Positioning:
The 1998 Jeep Grand Cherokee ZJ represented a mature iteration of Jeep's successful luxury SUV, offering a blend of capability and comfort that appealed to a broad audience. This manual serves enthusiasts and professional mechanics alike.
Competitors:
Competed with models like the Ford Explorer, Chevrolet Blazer, Toyota 4Runner, and Land Rover Discovery. The ZJ's unibody construction and sophisticated interior often set it apart.
Vehicle Features:
Available with robust V8 engines, advanced four-wheel-drive systems (Selec-Trac, Quadra-Trac), luxurious interiors, and a refined ride for its class.
Engine Systems:
Engine mechanical, fuel system, ignition system, cooling system, exhaust system, emissions control
Transmission Systems:
Automatic transmission (42RE, 44RE, 46RE), transfer case (NV242, NV249), driveline components
Suspension Steering:
Front and rear suspension, steering gear, power steering system, wheel alignment
Brake Systems:
Front and rear brakes (disc/drum configurations), anti-lock braking system (ABS), parking brake
Electrical Systems:
Battery, charging system, starting system, lighting system, instrument cluster, body electrical, power accessories, wiring diagrams
HVAC System:
Heating, ventilation, and air conditioning (HVAC) system diagnosis and repair
Body Chassis:
Body panels, interior trim, exterior trim, chassis components, frame, doors, windows, seats
Maintenance Procedures:
Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, tune-ups
Repair Procedures:
Component removal, installation, overhaul, and adjustment for all major systems
Troubleshooting:
Diagnostic procedures, fault code interpretation, step-by-step troubleshooting guides for common and complex issues
Diagnostics:
On-Board Diagnostics (OBD-II) system, diagnostic trouble codes (DTCs), scan tool usage, sensor testing
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds, including electrical schematics and torque specifications.
Standard Transmission:
4-speed automatic (42RE with 4.0L I6, 44RE with 5.2L V8, 46RE with 5.9L V8)
Optional Transmission:
N/A for 1998 model year
Transfer Case Options:
NV242 Selec-Trac (part-time and full-time 4WD), NV249 Quadra-Trac (full-time 4WD with viscous coupling)
Automatic Transmission Fluid:
ATF+4 (Chrysler Mopar Material Standard MS-9224) is recommended for later models, but ATF+3 (MS-9222) was common. Manual specifies correct fluid type.
Audio System Options:
Factory premium audio systems with cassette, CD player (optional), and multiple speakers. Various aftermarket head units can be installed.
Cruise Control:
Standard on most trims
Connectivity Features:
Limited by era; typically includes power windows, power locks, power seats (optional).
Oil Change Interval:
Every 3,000-7,500 miles (5,000-12,000 km) or 6 months, depending on driving conditions and oil type used (refer to manual for specifics).
Transmission Fluid Change:
Every 30,000-60,000 miles (48,000-97,000 km) or 2-3 years. Crucial for longevity.
Coolant Change:
Every 30,000 miles (48,000 km) or 2 years.
Spark Plug Replacement:
Approximately 100,000 miles (160,000 km) for platinum-tipped plugs (refer to manual for exact type and interval).
Engine Oil Spec:
API certified SAE 10W-30 for 4.0L I6, SAE 5W-30 or 10W-30 for V8 engines. Consult manual for specific viscosity based on climate.
Coolant Type:
Ethylene glycol based coolant, typically Mopar Antifreeze/Coolant (MS-7170).
Common Problem 1:
Head gasket leaks (especially on 4.0L I6, though less common on later ZJs).
Common Problem 2:
Cooling system issues (radiator, water pump, hoses).
Common Problem 3:
Transmission problems (leaks, solenoids, torque converter issues with higher mileage).
Common Problem 4:
Electrical gremlins (window motors, door locks, interior lights).
Common Problem 5:
Rust, particularly on rocker panels, rear quarter panels, and frame rails in rust-belt regions.
Jeep Legacy:
Jeep has a rich history of producing rugged, off-road capable vehicles dating back to World War II, synonymous with adventure and capability.
Zj Generation Timeline:
The ZJ generation was introduced for the 1993 model year and ran through 1998, evolving to offer more luxury, improved powertrains, and enhanced comfort, bridging the gap between traditional Jeep utility and modern SUV refinement.
Manufacturing Location:
Detroit, Michigan, USA
Production Years:
1993-1998
