2003 Jeep Grand Cherokee WJ , WG Service Manual – Diagnostic

This 2003 Jeep Grand Cherokee WJ, WG Service & Repair Manual Covers

• Complete factory workshop procedures
• Factory diagnostic information
• Component removal and installation
• Repair and overhaul procedures
• Technical specifications
• Factory maintenance procedures
• Factory wiring diagrams
• Torque specifications
• Fuse and relay information
• Diagnostic flow charts

Engine Options

• 4.0L PowerTech Inline-6 Petrol
• 4.7L PowerTech V8 Petrol
• 4.7L High Output PowerTech V8 Petrol
• 2.7L CRD Inline-5 Turbo Diesel

Transmission Options

• 42RE 4-speed Automatic Transmission
• 45RFE 5-speed Automatic Transmission
• 545RFE 5-speed Automatic Transmission
• 5-speed NAG1/W5J400 Automatic Transmission

Engine and Drivetrain Repair Coverage

• Engine overhaul procedures
• Cylinder head servicing
• Valve train servicing
• Timing chain inspection and servicing
• Timing chain replacement procedures
• Petrol fuel injection diagnostics
• Diesel common rail injection diagnostics
• Diesel fuel injector testing
• High-pressure diesel fuel system diagnostics
• Ignition system servicing
• Ignition coil diagnostics
• Throttle body servicing
• Intake manifold servicing
• Cooling system repairs
• Lubrication system servicing
• Emissions system diagnostics
• Automatic transmission diagnostics
• Automatic transmission servicing
• Torque converter servicing
• Transfer case servicing
• Front differential servicing
• Rear differential servicing
• Driveshaft servicing
• Universal joint servicing
• CV joint inspection and repair

Turbocharged and Diesel Technologies

• Common rail diesel injection diagnostics
• High-pressure fuel system diagnostics
• Diesel injector testing
• Turbocharger diagnostics
• Charge-air system inspection
• Intercooler system servicing
• EGR diagnostics
• Diesel engine management diagnostics
• Diesel glow plug system diagnostics

4WD and AWD Technologies

• Quadra-Trac 4WD diagnostics
• Quadra-Drive system diagnostics
• Transfer case diagnostics
• Front differential diagnostics
• Rear differential diagnostics
• Vari-Lok differential servicing
• Propeller shaft inspection
• Driveshaft servicing
• 4WD control system diagnostics

Chassis, Steering and Suspension

• Front coil-spring suspension servicing
• Rear coil-spring suspension servicing
• Front upper and lower control arm servicing
• Rear control arm servicing
• Steering linkage inspection
• Power steering diagnostics
• Steering gear servicing
• Steering column servicing
• Shock absorber replacement
• Coil spring inspection
• Stabiliser bar servicing
• Wheel bearing servicing
• Wheel alignment specifications

Braking Systems

• ABS diagnostics
• Electronic Brakeforce Distribution diagnostics
• Brake hydraulic system bleeding
• Brake master cylinder servicing
• Brake booster servicing
• Front disc brake servicing
• Rear disc brake servicing
• Parking brake servicing
• Wheel speed sensor diagnostics
• ABS hydraulic control unit diagnostics

Electrical Systems and Wiring

• Complete factory wiring diagrams
• Engine management system
• Petrol fuel injection wiring
• Diesel fuel injection wiring
• Starting system diagnostics
• Charging system diagnostics
• Alternator servicing
• Battery testing
• Immobiliser diagnostics
• Vehicle theft security system diagnostics
• Instrument cluster diagnostics
• Body Control Module diagnostics
• CAN communication diagnostics
• Lighting system diagnostics
• Audio system wiring
• Power window diagnostics
• Power seat diagnostics
• Central locking diagnostics
• Cruise control diagnostics
• Trailer wiring diagnostics

Air Conditioning and HVAC

• Automatic temperature control diagnostics
• Air conditioning compressor servicing
• Refrigerant system repairs
• HVAC control module diagnostics
• Blower motor servicing
• Blend door actuator diagnostics
• Air distribution system servicing
• Heater system servicing
• Rear HVAC system servicing

Body, Interior and Restraint Systems

• Body panel removal and installation
• Door servicing
• Bonnet and tailgate adjustment
• Dashboard removal procedures
• Interior trim servicing
• Power seat servicing
• SRS airbag diagnostics
• Seat belt pretensioner servicing
• Vehicle theft security system servicing
• Sunroof servicing
• Wiper and washer system servicing

