🏷️ Basic Information

Make:

Isuzu

Model:

I-350 Pickup Truck

Year:

2005

Generation:

First Generation (North America)

Platform Code:

GMT355 (GM Colorado/Canyon platform)

👋 Introduction

Market Position:

Mid-size pickup truck, positioned as a practical and durable workhorse, often competing with domestic rivals like the Ford Ranger and Chevrolet Colorado/GMC Canyon, as well as Japanese offerings like the Toyota Tacoma. The I-350 leveraged GM's GMT355 platform.

Competitive Analysis:

The Isuzu I-350 (and its successor, the I-370) represented Isuzu's re-entry into the North American pickup market following the discontinuation of the Hombre. It aimed to offer a blend of Isuzu's reputation for diesel engines (though this model was gasoline-powered) and GM's manufacturing capabilities, providing a value proposition in the mid-size segment.

Key Features:

Available in regular and crew cab configurations, offered with a powerful inline-five cylinder engine, rear-wheel drive or optional four-wheel drive, and a focus on utility and towing capability. The manual provides in-depth coverage for all these configurations.

📋 Manual Details

Coverage Areas:

All repairs, servicing, and troubleshooting procedures

Page Count:

Hundreds of pages (estimated 1000+ based on typical factory service manuals for this era)

Manual Type:

Factory Service Repair Workshop Manual

Manual Type Clarification:

This is a professional-grade service manual, distinct from a simpler owner's manual. It provides the technical depth necessary for technicians to perform complex diagnostics and repairs, including in-depth troubleshooting trees and component-level repair instructions.

Language:

English

Format:

Downloadable PDF

📖 Manual Coverage

Systems Covered:

Engine Mechanical, Engine Performance, Fuel System, Emission Control, Cooling System, Lubrication System, Ignition System, Starting System, Charging System, Clutch, Manual Transmission, Automatic Transmission, Transfer Case, Drive Shafts, Axles, Wheels, Tires, Suspension (Front and Rear), Steering System, Brake System (Front and Rear), ABS, Body Control Modules, Chassis Electrical, Lighting, Instrumentation, Audio System, HVAC (Heating, Ventilation, and Air Conditioning), Interior Trim, Exterior Trim, Power Accessories (Windows, Locks, Mirrors), Safety Systems (Airbags), Powertrain Control Module (PCM) Diagnostics, Body Control Module (BCM) Diagnostics, CAN Bus Communication

Systems Covered More Detail:

Includes detailed sections on Engine Control Module (ECM) calibration, diagnostic trouble codes (DTCs) and their resolution, oxygen sensor operation, catalytic converter function, fuel pressure testing, injector flow rates, ignition coil testing, power steering system service, all brake component diagnostics (including master cylinder, brake booster, calipers, rotors, and wheel speed sensors), suspension geometry and alignment specifications, chassis lubrication points, and body panel removal/installation procedures.

Procedures Included:

Routine Maintenance, Scheduled Servicing, Diagnostic Troubleshooting (Component Testing, DTC Interpretation), Repair Procedures (Disassembly, Reassembly, Component Replacement), Overhaul Procedures, Electrical System Diagnostics, Wiring Diagrams, Component Location Charts, Technical Specifications, Torque Specifications, Alignment Procedures, Fluid Capacities and Specifications, Lubricant Recommendations, Special Tool Requirements

Procedures Included More Detail:

Detailed instructions for component testing using multimeter, oscilloscope, and scan tools. Includes procedures for recalibrating sensors after replacement, bleeding hydraulic systems (brakes, clutch), diagnosing fuel system pressure issues, checking mass airflow sensor (MAF) and manifold absolute pressure (MAP) sensor data, and performing evaporative emission system (EVAP) leak testing.

Technical Depth:

Comprehensive (from basic fluid changes and inspections to complete engine and transmission rebuilds, advanced electrical diagnostics, and chassis repairs)

📊 Manual Specifications

File Format:

Portable Document Format (PDF)

File Searchability:

Typically searchable PDF text, allowing for quick navigation to specific topics and components.

Print Quality:

High-resolution, suitable for clear printing of text and diagrams

Binding Type:

N/A (Digital Download)

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine:

3.5L DOHC 20-valve V6 (Isuzu V6 engine)

Engine Code:

4G35

Horsepower:

220 hp @ 5500 rpm

Torque:

225 lb-ft @ 4000 rpm

Fuel System:

Electronic Fuel Injection (EFI), Multi-port Fuel Injection (MPFI)

Displacement:

3471 cc (3.5 Liters)

Bore X Stroke:

95.1 mm x 81.1 mm

Compression Ratio:

9.0:1

Engine Management:

Engine Control Module (ECM) with knock sensor and ignition timing control

Cooling System Type:

Pressurized, liquid-cooled

Ignition System Type:

