Jeep Grand Cherokee WJ 1991 Digital Service Repair Manual

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🏷️ Basic Information Identification Make: Jeep Model: Grand Cherokee Generation: WJ Year: 1991 👋 Introduction Market Position Market Position: The Jeep Grand Cherokee WJ (1991) was a pivotal model, marking...

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标签: 1991 Car Cars Grand Cherokee Grand Cherokee WJ Jeep

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Description

🏷️ Basic Information

Identification

Make:

Model:

Grand Cherokee

Generation:

Year:

👋 Introduction

Market Position

Market Position:

The Jeep Grand Cherokee WJ (1991) was a pivotal model, marking a significant step in the evolution of the premium mid-size SUV, offering a blend of capability and comfort.

Competitive Analysis

Competitive Analysis:

Competed against vehicles like the Ford Explorer, Chevrolet Blazer, and Toyota 4Runner, aiming to provide superior off-road capability with improved on-road manners compared to its predecessors.

Key Features

Key Features:

Known for its robust 4.0L inline-six engine, available V8 options, and the Quadra-Coil suspension system offering a more refined ride. The WJ generation also saw enhancements in interior comfort and feature availability.

📋 Manual Details

Coverage Areas

Coverage Areas:

• Introduction

• Lubrication and Maintenance

• Suspension

• Differential and Driveline

• Brakes

• Clutch

• Cooling System

• Battery

• Starting System

• Charging System

• Ignition System

• Instrument Panel Systems

• Audio Systems

• Horn Systems

• Vehicle Speed Control System

• Turn Signal and Hazard Warning Systems

• Wiper and Washer Systems

• Lamps

• Passive Restraint Systems

• Electrically Heated Systems

• Power Distribution Systems

• Power Lock Systems

• Vehicle Theft/Security Systems

• Power Window Systems

• Power Mirror Systems

• Chime/Buzzer Warning Systems

• Overhead Console Systems

• Wiring Diagrams

• Engine

• Exhaust System and Intake Manifold

• Frame and Bumpers

• Fuel System (2.5L Diesel Engine)

• Steering

• Transmission and Transfer Case

• Tires and Wheels

• Body

• Heating and Air Conditioning

• Emission Control Systems

Page Count

Page Count:

Not specified, but implied to be comprehensive.

Manual Type

Manual Type:

Digital Service and Repair Manual

Language

Language:

English

Format

Format:

📖 Manual Coverage

Systems Covered

Systems Covered:

Comprehensive coverage of all major mechanical, electrical, and body systems, including engine, transmission, drivetrain, suspension, brakes, fuel, cooling, starting, charging, ignition, HVAC, audio, power accessories, security, and emission control systems.

Procedures Included

Procedures Included:

• Maintenance

• Repair

• Troubleshooting

• Diagnostics

• Component Replacement

• Adjustment procedures

• Fluid level checks and changes

• Component disassembly and reassembly

Technical Depth

Technical Depth:

Detailed technical information for both routine maintenance and complex repairs, including diagnostic procedures and specifications.

📊 Manual Specifications

File Format

File Format:

Searchable:

Likely searchable within PDF reader.

Zoom Capability:

Compression:

ZIP (no extractor needed for initial decompression, but likely needed for PDF reader on some devices).

Compatibility:

Windows & Mac (all versions), Smartphones, Tablets.

Print Quality

Print Quality:

Digital, quality dependent on PDF rendering and printing capabilities.

Binding Type

Binding Type:

N/A (Digital Format)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Primary Engine:

4.0L (242 cu in) Inline 6-cylinder (MPI)

Engine Code Primary:

Horsepower Primary:

Approx. 190 hp @ 4450 RPM

Torque Primary:

Approx. 225 lb-ft @ 3200 RPM

Optional Engine

Optional Engine:

4.7L (287 cu in) V8 (High Output)

Engine Code Optional:

AFA, BFA

Horsepower Optional:

Approx. 220-235 hp @ 4800 RPM

Torque Optional:

Approx. 290-300 lb-ft @ 3200 RPM

Diesel Engine

Diesel Engine:

2.5L (150 cu in) Inline 4-cylinder Turbo Diesel

Engine Code Diesel:

Horsepower Diesel:

Approx. 116 hp @ 4200 RPM

Torque Diesel:

Approx. 200 lb-ft @ 2000 RPM

Fuel System

Fuel System:

Multi-point Fuel Injection (MPI) for gasoline engines, Direct Injection for diesel.

