Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures
  • DTC Index
  • Electrical Component Locations
    • Electrical Component Locator
  • Fluids
  • Technical Bulletins
    • Technical Service Bulletins
  • Wiring Diagrams
    • OEM Connector End Views
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Accessories Control Systems
    • Garage Door Opener System
  • Anti-Theft Systems
    • Door System, Mirror System & Window System
    • Keyless Entry System
    • Theft Deterrent System
  • Communication Devices
    • Body Control System
    • Data Link Communications System
  • Cruise Control Systems
  • Entertainment Systems
  • Exterior Lights
    • Lighting Systems
  • Gauges & Instrument Panels
    • Instrument Panel, Gages, And Console
  • Headlights
    • Lighting Systems
  • Heated Glass/Defoggers
    • Stationary Window System
  • Horns
    • Horn System
  • Ignition Switch/Steering Lock
    • Steering Wheel & Steering Column
  • Infotainment
    • Entertainment System
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    • Exterior Trim
    • Instrument Panel, Gages, And Console
    • Interior Trim
  • Interior/Illumination Lights
    • Lighting Systems
  • Memory Modules
    • Personalization Systems
  • Mirrors
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Seats
    • Seat System
  • Steering Column Switches
    • Steering Wheel & Steering Column
  • Window Motors & Regulators
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Wiper/Washer Systems
    • Wiper System And Washer System
• Body & Frame
  • Door Locks
    • Door System, Mirror System & Window System
    • Keyless Entry System
    • Theft Deterrent System
  • Exterior Body Panels
    • Body Front End
    • Body Rear End
    • Bumper System
  • Exterior/Interior Trim
    • Exterior Trim
    • Instrument Panel, Gages, And Console
    • Interior Trim
  • Frames, Subframes & Crossmembers
    • Frame And Underbody
  • Ignition Switch/Steering Lock
    • Steering Wheel & Steering Column
  • Mirrors
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Seats
    • Seat System
  • Sun Roof/T-Top/Convertible Top
    • Sunroof System & Luggage Carrier
  • Windows
    • Door System, Mirror System & Window System
    • Stationary Window System
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System
  • Mechanical - Hydraulic
    • Disc Brakes & Drum Brakes
  • Traction Control
    • Antilock Brake System
• Drivelines & Axles
  • Axle Shafts
    • Axle Shafts - Front
    • Vibration - Drivetrain
  • Differentials & Drive Axles
    • Front Drive Axle - 4WD
    • Rear Drive Axle
    • Rear Drive Axle - Locking/Limited Axle
    • Vibration - Drivetrain
  • Driveshaft & Universal Joints
    • Propeller Shaft And Universal Joints
    • Vibration - Drivetrain
• Electrical
  • Body Electrical
    • Battery, Charging System & Starting System
    • Engine Controls - PID Values, Pcm Connector Views And Terminal Identification
    • OEM Connector End Views
    • Retained Accessory Power System
    • Testing Wiring Systems For Intermittent & Poor Connections
    • Wiring Systems (General Information)
  • Charging Systems
    • Battery, Charging System & Starting System
    • Charging System
  • Component Locations
    • Electrical Component Locator
  • Fuses & Circuit Breakers
  • Gauges
    • Instrument Panel, Gages, And Console
  • Horns
    • Horn System
  • Motors, Switches, Relays
    • Battery, Charging System & Starting System
    • Engine Controls - PID Values, Pcm Connector Views And Terminal Identification
    • OEM Connector End Views
    • Retained Accessory Power System
    • Testing Wiring Systems For Intermittent & Poor Connections
    • Wiring Systems (General Information)
  • Starter
    • Battery, Charging System & Starting System
    • Starting System
  • Wiring Diagrams
    • OEM Connector End Views
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Accessory Drive Belts
    • Cooling System Specifications & Drive Belt Routing
  • Cooling System (Mechanical)
    • Cooling System Specifications & Drive Belt Routing
    • Engine Cooling System
  • Engine Exhaust System
  • Engine Mechanical - 4.3L (LU3)
  • Starter
    • Battery, Charging System & Starting System
    • Starting System
• Engine Performance
  • Engine Controls - On-Vehicle Adjustments - Trucks (Except Tracker)
  • Application
    • Engine/VIN Breakdown
  • Emissions
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Mode 6 - Class 2 & GMLAN
  • Pin Voltage Charts
    • Engine Controls - PID Values, Pcm Connector Views And Terminal Identification
