🏷️ Basic Information

Make:

Isuzu

Model:

Trooper II

Generation:

Second Generation (UBS Series)

Chassis Code:

UBS

👋 Introduction

Market Position:

The Isuzu Trooper II was positioned as a robust, capable off-road SUV with versatile utility, appealing to both adventure seekers and families needing practical transportation. It competed with vehicles like the Toyota 4Runner, Nissan Pathfinder, and Mitsubishi Montero.

Competitive Analysis:

The Trooper II distinguished itself with its reliable Japanese engineering, strong chassis construction, and often powerful engine options. Its availability with both petrol and diesel engines provided a key differentiator in many markets. This manual addresses the diverse mechanical and electrical configurations found across these models.

Key Features:

Body-on-frame construction for durability, available 4x4 drivetrain for off-road capability, spacious interior, and a range of engine options catering to different performance and economy needs.

📋 Manual Details

Model Years Covered:

1986, 1987, 1988, 1989, 1990, 1991, 1992

Engine Variants Covered:

Petrol (Gasoline) and Diesel

Trim Levels Covered:

All Trim Levels

Transmission Types Covered:

All Transmission Types (Manual and Automatic)

Page Count:

Not specified, but described as 'complete' covering all procedures A-Z.

Manual Type:

Complete Workshop Service Repair Manual

Language:

English

Format:

Downloadable Digital Format (PDF compatible)

📖 Manual Coverage

Engine Mechanical:

Engine assembly, cylinder head, block, crankshaft, pistons, connecting rods, lubrication system, cooling system, fuel injection system (petrol), diesel injection system (diesel), turbocharger (if applicable).

Engine Electrical:

Ignition system, starting system, charging system, engine control unit (ECU), sensors, actuators, wiring diagrams.

Transmission:

Manual transmission overhaul, automatic transmission overhaul, clutch system, transfer case, driveshafts, differentials.

Brakes:

Brake system diagnostics, hydraulic system, ABS (if equipped), brake pad and rotor replacement, caliper overhaul, brake fluid.

Suspension Steering:

Front and rear suspension components, shock absorbers, springs, ball joints, bushings, power steering system, steering gearbox, alignment specifications.

Electrical Systems:

Lighting system, instrument cluster, power windows, power locks, wipers, horn, HVAC controls, battery, fuses, relays, wiring schematics.

Body Interior:

Body panel repair, door mechanisms, interior trim, seats, dashboard, rust prevention and repair, glass replacement.

HVAC:

Air conditioning system, heating system, ventilation, refrigerant charging, component replacement.

Fuel System Petrol:

Fuel tank, fuel pump, fuel lines, fuel filter, fuel injectors, fuel pressure regulator, throttle body, idle air control valve.

Fuel System Diesel:

Fuel tank, fuel lines, fuel filter, injection pump, injectors, glow plug system, fuel shut-off solenoid.

Maintenance:

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

Diagnostics Troubleshooting:

Step-by-step diagnostic procedures for common and uncommon issues, fault code interpretation (if applicable), symptom-based troubleshooting guides.

Repair Rebuild:

Complete overhaul procedures for major components such as engines, transmissions, differentials, brake systems, and steering systems.

Installation Replacement:

Instructions for replacing wear items like brake pads, clutch components, suspension bushings, as well as major component installation.

Technical Data Specifications:

Torque specifications for all fasteners, diagnostic trouble codes (DTCs), electrical component resistance values, engine timing specifications, valve clearances.

Engine Timing:

Procedures for setting ignition timing (petrol) and injection pump timing (diesel), including belt/chain replacement if applicable.

Wheel Alignment:

Specifications and procedures for front and rear wheel alignment, including camber, caster, and toe settings.

Wheel Balancing Tire Mounting:

Information on proper wheel balancing and tire mounting procedures.

Chassis Lubrication:

Grease points and lubrication schedule for chassis components.

Body Repair Techniques:

Guidelines for repairing dents, rust, and replacing body panels, doors, and glass.

Technical Depth:

Comprehensive from basic routine maintenance to complete engine and transmission rebuilds, including electrical system diagnostics and bodywork repair.

Diagnostic Tools Required:

While advanced diagnostic tools for this era were less common, the manual would outline required tools like multimeters, pressure gauges, and timing lights for effective diagnostics.

Wiring Diagrams Detail:

Detailed electrical wiring diagrams for all major systems, including color coding and component locations, essential for electrical troubleshooting.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High-quality, printable pages. Ability to print individual pages or chapters.

Binding Type:

Digital - no physical binding. User can print and bind as desired.

Paper Type:

Digital - no physical paper. Compatible with standard digital viewing and printing devices.

⚙️ Engine Specifications

Engine Code Petrol Examples:

4ZE1 (2.6L), 6VE1 (3.2L V6 - later models)

Engine Code Diesel Examples:

4JB1-T (2.8L Turbo Diesel), 4JG2 (3.1L Turbo Diesel)

Horsepower 2 6L Petrol:

Approximately 110-120 hp (varies by market and exact configuration)

Torque 2 6L Petrol:

Approximately 145-155 lb-ft (varies by market and exact configuration)

Horsepower 2 8L Diesel:

Approximately 90-100 hp (varies by market and exact configuration)

Torque 2 8L Diesel:

Approximately 150-170 lb-ft (varies by market and exact configuration)

Fuel System Petrol:

Fuel injection (multi-point or throttle body injection depending on year/market)

Fuel System Diesel:

Indirect injection, typically with rotary or inline injection pumps (e.g., Bosch VE)

Cooling System Type:

Pressurized liquid cooling system with radiator and fan.

