (oil, coolant, brake, transmission, power steering), filter replacements, lubrication

Repair:

Engine overhaul, transmission repair, brake caliper/rotor replacement, suspension component replacement, steering rack overhaul, electrical component diagnosis and replacement

Diagnostics:

Troubleshooting guides, diagnostic trouble codes (DTCs) related to engine and powertrain control modules, component testing procedures

Body And Trim Repair:

Procedures for interior and exterior panel removal, installation, and adjustment, including door mechanisms, trim pieces, and bumper covers.

Steering System Repair:

Detailed steps for steering column removal, steering rack diagnosis and repair, power steering pump replacement, and alignment procedures.

Brake System Repair:

Comprehensive guide for brake pad and rotor replacement, caliper service, brake line inspection and replacement, brake bleeding procedures, and ABS component diagnosis.

Depth Level:

Comprehensive OE-derived technical information, suitable for DIYers and professional technicians

Wiring Diagrams:

Inclusion of detailed, system-specific wiring diagrams for accurate electrical troubleshooting.

Torque Specifications:

Precise torque values for critical fasteners across all major components.

Diagnostic Trouble Codes:

Explanation of common DTCs and systematic troubleshooting trees for diagnosing electronic issues.

📊 Manual Specifications

Digital Format Details:

Web-based interactive platform, licensed OE data

Print Availability:

Not a printable manual in the traditional sense, but content can be accessed and viewed on screen.

Binding Style:

N/A (Online Access)

Paper Quality:

N/A (Digital)

⚙️ Engine Specifications

Engine Code:

VQ35DE

Engine Type:

3.5L V6 DOHC 24-Valve

Horsepower:

240 hp @ 6000 rpm

Torque:

246 lb-ft @ 4800 rpm

Fuel Delivery:

Electronic Fuel Injection (EFI)

Engine Oil Type:

API SG or SH, SAE 5W-30 (check manual for specific climate recommendations)

Engine Oil Capacity:

Approx. 4.7 US quarts (4.4 liters) with filter change

Coolant Type:

Nissan Genuine Super Long Life Coolant (Blue) or equivalent silicate-free, ethylene glycol-based coolant

Timing Mechanism:

Timing Chain

🔧 Transmission

Transmission Type:

4-speed Automatic (RE4R01A)

Optional Transmission:

N/A for 1998 model year

Transmission Features:

Electronically controlled, adaptive shift logic

Transmission Fluid Type:

Nissan Genuine Matic D ATF or Dexron III compatible

Transmission Fluid Capacity:

Approx. 9.3 US quarts (8.8 liters) for overhaul fill

📐 Dimensions

Length:

197.4 inches (5014 mm)

Width:

71.7 inches (1821 mm)

Height:

55.5 inches (1410 mm)

Wheelbase:

112.2 inches (2850 mm)

Curb Weight:

Approx. 3,737 lbs (1695 kg)

Gross Vehicle Weight Rating:

Approx. 4,762 lbs (2160 kg)

🛡️ Safety Features

NHTSA Frontal Impact Driver Rating:

Not rated for 1998 model year (pre-dates standardized testing).

ABS:

Standard (Anti-lock Braking System)

Traction Control:

Available (Traction Control System - TCS)

Airbags:

Driver and front passenger airbags

Seatbelts:

3-point front and rear seatbelts, pretensioners for front seats

💡 Technology Features

Audio System:

Bose premium audio system (often with cassette and CD player)

Navigation:

Optional factory navigation system available on some models.

Cruise Control:

Standard cruise control

Keyless Entry:

Available keyless entry system

🔧 Maintenance

Oil Change Interval:

Every 3,750 miles or 3 months (whichever comes first) under normal driving conditions; refer to manual for severe driving conditions.

Engine Air Filter Replacement:

Every 15,000 miles or 12 months

Spark Plug Replacement:

Every 60,000 miles (Iridium-tipped spark plugs)

Transmission Fluid Change:

Every 30,000 miles or 24 months

Brake Fluid Type:

DOT 3

Power Steering Fluid Type:

Nissan Genuine Power Steering Fluid or Dexron III compatible ATF

Common Wear Items:

Age-related degradation of suspension bushings, fuel pump failure, ignition coil failures, ABS sensor issues, catalytic converter failure, window regulator issues.

Common Diagnostics:

P0300 (random misfire), P0171/P0174 (system too lean), ABS warning lights, check engine light related to O2 sensors or EVAP system.

📚 Vehicle History

Infiniti Founding:

Infiniti was launched by Nissan in 1989 as a luxury brand for the North American market.

Q45 Generation 1:

The first generation (G50, 1990-1996) established Infiniti's entry into the luxury sedan market with innovative features like active suspension and rear-wheel steering. The 1998 model year marks the beginning of the second generation (G50 facelift/updated).

Manufacturing Location:

Japan

🏆 Awards & Recognition

Car And Driver 10Best:

While the 1998 model year specifically might not have made the '10Best' list, the Q45 was a strong contender in the luxury segment for its class and contributed to Infiniti's growing reputation for performance and luxury.