This comprehensive Jeep Grand Cherokee WJ 1990 Repair/ Service Manual is the same manual used by official dealers' workshops. It provides detailed instructions and step-by-step diagrams for all workshop procedures, covering everything from basic maintenance tasks like changing spark plugs to complex repairs involving electrical diagrams, torque settings, and fluid capacities. This manual equips you with all the necessary information to maintain and repair your Jeep Grand Cherokee WJ 1990. Its clear and concise layout makes it easy to navigate and find the specific information you need. The manual covers a wide range of topics, including: * **Introduction:** Get acquainted with the general layout and technical specifications of your vehicle. * **Lubrication and Maintenance:** Learn about proper lubrication schedules, fluid types, and maintenance procedures to keep your Jeep running smoothly. * **Suspension:** Understand the intricacies of your suspension system, including components, adjustments, and troubleshooting tips. * **Differential and Driveline:** Dive into the technical details of your vehicle's differential and driveline systems, including maintenance and repair procedures. * **Brakes:** Learn about brake system components, adjustments, troubleshooting, and repair procedures to ensure safe and effective braking. * **Clutch:** Acquire knowledge about the clutch system, its operation, adjustments, and repair procedures. * **Cooling System:** Gain insight into the cooling system, including its components, maintenance, and repair procedures. * **Battery:** Discover the ins and outs of your battery, including testing, maintenance, and replacement procedures. * **Starting System:** Learn about the starting system, its components, troubleshooting, and repair procedures. * **Charging System:** Understand the charging system, its components, troubleshooting, and repair procedures to ensure proper battery charging. * **Ignition System:** Gain knowledge of the ignition system, its components, troubleshooting, and repair procedures. * **Instrument Panel Systems:** Explore the workings of your instrument panel, including gauges, warning lights, and other displays. * **Audio Systems:** Learn about your vehicle's audio system setup, operation, and troubleshooting. * **Horn Systems:** Understand the operation and troubleshooting of your vehicle's horn system. * **Vehicle Speed Control System:** Gain insight into the cruise control system, its operation, and troubleshooting. * **Turn Signal and Hazard Warning Systems:** Explore the operation and troubleshooting of your turn signal and hazard warning systems. * **Wiper and Washer Systems:** Learn about the operation and troubleshooting of your wiper and washer systems. * **Lamps:** Understand the types of lamps used in your vehicle and their replacement procedures. * **Passive Restraint Systems:** Acquire knowledge about your vehicle's safety features, including airbags and seatbelts. * **Electrically Heated Systems:** Learn about your vehicle's heated systems, including seat heaters and window defrosters. * **Power Distribution Systems:** Understand the distribution of power within your vehicle, including fuses and relays. * **Power Lock Systems:** Explore the operation and troubleshooting of your power door lock system. * **Vehicle Theft/Security Systems:** Learn about your vehicle's anti-theft system and its features. * **Power Window Systems:** Gain insight into the operation and troubleshooting of your power window system. * **Power Mirror Systems:** Understand the operation and troubleshooting of your power mirror system. * **Chime/Buzzer Warning Systems:** Learn about the various warning systems in your vehicle and their functions. * **Overhead Console Systems:** Understand the operation and functions of your overhead console. * **Wiring Diagrams:** Access comprehensive wiring diagrams to assist with electrical troubleshooting and repairs. * **Engine:** Delve into the heart of your vehicle, the engine, learning about its components, maintenance, and repair procedures. * **Exhaust System and Intake Manifold:** Understand the workings of your exhaust system and intake manifold, including troubleshooting and repair procedures. * **Frame and Bumpers:** Gain insight into the structural components of your vehicle, including the frame and bumpers. * **Fuel System 2.5L Diesel Engine:** Learn about the fuel system, including its components, maintenance, and repair procedures. * **Steering:** Understand the operation and maintenance of your steering system, including troubleshooting and repair procedures. * **Transmission and Transfer Case:** Explore the intricacies of your transmission and transfer case, including maintenance and repair procedures. * **Tires and Wheels:** Learn about proper tire care, including maintenance, selection, and replacement. * **Body:** Discover the components and repair procedures related to your vehicle's body, including doors, panels, and windows. * **Heating and Air Conditioning:** Understand the workings of your vehicle's heating and air conditioning system, including maintenance and repair procedures. * **Emission Control Systems:** Learn about your vehicle's emission control system and its components, including maintenance and repair procedures.

The Jeep Grand Cherokee WJ, produced from 1999 to 2004, marked a significant shift in the iconic off-roader's design and engineering. Replacing its predecessor, the ZJ, the WJ brought a more refined and car-like feel while retaining its robust capabilities. The WJ departed from the boxy shape of its predecessors, adopting a sleek, aerodynamic design with rounded edges and a flowing roofline. It was available in both a two-door and a four-door configuration, catering to different needs and preferences. Under the hood, the WJ offered a range of powerful V6 and V8 engines, including the renowned 4.7L PowerTech V8, renowned for its smooth performance and ample torque. Coupled with a sophisticated four-wheel drive system, the WJ retained its off-road prowess, tackling challenging terrains with ease. The 1990 Factory Service Repair Manual for the Jeep Grand Cherokee WJ serves as an indispensable guide for mechanics, technicians, and avid enthusiasts seeking to understand and maintain their vehicles. This comprehensive manual provides detailed information on every aspect of the WJ, from engine and transmission to brakes, suspension, electrical systems, and bodywork. It includes step-by-step instructions, diagrams, and specifications for various repair and maintenance procedures, enabling individuals to diagnose and fix problems effectively. The manual also features troubleshooting guides, component identification charts, and wiring diagrams, providing valuable insights into the WJ's intricate systems. With its wealth of technical data and practical guidance, the 1990 Factory Service Repair Manual empowers owners to maintain their WJ's peak performance and extend its longevity.