📚 Vehicle Manual Information

Jeep Grand Cherokee WG 1999 All Service Repair Manual

🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Year:

1999

Chassis Code:

WG

Market Segment:

Mid-size SUV

👋 Introduction

Vehicle Type:

The Jeep Grand Cherokee WG (ZJ generation in North America, but WG for international markets with specific engine options) was a highly popular mid-size SUV known for its off-road capability, comfortable ride, and luxurious appointments for its time.

Target Audience:

Appealed to families and individuals seeking a capable all-weather and off-road vehicle that could also serve as a comfortable daily driver.

Competitors:

Competed against vehicles like the Ford Explorer, Toyota 4Runner, Chevrolet Blazer/TrailBlazer, Nissan Pathfinder, and Land Rover Discovery.

Off Road Prowess:

Renowned for its Quadra-Trac 4WD systems, robust chassis, and good ground clearance.

Powertrain Options:

Offered a range of powerful V8 and inline-6 engines.

Interior Comfort:

Provided a more upscale and comfortable interior compared to some rivals, with available leather seating and premium features.

📋 Manual Details

Manual Type:

Service and Repair Manual

Language:

English

Format:

Downloadable Digital Format (likely PDF)

Estimated Page Count:

Varies by specific publication, typically 1500+ pages for a comprehensive service manual.

📖 Manual Coverage

Engine Mechanical:

Complete disassembly, inspection, repair, and reassembly of all engine components, including block, heads, pistons, crankshaft, camshafts, valvetrain, seals, gaskets.

Engine Management:

Fuel injection system, ignition system, emissions control system, sensors, actuators, ECU diagnostics and troubleshooting, wiring diagrams.

Transmission Automatic:

All aspects of automatic transmission service, including removal, installation, overhaul, torque converter, valve body, solenoids, electronic controls, fluid specifications, and troubleshooting.

Transmission Manual:

Service and repair procedures for manual transmissions, including clutch, gearbox overhaul, and fluid requirements.

Drivetrain 4X4:

Service and repair of the Quadra-Trac II and/or Command-Trac 4WD systems, transfer case, differentials (front and rear), driveshafts, CV joints, and hub assemblies.

Suspension System:

Front and rear suspension components, springs, shock absorbers, control arms, ball joints, bushings, steering linkage, alignment specifications, and troubleshooting.

Brake System:

Disc brake systems (front and rear), hydraulic components, ABS system, parking brake, brake fluid specifications, bleeding procedures, and wear component replacement.

Steering System:

Power steering system, pump, gearbox, steering column, tie rods, power steering fluid specifications, and troubleshooting.

Electrical System:

12V electrical system, battery, charging system (alternator), starting system (starter motor), lighting, wipers, horn, fuses, relays, and detailed wiring diagrams for all circuits.

Climate Control:

HVAC system, A/C compressor, refrigerant, evaporator, condenser, heater core, blower motor, climate control modules, and troubleshooting.

Body Interior:

Door mechanisms, interior trim panels, seating, airbags, seatbelts, dashboard assembly, and body panel repair.

Body Exterior:

Body panels, bumpers, hood, doors, tailgate, glass, seals, weatherstripping, and exterior trim replacement.

Body Frame:

Frame inspection and repair procedures, body mounting points, and structural components.

Diagnostic Troubleshooting:

Systematic diagnostic procedures for common and uncommon faults, fault codes (DTCs), and troubleshooting trees.

Routine Maintenance:

Oil and filter changes, air filter replacement, spark plug replacement, fluid level checks and top-offs, tire rotation and pressure checks, battery maintenance.

Component Replacement:

Step-by-step guides for replacing virtually all serviceable components, including alternators, starters, water pumps, fuel pumps, radiators, belts, hoses, brake pads, rotors, and more.

Overhaul Rebuild:

Detailed procedures for complete engine and transmission overhauls, including specifications for machining and clearances.

Electrical Diagnostics:

Troubleshooting electrical circuits using multimeters, wiring diagrams, and diagnostic tools. Includes pinpoint testing procedures.

Alignment And Geometry:

Specifications and procedures for wheel alignment (camber, caster, toe), steering alignment, and suspension geometry.

Special Tools:

Identification and usage of specialized tools required for specific repair procedures.

