Primarily professional technicians, with adequate data for DIY enthusiasts.
Page Count
Estimated Page Count:
Refer to actual product listing for precise count; typical comprehensive service manuals of this era range from 800-1500 pages.
Manual Type
Manual Type:
Repair Service Manual
Language
Language:
English
Format
Format:
PDF Download
📖 Manual Coverage
Systems Covered
Engine Systems:
Engine mechanical (assembly, disassembly, overhaul), fuel system (carburetor/injection, pumps, lines), ignition system, cooling system, lubrication system, emission control systems.
Drivetrain Systems:
Manual transmission, automatic transmission, transfer case (4WD models), clutch, driveshafts, differentials, axles.
Chassis Systems:
Suspension (front and rear independent/solid axle configurations), steering system (power/manual), braking system (disc/drum configurations, hydraulic components, parking brake).
Electrical Systems:
Wiring diagrams, charging system (alternator, battery), starting system (starter motor), lighting system, ignition system, instrumentation, power accessories, body control modules (basic).
Body And Interior:
Body construction, exterior trim, doors, windows, seats, upholstery, HVAC system (heating, ventilation, air conditioning), body panel repair, corrosion prevention.
Carbureted (2.3L) or Electronic Fuel Injection (EFI) (2.6L).
Fuel System Diesel:
Indirect Injection (IDI) with rotary or inline fuel injection pumps.
Engine Management
Ignition Type:
Distributor-based ignition system with electronic control (on EFI models).
Cooling System
Cooling Type:
Pressurized liquid cooling system with engine-driven fan or clutch fan.
Lubrication System
Oil Capacity Gasoline:
Approx. 4.5-5.5 quarts (4.3-5.2 liters) with filter, check manual for exact specification.
Oil Capacity Diesel:
Approx. 6-7 quarts (5.7-6.6 liters) with filter, check manual for exact specification.
🔧 Transmission
Standard Transmission
Standard Transmission Type:
5-speed manual transmission.
Optional Transmission
Optional Transmission Type:
3-speed or 4-speed automatic transmission (market dependent).
Drivetrain Configurations
Drivetrain Options:
Rear-wheel drive (RWD) and Four-wheel drive (4WD) with manual or automatic locking front hubs.
Transfer Case
Transfer Case Type 4Wd:
Manual engagement transfer case with 2H, 4H, and 4L (Low Range) settings.
Clutch System
Clutch Type:
Dry single-plate clutch (manual transmission).
Transmission Fluid Manual
Manual Transmission Fluid Spec:
API GL-4 SAE 75W-90 or SAE 80W-90 gear oil. Check manual for exact grade.
Transmission Fluid Automatic
Automatic Transmission Fluid Spec:
Dexron II or equivalent (DEXRON III may be backwards compatible but consult manual).
📐 Dimensions
Exterior Dimensions
Wheelbase Short Bed:
Approx. 104.3 inches (2649 mm).
Wheelbase Long Bed:
Approx. 118.1 inches (3000 mm).
Overall Length:
Varies by bed length and cab configuration (e.g., 178-200 inches).
Cargo Dimensions
Bed Length Short:
Approx. 6 feet (72 inches).
Bed Length Long:
Approx. 7 feet (84 inches).
Weights
Curb Weight:
Approx. 2700-3500 lbs (1225-1588 kg) depending on configuration.
Payload Capacity:
Approx. 1000-1600 lbs (454-726 kg) depending on configuration.
Towing Capacity:
Approx. 3500-5000 lbs (1588-2268 kg) depending on engine and configuration. Consult owner's manual for specific ratings.
🛡️ Safety Features
Ratings
NHTSA Ratings 1989:
Specific NHTSA crash test data for this model year may be limited or unavailable; typically focused on frontal impact. Refer to official NHTSA archives if available.
Active Features
Active Safety Features:
Rear-wheel anti-lock braking system (RWAL) available on some models/trims.
Passive Features
Passive Safety Features:
Seat belts (three-point in front, lap in rear), reinforced cabin structure, padded dashboard and steering wheel.
💡 Technology Features
Infotainment
Infotainment System 1989:
Basic AM/FM radio with cassette player; optional premium sound system. Analog instrumentation.
Driver Assistance
Driver Assistance Features 1989:
Limited to basic active safety features like RWAL. No electronic stability control, traction control, or advanced driver-assistance systems (ADAS).
Connectivity
Connectivity Options 1989:
None in the modern sense. Basic electrical system powers accessories.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 3,000-5,000 miles (5,000-8,000 km) or 3-6 months, depending on driving conditions and oil type used. Refer to manual for specific recommendation.
Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on driving environment. Check manual.
Spark Plug Replacement Gasoline:
Every 30,000-60,000 miles (48,000-96,000 km), depending on spark plug type. Refer to manual for specific plug numbers and gap.
Timing Belt Replacement:
Check manual; many Isuzu engines of this era used timing chains, but some gasoline models might use belts. If belt, typically 60,000-90,000 miles (96,000-145,000 km).
Fluid Specifications
Engine Oil Spec:
API SG or SF classification, viscosity grades typically 10W-30 or 10W-40 for gasoline engines; 15W-40 or 10W-30 for diesel engines. Consult manual for precise recommendation.
Coolant Spec:
Ethylene glycol based coolant (green), typically a 50/50 mix with distilled water. Ensure protection down to -34°F (-37°C). Check manual for specific type and capacity.
Brake Fluid Spec:
DOT 3 or DOT 4. Use fresh fluid from a sealed container.
Known Issues
Common Issues Gasoline:
Carburetor performance degradation, vacuum leaks, ignition coil failure, exhaust manifold cracks, rust on body panels, rear main seal leaks.
Common Issues Diesel:
Glow plug issues, injector pump calibration, turbocharger wear (on turbo models), head gasket failures, starter motor fatigue, potential for injector line leaks.
Isuzu Motors Ltd. is a Japanese commercial vehicle and diesel engine manufacturer with a long history of producing reliable utility vehicles and engines.
Model Evolution
Isuzu Pickup Generations:
The 1989 model falls within the second generation (1985-1995) of Isuzu pickups, known for significant improvements in styling, comfort, and powertrain options over the first generation.
Production Locations
Production Locations:
Primarily produced in Japan by Isuzu and often rebadged and sold in various markets (e.g., Chevrolet LUV in earlier years, Holden Colorado in Australia).
🏆 Awards & Recognition
Recognitions
Industry Awards:
While specific 'awards' for this exact model year might be difficult to pinpoint, Isuzu pickups consistently received recognition for their durability and value in the compact truck segment during the late 80s and early 90s.