Engine Block Material:

Typically cast iron for both petrol and diesel engines.

Cylinder Head Material:

Typically aluminum alloy for petrol engines, cast iron for diesel engines.

Valvetrain Description:

Overhead valves (OHV) or Overhead Cam (OHC) depending on specific engine. Includes timing belts or chains, camshafts, lifters, valves, and springs. Specific clearances and replacement procedures covered.

🔧 Transmission

Standard Transmission Type:

5-speed manual transmission

Optional Transmission Type:

4-speed automatic transmission

Transfer Case Type:

Part-time 4WD with manual or automatic front hub locking (depending on model year and specification).

Gear Ratios:

Specific gear ratios for manual and automatic transmissions, as well as transfer case low-range ratios, are detailed within the manual.

📐 Dimensions

Wheelbase Short Wheelbase:

Approx. 2,350 mm (92.5 inches) for SWB models.

Wheelbase Long Wheelbase:

Approx. 2,760 mm (108.7 inches) for LWB models.

Curb Weight:

Varies significantly by configuration, typically ranging from 1,700 kg to 2,000+ kg (3,750 lbs to 4,400+ lbs).

Gross Vehicle Weight Rating:

GVWR specifications are detailed in the manual and vary by model and market.

🛡️ Safety Features

Safety Ratings:

Safety ratings from this era (1980s-early 1990s) are less standardized than modern ratings. The manual will cover safety systems relevant to the period.

Active Safety Features:

Four-wheel drive system, reliable braking system. ABS was optional on some later models.

Passive Safety Features:

Seat belts, reinforced body structure, potentially crumple zones designed for the era.

💡 Technology Features

Infotainment Systems:

Basic AM/FM radio with cassette player. Optional premium sound systems were available. Touchscreen or navigation systems were not standard for this era.

Driver Assistance Features:

Limited by the era. Key features would be the 4WD system for traction. ABS was an optional feature on some later models.

Connectivity Features:

No modern connectivity features like Bluetooth, USB, or smartphone integration were available. Auxiliary input for external devices may be present on some later audio units.

🔧 Maintenance

Engine Oil Change Interval:

Typically every 5,000-7,500 km (3,000-5,000 miles) or 6 months, whichever comes first, depending on driving conditions. Consult manual for specific recommendations.

Oil Filter Replacement Interval:

Replace with every oil change.

Air Filter Replacement Interval:

Typically every 20,000-30,000 km (12,000-18,000 miles) or as needed based on inspection.

Transmission Fluid Change Interval Manual:

Refer to manual, typically around 50,000-100,000 km (30,000-60,000 miles).

Transmission Fluid Change Interval Automatic:

Refer to manual, typically around 40,000-80,000 km (25,000-50,000 miles) with filter replacement.

Power Steering Fluid Spec:

Specific power steering fluid type, generally ATF Dexron II or a compatible fluid (verify in manual).

Transfer Case Fluid Spec:

API GL-4 or GL-5 gear oil, typically SAE 75W-90 or 80W-90 (verify in manual).

Differential Fluid Spec:

API GL-5 gear oil, typically SAE 80W-90 or 85W-140 (verify in manual, specify for limited-slip if applicable).

Engine Oil Spec Petrol Example:

API SG or higher, SAE 10W-30 or 10W-40 recommended for most conditions.

Engine Oil Spec Diesel Example:

API CF or higher, SAE 15W-40 recommended for most conditions.

Coolant Spec:

Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. Consult manual for specific type.

Brake Fluid Spec:

DOT 3 or DOT 4 brake fluid (verify in manual).

Transmission Fluid Spec Automatic:

Dexron II or equivalent (verify in manual).

Known Issues Engine:

Head gasket leaks (especially on petrol engines), timing belt wear (if applicable, though many used chains), diesel injector pump issues, turbocharger wear on diesel models.

Known Issues Drivetrain:

Transfer case chain stretch or wear, differential seal leaks, manual transmission synchro wear.

Known Issues Suspension:

Worn ball joints, control arm bushings, and tie rod ends are common wear items, especially on higher-mileage vehicles. Leaf spring fatigue on rear suspension.

Known Issues Electrical:

Corrosion on electrical connectors, issues with power window regulators, aging wiring harnesses.

📚 Vehicle History

Brand Heritage:

Isuzu has a long history in vehicle manufacturing, particularly known for its robust trucks, commercial vehicles, and reliable diesel engines. This heritage contributed to the Trooper's reputation for durability.

Model Evolution:

The Trooper II (UBS) succeeded the first-generation Trooper (ISP). It featured a more modern body style, improved interior amenities, and wider availability of engine and drivetrain options, solidifying its position in the global SUV market.

Production Period:

1986-1992 for the specific generation covered by this manual. Global production varied by market.

Manufacturing Locations:

Primarily Japan, but also assembled in various international markets under license or through partnerships.

🏆 Awards & Recognition

Recognitions And Ratings:

While specific 'awards' are not prominently documented for the Trooper II as a singular model in the same way as modern vehicles, it consistently received praise for its off-road prowess, durability, and value in automotive reviews of its time. It was a strong contender in the burgeoning SUV market.