Diagnostic Capabilities:

Advanced diagnostic procedures, including the interpretation of diagnostic trouble codes (DTCs) and the use of scan tools for real-time data analysis.

Repair Complexity:

Covers everything from basic maintenance to full engine and transmission rebuilds, suitable for both amateur and professional mechanics.

Documentation Quality:

Likely includes detailed diagrams, exploded views, torque specifications, and step-by-step instructions derived from factory service information.

📊 Manual Specifications

Digital Format:

Typically PDF, allowing for easy searching, printing, and viewing on various devices.

Searchability:

Searchable text functionality within the PDF document for quick access to specific topics.

Print Quality:

Printable pages, enabling users to print specific sections or the entire manual for hard-copy reference.

Digital Binding:

N/A (Digital format)

Digital Paper Type:

N/A (Digital format)

⚙️ Engine Specifications

Engine Variant 1:

4.0L Inline-6 (242 cu in)

Engine Variant 1 Code:

AMC 242

Engine Variant 1 Hp:

185 hp @ 4700 rpm (approximate)

Engine Variant 1 Torque:

235 lb-ft @ 3000 rpm (approximate)

Engine Variant 2:

4.7L V8 (285 cu in)

Engine Variant 2 Code:

PowerTech V8

Engine Variant 2 Hp:

220-230 hp @ 4500 rpm (approximate)

Engine Variant 2 Torque:

295-300 lb-ft @ 3200 rpm (approximate)

Compression Ratio 4.0L:

8.8:1

Bore X Stroke 4.0L:

3.88 x 3.57 in (98.5 x 90.6 mm)

Compression Ratio 4.7L V8:

9.0:1

Bore X Stroke 4.7L V8:

3.74 x 3.37 in (95.0 x 85.6 mm)

Fuel Delivery 4.0L:

Sequential Electronic Multi-Point Fuel Injection (MPI)

Fuel Delivery 4.7L V8:

Sequential Electronic Multi-Point Fuel Injection (MPI)

Fuel Type:

Unleaded Gasoline

Required Octane:

87 Octane (minimum) for 4.0L, 89 Octane recommended for 4.7L V8.

🔧 Transmission

Transmission Type 4.0L:

4-speed Automatic (42RE)

Transmission Type 4.7L V8:

4-speed Automatic (45RFE/44RE)

Manual Transmission:

No manual transmission option available for the 1999 WG Grand Cherokee.

Transfer Case Options:

Selec-Trac (part-time 4WD), or optional Quadra-Trac II (full-time 4WD).

Automatic Transmission Fluid Type:

ATF+4 (or equivalent specification for Chrysler transmissions)

Transmission Fluid Capacity 42Re:

Approximately 8-10 quarts (dry fill)

Transmission Fluid Capacity 45Rfe:

Approximately 10-12 quarts (dry fill)

📐 Dimensions

Wheelbase:

111.0 inches (2819 mm)

Length:

186.7 inches (4742 mm)

Width:

71.0 inches (1803 mm)

Height:

65.9 inches (1674 mm)

Ground Clearance:

Approx. 8.0-8.4 inches (203-213 mm), depending on tire size and suspension.

Approach Angle:

Approx. 38 degrees

Departure Angle:

Approx. 27 degrees

Breakover Angle:

Approx. 22 degrees

Curb Weight:

Approx. 4,000 - 4,500 lbs (1814 - 2041 kg), depending on engine and equipment.

Gross Vehicle Weight Rating Gvwr:

Approx. 5,700 - 5,900 lbs (2585 - 2676 kg)

Towing Capacity:

Up to 5,000 lbs (2268 kg) with proper towing package and equipment.

Payload Capacity:

Approx. 1,200 - 1,500 lbs (544 - 680 kg)

Wheel Bolt Pattern:

5 x 4.5 inches (5 x 114.3 mm)

Wheel Size:

Standard 16-inch wheels, optional 17-inch wheels.

Tire Size Standard:

P225/75R16

Tire Size Optional:

P235/65R17

🛡️ Safety Features

NHTSA Rollover Rating:

4-star (Front-passenger, driver, and rollover ratings varied by test year and specific configuration. Generally considered a safe vehicle for its era).

IIHS Ratings:

Check IIHS archives for specific crash test results for the 1999 model year. Often rated 'Good' in frontal impacts for its class.

ABS:

Standard Anti-lock Braking System (ABS) on all wheels.

