Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures
  • DTC Index
  • Electrical Component Locations
    • Diagnostic Connector (DLC) Locations
    • Electrical Component Locator
  • Fluids
  • Technical Bulletins
    • Campaigns
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • Anti-Theft System
    • Power Door Lock System
    • Power Rear Compartment & Fuel Door Release Systems
    • Remote Keyless Entry Systems
  • Communication Devices
    • Body Control Modules
  • Cruise Control Systems
  • Exterior Lights
    • Exterior Lighting Systems - Wiring Diagrams
    • Lighting Systems - Back-Up Light System - Wiring Diagrams
  • Gauges & Instrument Panels
    • Analog Instrument Panels
  • Headlights
    • Exterior Lighting Systems - Wiring Diagrams
    • Headlight Systems & Daytime Running Lights Systems - Wiring Diagrams
  • Heated Glass/Defoggers
    • Rear Window Defogger & Mirror Defogger
  • Ignition Switch/Steering Lock
    • Steering Column & Steering Column Switches
  • Interior/Illumination Lights
    • Illumination - Interior Lighting Systems Wiring Diagrams
  • Mirrors
    • Auto Dimming Mirror
    • Power Mirror System
  • Seats
    • Power Seat System
  • Steering Column Switches
    • Steering Column
    • Steering Column & Steering Column Switches
  • Warning Systems
    • Warning System - Wiring Diagrams
  • Window Motors & Regulators
    • Power Window System
  • Wiper/Washer Systems
    • Wiper System And Washer System
  • Wiring System (Data Link Connectors, Pwr Dist., Grnd Dist.)
    • Data Link Connector Wiring Diagrams
    • Ground Distribution - Wiring Diagrams
    • Power Distribution - Wiring Diagrams
• Body & Frame
  • Door Locks
    • Anti-Theft System
    • Power Door Lock System
    • Power Rear Compartment & Fuel Door Release Systems
    • Remote Keyless Entry Systems
  • Ignition Switch/Steering Lock
    • Steering Column & Steering Column Switches
  • Mirrors
    • Auto Dimming Mirror
    • Power Mirror System
  • Seats
    • Power Seat System
  • Sun Roof/T-Top/Convertible Top
    • Power Sun Roofs
  • Windows
    • Power Window System
• Brakes
  • Anti-Lock Brakes
    • Anti-Lock Brake System - 4WAL
    • Anti-Lock Brake System - Wiring Diagrams
  • Mechanical - Hydraulic
    • Disc Brakes & Drum Brakes
  • Traction Control
    • Anti-Lock Brake System - 4WAL
    • Anti-Lock Brake System - Wiring Diagrams
• Drivelines & Axles
  • Differentials & Drive Axles
    • Differentials - EATON Locking - Trucks
    • Drive Axle - 7 5/8", 8 1/2", 8 5/8" & 9 1/2" Ring Gears
  • Driveshaft & Universal Joints
    • Drive Shaft & Universal Joints
• Electrical
  • Body Electrical
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Charging Systems
  • Component Locations
    • Diagnostic Connector (DLC) Locations
    • Electrical Component Locator
  • Fuses & Circuit Breakers
  • Gauges
    • Analog Instrument Panels
  • Motors, Switches, Relays
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Starter
    • Starting System
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Accessory Drive Belts
    • Engine Cooling System Specifications & Drive Belt Routing
  • Auxiliary Emission Control Systems
    • Emission Control System Visual Inspection Procedures - General Information
  • Cooling System (Mechanical)
    • Engine Cooling System Specifications & Drive Belt Routing
  • Mechanical
    • Engine Mechanical - 4.3L
    • Engine Mechanical - 4.3L Unit Repair
  • Starter
    • Starting System
• Engine Performance
  • Engine Controls - On-Vehicle Adjustments
  • Application
    • Engine/VIN Breakdown
  • Emissions
    • EGR Function Testing - General Motors Trucks
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Pin Voltage Charts
    • Engine Controls - Engine PID Value Charts
  • Remove, Overhaul & Install
    • Engine Controls - Removal, Overhaul & Installation
  • Engine Controls - Sensor Range Charts
  • Specifications
    • Engine Controls - Service & Adjustment Specifications
    • Firing Order & Cylinder Identification
  • System
    • Engine Controls - Basic Diagnostic Procedures
    • Engine Controls - Distributor Installation - 4.3L V6, 5.0L, 5.7L & 7.4L - Truck
    • Engine Controls - System & Component Testing
    • Engine Controls - Trouble Shooting - No Codes
    • Engine Controls Self-Diagnostics - 4.3L
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Testing & Diagnosis
    • Engine Controls - Basic Diagnostic Procedures
    • Engine Controls - Distributor Installation - 4.3L V6, 5.0L, 5.7L & 7.4L - Truck
    • Engine Controls - System & Component Testing
    • Engine Controls - Trouble Shooting - No Codes
    • Engine Controls Self-Diagnostics - 4.3L
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Theory and Operation
    • Engine Controls - Theory & Operation
  • 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
  • OBD-II Drive Cycles - 2001-03
  • 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
  • Identification
    • CANADIAN Model Cross-Reference
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • Gm Vehicles Cautions & Notices
    • Testing Wiring Systems For Intermittent & Poor Connections
  • Maintenance Reminder Light (Reset Procedures)
  • Restraints
    • Supplemental Inflatable Restraint System Component Inspection & Replacement Tables.