Distributorless Ignition System (DIS) with coil-on-plug (COP) ignition

Timing Mechanism:

Timing Chain

🔧 Transmission

Standard Transmission:

4-speed Automatic Transmission

Optional Transmission:

N/A (Only automatic was offered for this specific model in North America)

Transmission Features:

Electronically controlled, Tow/Haul mode

Transfer Case Type:

Electronic Shift (2WD, 4WD Auto, 4WD High, 4WD Low)

📐 Dimensions

Wheelbase Regular Cab:

126.1 inches (3203 mm)

Wheelbase Crew Cab:

126.1 inches (3203 mm)

Bed Length Standard:

72.9 inches (1851 mm)

Bed Length Long:

N/A (Not offered on crew cab variants)

Overall Width:

Approx. 74.9 inches (1902 mm)

Overall Height:

Approx. 70.7 inches (1796 mm) for 2WD, 71.5 inches (1816 mm) for 4WD

Curb Weight Rwd Reg Cab:

Approx. 4,100 lbs (1860 kg)

Gross Vehicle Weight Rating Gvw:

Approx. 5,600 - 6,200 lbs (2540 - 2812 kg) depending on configuration

Max Towing Capacity:

Up to 6,200 lbs (2812 kg) with proper towing package

Max Payload Capacity:

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

Front Axle Capacity:

Approx. 2,500 lbs (1134 kg)

Rear Axle Capacity:

Approx. 3,100 lbs (1406 kg)

🛡️ Safety Features

NHTSA Rollover Rating:

4 out of 5 stars (for 2WD models)

Active Safety Features:

Anti-lock Braking System (ABS), Traction Control System (TCS)

Passive Safety Features:

Driver and Front Passenger Airbags, available Side Curtain Airbags (depending on trim and configuration), crumple zones, side-impact door beams

💡 Technology Features

Infotainment Features:

Base models featured a standard AM/FM radio with CD player. Optional upgrades included higher-output audio systems and possibly satellite radio compatibility. The manual covers the electrical system for these components.

Driver Assistance Features:

Limited; primarily focused on ABS and Traction Control for safety and stability.

Connectivity Features:

No advanced connectivity features like Bluetooth or USB were standard for 2005 models. The manual covers the wiring for optional auxiliary inputs if equipped.

🔧 Maintenance

Oil Change Interval:

Every 5,000 miles (8,000 km) or 6 months, whichever comes first (using synthetic blend or full synthetic oil recommended)

Engine Air Filter Replacement:

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

Transmission Fluid Change:

Every 30,000 - 60,000 miles (48,000 - 96,000 km) or 36 months, depending on towing and severe usage

Spark Plug Replacement:

Every 100,000 miles (160,000 km) for iridium-tipped spark plugs

Engine Oil Specification:

SAE 5W-30, API SN or newer certified (refer to manual for exact API classification for 2005)

Engine Oil Capacity:

6.0 US quarts (5.7 Liters) with filter change

Coolant Type:

Dex-Cool (Orange-colored, silicate-free, extended life coolant) or equivalent meeting GM6277M specification

Coolant Capacity:

Approx. 11.7 US quarts (11.1 Liters)

Automatic Transmission Fluid Type:

Dexron III H or Dexron VI

Brake Fluid Type:

DOT 3

Power Steering Fluid Type:

Dexron III H or equivalent

Transfer Case Fluid Type:

GM AutoTrak II Fluid or equivalent

Differential Fluid Type Rear:

SAE 75W-90 (GL-5 rated) for G80/G86/G92 axles. For G70 axle, SAE 80W-90 (GL-5 rated).

Known Issues:

Some reports of intermittent electrical gremlins, potential for exhaust manifold cracks (less common than on some other GM inline-5s), and typical wear-and-tear on suspension components for trucks of this age. The manual will detail diagnostic procedures for these and other potential issues.

📚 Vehicle History

Brand Heritage:

Isuzu has a long-standing reputation for producing robust diesel engines and reliable commercial vehicles. In the consumer market, they were known for SUVs like the Trooper and Rodeo, and their foray into pickup trucks in North America continued this theme of utility.

Model Evolution:

The I-350 was introduced for the 2005 model year as a replacement for the Isuzu Hombre. It shared its platform with the Chevrolet Colorado and GMC Canyon. It was produced for a short period, with the I-370 succeeding it for the 2007 model year. This manual specifically covers the initial 2005 iteration.

Production Location:

Shreveport, Louisiana, USA (via General Motors)

🏆 Awards & Recognition

Recognitions:

While the Isuzu I-350 itself did not garner major awards as a distinct model, its shared platform with the Colorado/Canyon meant it benefited from the development and testing of those successful trucks. Isuzu's long history with durable powertrains often earned them a reputation for reliability.