Traction Control:

Optional Traction Control System (TCS) available, especially with V8 models.

Airbags:

Driver and front passenger airbags standard. Side airbags not typically available on this model.

Seatbelts:

Three-point seatbelts with pretensioners for front occupants, three-point seatbelts for rear outboard occupants.

Child Safety Anchors:

LATCH (Lower Anchors and Tethers for Children) system not standard on this model year; typically relies on seatbelt anchoring for child seats.

💡 Technology Features

Audio System:

AM/FM stereo with cassette player and CD player (optional), with 6 speakers standard. Premium Infinity sound systems were available.

Display Screen:

Basic analog gauges and a central information display. No integrated color touchscreens common in modern vehicles.

Cruise Control:

Standard on most trims.

Keyless Entry:

Optional on some trims.

Bluetooth:

Not available on this model year.

Usb Ports:

Not available on this model year.

Remote Start:

Optional accessory.

Memory Seats:

Optional on higher trims.

🔧 Maintenance

Engine Oil Change:

Every 3,000-5,000 miles (4,800-8,000 km) or 6 months, whichever comes first, depending on driving conditions. Severe service may require more frequent changes.

Engine Oil Filter:

Replace with every oil change.

Air Filter Replacement:

Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on inspection.

Spark Plug Replacement 4.0L:

Approximately every 30,000-60,000 miles (48,000-96,000 km), use Champion spark plugs or equivalent.

Spark Plug Replacement 4.7L V8:

Approximately every 30,000-60,000 miles (48,000-96,000 km), use Champion Platinum Power spark plugs or equivalent.

Coolant Flush Replacement:

Every 30,000-60,000 miles (48,000-96,000 km) or 2-4 years. Use Mopar OAT (Organic Additive Technology) coolant or equivalent.

Transmission Fluid Service:

Every 30,000-60,000 miles (48,000-96,000 km). Includes filter replacement.

Brake Fluid Flush:

Every 2-3 years or 30,000 miles (48,000 km).

Differential Fluid Change:

Every 30,000-50,000 miles (48,000-80,000 km) for both front and rear differentials, and transfer case. Use appropriate gear oil (GL-5) and transfer case fluid.

Engine Oil Type 4.0L:

SAE 10W-30 API Certified (check owner's manual for specific viscosity and API service classification).

Engine Oil Type 4.7L V8:

SAE 5W-30 API Certified (check owner's manual for specific viscosity and API service classification).

Engine Oil Capacity 4.0L:

5.0 quarts (4.7 liters) with filter change.

Engine Oil Capacity 4.7L V8:

6.0 quarts (5.7 liters) with filter change.

Power Steering Fluid:

ATF+4 (or Mopar Power Steering Fluid)

Brake Fluid:

DOT 3

Engine Oil Leaks 4.0L:

Common leaks from valve cover gasket, oil pan gasket, and rear main seal, especially as mileage increases.

Cooling System Issues 4.0L:

Cracked cylinder heads on earlier versions of the 4.0L engine were a known issue, though less common by 1999. Water pump and radiator leaks are also common maintenance items.

Transmission Hard Shifts:

Can be caused by worn solenoids, low fluid, or filter issues in the automatic transmission.

4Wd System Issues:

Transfer case actuator or selector switch problems can occur. Leaks from front or rear differentials and axle seals.

Power Window Motors:

Failure of power window motors and regulators is a common electrical issue.

Interior Rattles And Squeaks:

Typical for SUVs of this era, often related to trim panels and body mounts.

📚 Vehicle History

Jeep Legacy:

Jeep has a long-standing reputation for ruggedness and off-road capability, tracing its roots back to World War II military vehicles. This heritage informs the design and engineering of all Jeep vehicles, including the Grand Cherokee.

Grand Cherokee Zj Generation:

The 1999 Grand Cherokee belongs to the second generation (WJ) in North America, which was a significant redesign from the first generation (ZJ). The WG designation often refers to models produced for export markets and might have slight variations in standard equipment or engine options.

Second Generation Wj Introduction:

The WJ generation debuted for the 1999 model year, representing a substantial upgrade in refinement, interior quality, and powertrain options (introducing the 4.7L V8) compared to the outgoing ZJ.

Manufacturing Location:

Primarily manufactured in Detroit, Michigan, USA.

Production Years Wj:

1999-2004