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
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Anti-Theft Systems
    • Fuel Filler Lid Opener - Late - Previous
    • Glass Hatch Opener - Late - Previous
    • Immobilizer Systems
    • IVIS (INFINITI Vehicle Immobilizer System - NATS) - Late - New
    • IVIS (INFINITI Vehicle Immobilizer System - NATS) - Late - Previous
    • Multi-Remote Control System - Late - New
    • Multi-Remote Control System - Late - Previous
    • Power Door Lock - Late - New
    • Power Door Lock - Late - Previous
    • Power Door Locks & Trunk Release
    • Smart Entrance Control Unit - Late - New
    • Vehicle Security (Theft Warning) System - Late - New
    • Vehicle Security (Theft Warning) System - Late - Previous
  • Communication Devices
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Automatic Drive Positioner - Early
    • INFINITI Communicator (IVCS) - Late - Previous
    • Integrated HOMELINK Transmitter - Early
    • Integrated HOMELINK Transmitter - Late - New
    • Integrated HOMELINK Transmitter - Late - Previous
    • Multi-Remote Control Systems
    • Smart Entrance Control Systems
  • Cruise Control Systems
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Automatic Speed Control Device - Late - New
    • Automatic Speed Control Device - Late - Previous
    • Cruise Control Systems
  • Exterior Lights
    • Back-Up Lights - Wiring
    • Exterior Lights
  • Gauges & Instrument Panels
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • A/T Indicator - Late - Previous
    • Compass And Thermometer - Early
    • Compass And Thermometer - Late - Previous
    • Instrument Panels
    • Meters And Gauges - Late - Previous
    • Warning Chime - Early
    • Warning Chime - Late - Previous
    • Warning Lamps - Early
    • Warning Lamps - Late - Previous
  • Headlights
    • Daytime Running Lights - Wiring Diagrams
    • Headlamp (For USA)
    • Headlight Aiming Systems
  • Heated Glass/Defoggers
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Rear Window Defogger - Early
    • Rear Window Defogger - Late - New
  • Infotainment
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Navigation System - Late - New
    • Power Antennas - Wiring
  • Interior/Illumination Lights
    • Illumination/Interior Lights
  • Memory Modules
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Automatic Drive Positioner - QX4 - Late - New
    • Automatic Drive Positioner - QX4 - Late - Previous
  • Mirrors
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Door Mirror - Late - New
    • Door Mirror - Late - Previous
    • Door Mirror Wiring Diagrams - Early
    • Power Mirrors - Wiring
  • Seats
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Heated Seat - Late - New
    • Heated Seat - Late - Previous
    • Heated Seat Wiring Diagrams - Early
    • Power Seat - Late - New
    • Power Seat - Late - Previous
    • Power Seat Wiring Diagrams - Early
    • Power Seats - Wiring
  • Steering Column Switches
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Combination Switch - Late - New
    • Combination Switch - Late - Previous
    • Horn - Late - New
    • Steering Column Switches
    • Steering Switch - Late - New
    • Steering Switch - Late - Previous
    • Turn Signal And Hazard Warning Lamps - Late - Previous
  • Warning Systems
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • A/T Indicator Wiring Diagram - Early
    • Warning Systems
  • Window Motors & Regulators
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Power Window - Late - Previous
    • Power Windows - Early
    • Power Windows - Late - New
  • Wiper/Washer Systems
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Front Wiper And Washer - QX4 - Late - New
    • Rear Wiper And Washer - Pathfinder - Late - New
    • Wiper/Washer Systems - G20, I30, Q45 & QX4
  • 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
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Anti-Theft Systems
    • Fuel Filler Lid Opener - Late - Previous
    • Glass Hatch Opener - Late - Previous
    • Immobilizer Systems
    • IVIS (INFINITI Vehicle Immobilizer System - NATS) - Late - New
    • IVIS (INFINITI Vehicle Immobilizer System - NATS) - Late - Previous
    • Multi-Remote Control System - Late - New
    • Multi-Remote Control System - Late - Previous
    • Power Door Lock - Late - New
    • Power Door Lock - Late - Previous
    • Power Door Locks & Trunk Release
    • Smart Entrance Control Unit - Late - New
    • Vehicle Security (Theft Warning) System - Late - New
    • Vehicle Security (Theft Warning) System - Late - Previous
  • Mirrors
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Door Mirror - Late - New
    • Door Mirror - Late - Previous
    • Door Mirror Wiring Diagrams - Early
    • Power Mirrors - Wiring
  • Seats
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Heated Seat - Late - New
    • Heated Seat - Late - Previous
    • Heated Seat Wiring Diagrams - Early
    • Power Seat - Late - New
    • Power Seat - Late - Previous
    • Power Seat Wiring Diagrams - Early
    • Power Seats - Wiring
  • Sun Roof/T-Top/Convertible Top
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Power Sunroof - Early
    • Power Sunroof - Late - New
    • Power Sunroofs (Late) - Wiring
  • Windows
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Power Window - Late - Previous
    • Power Windows - Early
    • Power Windows - Late - New
• Brakes
  • Anti-Lock Brakes