Fuel Type

Fuel Type:

Unleaded Gasoline (87 Octane minimum), Diesel Fuel

🔧 Transmission

Standard

Standard Transmission:

4-speed Automatic (42RE/44RE)

Optional

Optional Transmission:

4-speed Automatic (45RFE) for 4.7L V8 models.

Manual Availability

Manual Transmission Availability:

Not available on WJ Grand Cherokee models; exclusively automatic transmissions.

Transfer Case

Transfer Case Options:

• Selec-Trac NV242 (full-time 2-speed, with 2WD/4WD Full-Time Auto mode)

• Quadra-Trac II NV247 (full-time 2-speed, electronically controlled)

📐 Dimensions

Exterior

Wheelbase:

109.0 inches (2769 mm)

Length:

184.5 inches (4686 mm)

Width:

72.4 inches (1839 mm)

Height:

66.7 inches (1694 mm)

Weights

Curb Weight:

Approx. 4,200 - 4,500 lbs (1905 - 2041 kg) depending on configuration.

Towing Capacity:

Up to 5,000 lbs (2268 kg)

🛡️ Safety Features

Ratings

NHTSA Rollover Resistance:

4/5-star rating (varies slightly by configuration).

Active Features

Active Safety Features:

• Four-wheel Anti-lock Braking System (ABS)

• Available Traction Control

Passive Features

Passive Safety Features:

• Dual front airbags

• Side impact protection beams

• Three-point seat belts with pretensioners

• Occupant classification system (for passenger airbag)

💡 Technology Features

Infotainment

Infotainment Options:

Available premium sound systems, CD players, and optional navigation systems (later models).

Driver Assistance

Driver Assistance Features:

Limited by modern standards; primarily focused on ABS and traction control. No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane keeping assist.

Connectivity

Connectivity Features:

Early integration of power accessories; no Bluetooth or USB connectivity typically found in this era.

Instrument Panel

Instrument Panel Features:

Standard analog gauges, warning lights, trip computer on some trims.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,000-7,500 miles (5,000-12,000 km) or 6-12 months, depending on driving conditions and oil type. Consult manual for specific recommendations.

Tire Rotation Interval:

Every 5,000-7,500 miles (8,000-12,000 km).

Transmission Fluid Change Interval:

Every 30,000-60,000 miles (48,000-96,000 km), or more frequently for severe service.

Fluid Specifications

Engine Oil Specification:

SAE 5W-30 (API Certified) for 4.0L and 4.7L engines. Refer to manual for specific viscosity and API service classification for diesel.

Coolant Specification:

Chrysler HOAT (Hybrid Organic Additive Technology) coolant, 50/50 mixture with distilled water. Mopar OAT or equivalent.

Transmission Fluid Specification:

ATF+4 (Automatic Transmission Fluid +4) for 42RE, 44RE, and 45RFE transmissions.

Transfer Case Fluid Specification:

Mercon V (for NV242) or Mopar ATF+4 (for NV247).

Differentials Fluid Specification:

SAE 75W-90 GL-5 Gear Oil for both front and rear differentials. Limited-slip additive may be required for Trac-Lok equipped differentials.

Known Issues

Known Issues:

• Head gasket leaks (particularly on 4.7L V8)

• Cracked cylinder heads (on 4.7L V8)

• Water pump leaks

• Transmission issues (e.g., solenoid pack failure)

• Front axle universal joint (U-joint) wear

• Heater control valve failure

• Interior trim piece degradation

• Radiator core support cracking

📚 Vehicle History

Brand Heritage

Brand Heritage:

Jeep has a long-standing reputation for off-road capability and ruggedness, originating from its military roots in WWII.

Model Evolution

Model Evolution:

The Grand Cherokee nameplate was introduced in 1993 as a more luxurious and refined SUV compared to the Cherokee XJ. The WJ generation, launched in 1999 (for the 2000 model year), represented a significant redesign with improved aerodynamics, a larger interior, and new powertrain options. The product information referencing 1991 for the WJ generation appears to be an error in the product description, as the WJ generation did not debut until the 2000 model year.

Production

Production Years Wj:

1999-2004 (for model years 2000-2004)

Production Location

Production Location:

Jefferson North Assembly Plant in Detroit, Michigan, USA

🏆 Awards & Recognition

Recognitions

Recognitions:

The Grand Cherokee line has historically received praise for its off-road capability and comfortable ride, often appearing on 'best of' lists for SUVs in its class during its production run.

Ratings

Ratings:

Consumer satisfaction ratings varied by model year and specific issues, with some years being more problematic than others.