  • RPO Codes
    • RPO Code Description (Codes 001-19F)
    • RPO Code Description (Codes 19H-2EL)
    • RPO Code Description (Codes 2F1-44I)
    • RPO Code Description (Codes 44L-5J9)
    • RPO Code Description (Codes 5K0-6FF)
    • RPO Code Description (Codes 6FG-76A)
    • RPO Code Description (Codes 76D-7XD)
    • RPO Code Description (Codes 7XF-8M0)
    • RPO Code Description (Codes 8M1-9C0)
    • RPO Code Description (Codes 9C1-A0F)
    • RPO Code Description (Codes A0G-Ar4)
    • RPO Code Description (Codes Ar5-BCP)
    • RPO Code Description (Codes BCQ-C12)
    • RPO Code Description (Codes C13-Cur)
    • RPO Code Description (Codes Cut-Dir)
    • RPO Code Description (Codes Dr7-EHE)
    • RPO Code Description (Codes EHF-F5P)
    • RPO Code Description (Codes F5Q-G1V)
    • RPO Code Description (Codes G1W-HFN)
    • RPO Code Description (Codes HFO-JRG)
    • RPO Code Description (Codes JRH-KLY)
    • RPO Code Description (Codes KLZ-LQX)
    • RPO Code Description (Codes LQY-MW9)
    • RPO Code Description (Codes MWE-ODK)
    • RPO Code Description (Codes ODL-Ora)
    • RPO Code Description (Codes Orb-PDE)
    • RPO Code Description (Codes PDF-QH6)
    • RPO Code Description (Codes QH7-R8D)
    • RPO Code Description (Codes R8E-T07)
    • RPO Code Description (Codes T08-TJ0)
    • RPO Code Description (Codes TJ1-U10)
    • RPO Code Description (Codes U11-Us9)
    • RPO Code Description (Codes USB-VG9)
    • RPO Code Description (Codes VGA-W5Y)
    • RPO Code Description (Codes W5Z-XE3)
    • RPO Code Description (Codes XE4-Y9Z)
    • RPO Code Description (Codes Ya2-ZD9)
    • RPO Code Description (Codes ZDE-ZZZ)
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • A/C Compressor
    • HVAC System - Compressor Clutch Controls
  • General Servicing
    • Cabin Air Filter (Special Applications) - General Information
    • HVAC System - Compressor Applications & Body Designations
    • HVAC System - Compressor Refrigerant Oil Checking
    • HVAC System - Compressor Servicing
    • HVAC System - General Servicing Procedures
    • HVAC System - Refrigerant Oil & Refrigerant Specifications
  • HVAC Control Systems
    • Heater System - RWD Trucks (Old Style) & Vans
    • Heater System - Trouble Shooting - RWD Trucks & Vans
    • HVAC System - Automatic
    • HVAC System - Manual
    • HVAC System - Manual - Troubleshooting
• Restraints
  • Air Bag, SRS
    • Supplemental Inflatable Restraint System
• Steering
  • Manual Steering
    • Four Wheel Drive Steering Knuckles
    • Power Recirculating Ball Steering - Trucks - Except Tracker
  • Power Steering
    • Four Wheel Drive Steering Knuckles
    • Power Recirculating Ball Steering - Trucks - Except Tracker
  • Steering Column
    • Steering Column
    • Steering Column & Steering Column Switches
• Suspension
  • Electronic Suspension Control System - Wiring Diagrams
  • Front Suspension - 2WD
  • Rear Suspension System
  • Wheel Alignment Specifications & Adjustment Procedures
• Transmission
  • Automatic Trans
    • Automatic Transmission - 4L60-E/4L65-E - Overhaul & Testing
    • Automatic Transmission Diagnosis - 4L60-E
    • Automatic Transmission Removal & Installation
    • Automatic Transmission Servicing
    • Shift Interlock Systems
  • Automatic Transmission Hydraulic Diagrams - 4L60-E
• External Pages