  • Remove, Overhaul & Install
    • Engine Performance System Removal & Installation
  • Sensor Range Charts
    • Engine Controls - Sensor Operating Range Charts
  • Specifications
    • Engine Controls - Service & Adjustment Specifications - 4.3L
    • Firing Order & Cylinder Identification
  • System
    • Engine Controls - Basic Diagnostic Procedures - 4.3L
    • Engine Controls - Self-Diagnostics - 4.3L
    • Engine Controls - Strategy Based Engine Diagnosis
    • Engine Controls - System & Component Testing - 4.3L
    • Engine Controls - Trouble Shooting - No Codes - 4.3L
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Testing & Diagnosis
    • Engine Controls - Basic Diagnostic Procedures - 4.3L
    • Engine Controls - Self-Diagnostics - 4.3L
    • Engine Controls - Strategy Based Engine Diagnosis
    • Engine Controls - System & Component Testing - 4.3L
    • Engine Controls - Trouble Shooting - No Codes - 4.3L
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Theory and Operation
    • Engine Controls - Theory & Operation - 4.3L
  • Engine Vacuum Diagrams
• General Information
  • Abbreviations
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
  • Basic Trouble Shooting
    • Basic Trouble Shooting - General Information
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
    • Engine Performance - Trouble Shooting - General Information
  • Brakes
    • Anti-Lock Brake Safety Precautions - General Information
    • Map - Brake Systems
    • Map - Routine Inspection Reference Guide
  • Check Lists
    • Symptom Check List Worksheet - General Information
  • Computer Relearn Procedures
  • Driveline/Axles
    • Drive Axle Noise Diagnosis - General Information
    • Gear Tooth Contact Patterns - General Information
    • Map - Drive Train & Transmission
    • Trouble Shooting - Clutches - General Information
  • DTC Index
  • Electrical
    • Map - Electrical Systems
    • Testing Wiring Systems For Intermittent & Poor Connections
    • Using lemon2025'S System Wiring Diagrams
  • Engine
    • Engine Overhaul Procedures - General Information
    • General Cooling System Service - General Information
  • Engine Performance
    • Electrostatic Discharge Warning - General Information
    • Engine Performance Diagnostic Routine Outline - General Information
    • Engine Performance Safety Precautions
    • Map - Engine Performance & Maintenance
    • Parasitic Load Explanation & Test Procedures - General Information
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
    • Waveforms - Injector Pattern Tutorial - General Information
  • Map - Exhaust Systems
  • Heating, Ventilation & A/C (HVAC)
    • Map - Heating, Ventilation, & Air Conditioning
  • Hoist/Jack
    • Jacking And Lifting
  • Identification
    • CANADIAN Model Cross-Reference
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • Engine Controls - Strategy Based Engine Diagnosis
    • Gm Vehicles Cautions & Notices
    • Testing Wiring Systems For Intermittent & Poor Connections
    • Vibration - Drivetrain
    • Vibration Symptoms Diagnosis And Correction
  • RPO Codes
    • RPO Code Description (Codes U11-Us9)
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • General Servicing
    • Cabin Air Filter (Special Applications) - General Information
  • HVAC Control Systems
    • Heating, Ventilation And Air Conditioning
    • HVAC Systems - Manual
• Restraints
  • Air Bag, SRS
    • Supplemental Inflatable Restraint System
  • Restraints Control Systems
    • Seat Belt System
  • Seat Belts
    • Seat Belt System
• Steering
  • Manual Steering
    • Power Steering System
  • Power Steering System
  • Steering Wheel & Steering Column
  • Steering Linkage (Non-Rack & Pinion)
• Suspension
  • Front Suspension
    • Front Suspension System
    • Suspension System General Diagnosis
  • Rear Suspension
    • Rear Suspension System
    • Suspension System General Diagnosis
  • Wheel Alignment
    • Wheel Alignment Specifications
    • Wheel Alignment Specifications & Adjustment Procedures
  • Wheels & Tire System
    • Tires And Wheels
• Transmission
  • Automatic Trans
    • Shift Interlock System
  • Manual Transmission Clutches
  • Manual Trans
    • Manual Transmission - NV 3500
    • Manual Transmission - NV 3500 (Unit Repair)
    • Manual Transmission Servicing
  • Transfer Case
    • Transfer Case - NVG 236-NP8 (Unit Repair)
    • Transfer Case - NVG 236/246-NP8 (Two Speed Automatic)
    • Transfer Case - Removal & Installation
    • Transfer Case - Servicing
• External Pages