Diagnostics and Troubleshooting

• Factory diagnostic flow charts
• DRB scan tool diagnostic procedures
• Symptom-based troubleshooting
• Powertrain Control Module diagnostics
• Transmission Control Module diagnostics
• Sensor testing procedures
• Actuator testing
• CAN communication diagnostics
• Electrical fault isolation
• Component inspection procedures
• Emissions diagnostic procedures

Common Error Codes Covered

Engine Codes

• P0123 — Throttle Position Sensor/Accelerator Pedal Position Sensor A Circuit High Input
• P0130 — O2 Sensor Circuit Malfunction (Bank 1, Sensor 1)
• P0131 — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1)
• P0171 — System Too Lean (Bank 1)
• P0300 — Random/Multiple Cylinder Misfire Detected
• P0320 — Ignition/Distributor Engine Speed Input Circuit Malfunction
• P0340 — Camshaft Position Sensor Circuit Malfunction
• P0456 — EVAP System Leak Detected (Very Small Leak)
• P0505 — Idle Air Control System Malfunction

Transmission Codes

• P0700 — Transmission Control System Malfunction
• P0715 — Input/Turbine Speed Sensor Circuit Malfunction
• P0720 — Output Speed Sensor Circuit Malfunction
• P0731 — Gear 1 Incorrect Ratio
• P0732 — Gear 2 Incorrect Ratio
• P0733 — Gear 3 Incorrect Ratio
• P0734 — Gear 4 Incorrect Ratio
• P0740 — Torque Converter Clutch Circuit Malfunction
• P0741 — Torque Converter Clutch Performance or Stuck Off
• P0750 — Shift Solenoid A Malfunction

ABS and Chassis Codes

• C1015 — Left Front Wheel Speed Sensor Circuit
• C1020 — Right Front Wheel Speed Sensor Circuit
• C1035 — Left Rear Wheel Speed Sensor Circuit
• C1040 — Right Rear Wheel Speed Sensor Circuit
• C1219 — Anti-Lock Brake System Pump Motor Circuit

Network Communication Codes

• U0100 — Lost Communication With ECM/PCM
• U0101 — Lost Communication With Transmission Control Module
• U0121 — Lost Communication With Anti-Lock Brake System Control Module
• U0140 — Lost Communication With Body Control Module

Body Control Codes

• B1000 — Electronic Control Module Internal Fault
• B1326 — Control Module Power Circuit Low Voltage
• B212D — Vehicle Theft Security System Fault

Plus many other codes included in the manual.

Fuse Box Diagram

• Power Distribution Centre layout
• Junction block layout
• Engine compartment fuse locations
• Interior fuse locations
• Relay locations
• Fuse identification charts
• Fuse amperage specifications
• Power distribution diagrams

Wiring Diagrams

• Engine management system
• Petrol fuel injection system
• Diesel common rail injection system
• Ignition system
• Starting and charging systems
• Automatic transmission
• Transfer case
• 4WD control system
• Differential systems
• ABS system
• Air conditioning system
• Automatic temperature control
• SRS airbag system
• Instrument cluster
• Immobiliser system
• Vehicle theft security system
• Body control system
• CAN communication network
• Lighting system
• Audio system
• Power windows
• Power seats
• Central locking
• Cruise control
• Trailer electrical system

Serpentine Belt and Timing System Information

• Accessory drive belt routing
• Serpentine belt inspection procedures
• Serpentine belt replacement procedures
• Belt tensioner servicing
• Timing chain inspection
• Timing chain servicing
• Camshaft timing procedures
• Timing component inspection

Torque Specifications

• Engine fastener torque values
• Cylinder head torque specifications
• Main bearing torque values
• Connecting rod torque values
• Intake and exhaust manifold torque values
• Automatic transmission torque specifications
• Transfer case torque specifications
• Differential torque specifications
• Driveshaft torque specifications
• Suspension torque specifications
• Steering component torque values
• Brake system torque values
• Wheel nut torque specifications

Maintenance and Service Information

• Factory scheduled maintenance intervals
• Engine oil and filter replacement
• Diesel fuel filter replacement
• Automatic transmission fluid servicing
• Transfer case fluid replacement
• Front differential oil servicing
• Rear differential oil servicing
• Engine coolant replacement
• Brake fluid replacement
• Power steering fluid servicing
• Spark plug replacement
• Glow plug inspection
• Engine air filter replacement
• Cabin air filter servicing
• Drive belt inspection
• Battery inspection
• Tyre rotation procedures
• Wheel alignment checks

Who Is This Manual For?

• New Zealand automotive workshops
• Independent repair garages
• Jeep specialists
• Automotive technicians
• Diesel specialists
• Auto electricians
• Diagnostic specialists
• Fleet maintenance teams
• DIY owners
• Automotive training institutions