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Anti-Lock & Traction Control - Wiring Diagrams
    • Anti-Lock & Traction Control (Early)
    • Anti-Lock & Traction Control (Late)
  • Mechanical - Hydraulic
    • Disc Brakes & Drum Brakes
  • Traction Control
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Anti-Lock & Traction Control - Wiring Diagrams
    • Anti-Lock & Traction Control (Early)
    • Anti-Lock & Traction Control (Late)
• Drivelines & Axles
  • Axle Shafts
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Axle Shafts
    • Differential & Rear Axles (H233B)
    • Front Axle (Early)
    • Front Axle (Late)
    • Rear Axle
  • Differentials & Drive Axles
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Axle Shafts
    • Differential & Rear Axles (H233B)
    • Front Axle (Early)
    • Front Axle (Late)
    • Front Final Drive (Early)
    • Front Final Drive (Late)
    • Rear Axle
    • Rear Final Drive (Early)
    • Rear Final Drive (Late)
  • Driveshaft & Universal Joints
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Propeller Shaft (Early)
    • Propeller Shaft (Late)
  • Wheel Hubs
    • Front Axle (Early)
    • Front Axle (Late)
    • Rear Axle
• Electrical
  • Charging Systems
    • Generators & Regulators
  • Component Locations
    • Diagnostic Connector (DLC) Locations
    • Electrical Component Locator
  • Fuses & Circuit Breakers
  • Gauges
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • A/T Indicator - Late - Previous
    • Compass And Thermometer - Early
    • Compass And Thermometer - Late - Previous
    • Instrument Panels
    • Meters And Gauges - Late - Previous
    • Warning Chime - Early
    • Warning Chime - Late - Previous
    • Warning Lamps - Early
    • Warning Lamps - Late - Previous
  • Starters - HITACHI & MITSUBISHI
  • Wiring Diagrams
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Accessory Drive Belts
    • Specifications & Drive Belt Routing
  • Auxiliary Emission Control Systems
    • Emission Control System Visual Inspection Procedures - General Information
  • Cooling System (Mechanical)
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Engine Cooling System (Early)
    • Engine Cooling System (Late)
    • Specifications & Drive Belt Routing
  • Engine Mechanical 3.5L
  • Starters - HITACHI & MITSUBISHI
• Engine Performance
  • Engine Controls - On-Vehicle Adjustments
  • Application
    • Introduction
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Mode 6 - 2001 INFINITI
  • Engine Controls - Pin Voltage Charts
  • Remove, Overhaul & Install
    • Engine Controls - Removal, Overhaul & Installation
  • Sensor Range Charts
    • Engine Controls - Sensor Operating Range Charts
  • Specifications
    • Engine Controls - Service & Adjustment Specifications
    • Firing Order & Cylinder Identification
  • System
    • Engine Controls - Basic Diagnostic Procedures
    • Engine Controls - System & Component Testing
    • Engine Controls - Trouble Shooting - No Codes
    • Engine Controls Self-Diagnostics - 3.5
  • Testing & Diagnosis
    • Engine Controls - Basic Diagnostic Procedures
    • Engine Controls - System & Component Testing
    • Engine Controls - Trouble Shooting - No Codes
    • Engine Controls Self-Diagnostics - 3.5
  • Theory and Operation
    • Engine Controls - Theory & Operation
  • 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
  • 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
    • 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
    • General Information
  • Identification
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • CANADIAN Model Cross-Reference
    • General Information
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Diagnostic Trouble Code Definitions - General Information
    • General Information
    • How To Use The Engine Performance Section
    • Standardized Relay (Early)
    • Standardized Relay (Late)
  • Restraints
    • Air Bag And Supplemental Restraint System (SRS) Component Inspection & Replacement Tables
    • Air Bag Deactivation Procedures
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Towing
    • General Information
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • General Servicing
    • A/C Refrigerant Oil & Refrigerant Specifications
    • Air Conditioning Compressor Servicing
    • Air Conditioning System Compressor Applications
    • Air Conditioning System Compressor Refrigerant Oil Checking
    • Cabin Air Filter
    • HVAC Systems - General Servicing
  • HVAC Control Systems
    • Automatic A/C-Heater Systems
• Restraints
  • Air Bag, SRS
    • Air Bag Restraint Systems
  • Passive Restraints
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Seat Belts (Early)
• Steering
  • Manual Steering
    • Steering System
  • Power Steering
    • Steering System
  • Steering Column
  • Steering Gear
    • Rack & Pinion Power Steering System
• Suspension
  • Front Suspension
  • Rear Suspension
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Rear Suspension (Early)
    • Rear Suspension (Late)
  • Wheel Alignment Specifications & Adjustment Procedures
• Transmission
  • Automatic Trans
    • Automatic Transmission Diagnosis - Re4R01A
    • Automatic Transmission Overhaul
    • Automatic Transmission Shift Interlock System
    • Removal & Installation - A/T
    • Servicing - A/T
  • Transfer Case
    • * 2001 INFINITI QX4 Early & Late Model Identification *
    • Transfer Case - TX10A (Early)
• External Pages