2003 Toyota 4Runner Service and Repair Manual

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Factory-Grade Data

2003 Toyota 4Runner service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications, torque values, and reference data
  • Electrical diagnostics with full wiring diagrams
  • Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more
  • Diagnostic trouble codes and troubleshooting flow
  • Maintenance schedules and fluid capacities

Trims covered

  • Limited
  • SR5
  • Sport

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Maintenance & Lubrication
  • Specifications
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Diagnostic Trouble Codes
  • Technical Service Bulletins
  • Wiring Diagrams

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Vehicle Safety Data

2003 Toyota 4Runner Recalls & Complaints

NHTSA #11V11300024/02/2011Component: VEHICLE SPEED CONTROL:ACCELERATOR PEDAL

TOYOTA IS RECALLING CERTAIN MODEL YEAR 2008 THROUGH 2011 LEXUS LX570, 2003 THROUGH 2009 TOYOTA 4RUNNER, AND 2006 THROUGH 2010 RAV4 VEHICLES. THE ACCELERATOR PEDAL CAN GET STUCK IN THE WIDE OPEN POSIT

Consequence

A STUCK OPEN ACCELERATOR PEDAL MAY RESULT IN VERY HIGH VEHICLE SPEEDS AND MAKE IT DIFFICULT TO STOP

Remedy

THE REMEDY IS NOW AVAILABLE. THE SAFETY RECALL BEGAN EARLY APRIL 2011. THE REMEDY WILL INVOLVE MODI

NHTSA #02V33900017/12/2002Component: WHEELS

ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH FIVE FACTORY ALLOY WHEELS (MODEL 6934 AND 6936), WITH FACTORY LLAT, AND WITH PORT INSTALLED WR4, FOUR ALLOY WHEEL UPGRADE PROCESSED AT THE JACKSONVILLE,

Consequence

IF THE SPARE TIRE/WHEEL IS INSTALLED ON THE VEHICLE USING THE WHEEL NUTS PROVIDED FOR THE UPGRADE AL

Remedy

OWNERS WILL BE PROVIDED WITH DIFFERENT STYLE LUG NUTS, A WARNING LABEL FOR THE SPARE RE/ALLOY WHEEL,

NHTSA #03V14600014/04/2003Component: FUEL SYSTEM, GASOLINE

ON CERTAIN SPORT UTILITY VEHICLES EQUIPPED WITH V6 ENGINES, THE FUEL PULSATION DAMPER, LOCATED ON THE FUEL RAIL, MAY HAVE BEEN IMPROPERLY ASSEMBLED, CAUSING A DIAPHRAGM IN THE PULSATION DAMPER TO BE D

Consequence

THIS COULD RESULT IN AN ENGINE COMPARTMENT FIRE IF A HEAT SOURCE OR AN IGNITION SOURCE IS PRESENT.

Remedy

DEALERS WILL REPLACE THE PULSATION DAMPER. OWNER NOTIFICATION BEGAN MAY 5, 2003. OWNERS WHO TAK

TSB #11012744

The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and remain on a painted vehicl

TSB #11012743

To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and in

TSB #11012742

Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal areas such as the hood

TSB #11012735

Toyota vehicles are currently protected with RapgardTM protective film designed to protect the horizontal painted surfaces. This material protects from acid rain, environmental fallout, and rail contamination. Follow the Removal Procedure i

TSB #11012727

Vehicles may occasionally be subjected to contamination by airborne iron particles shed from railroad tracks, train wheels, exposure to heavy machinery facilities, grinding, welding, etc. This type of contamination can be identified by the

TSB #11007445

The condition known as acid rain is caused by airborne chemicals or particles in the atmosphere, which mix with rainwater, nighttime dew, or high humidity to form acidic compounds. If these contaminants settle and remain on a painted vehicl

TSB #11007444

To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and in

TSB #11007443

Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal areas such as the hood

Showing the 8 most recent of 175 technical service bulletins on file with NHTSA.

20190517Component: SERVICE BRAKESCrash reported1 injured

THE CONTROL ARM SEPARATED FROM THE ROTTED RUSTED FRAME WHILE DRIVING. ALMOST DIED!

20190517Component: STEERINGCrash reported1 injured

THE CONTROL ARM SEPARATED FROM THE ROTTED RUSTED FRAME WHILE DRIVING. ALMOST DIED!

20190517Component: SUSPENSIONCrash reported1 injured

THE CONTROL ARM SEPARATED FROM THE ROTTED RUSTED FRAME WHILE DRIVING. ALMOST DIED!

20151103Component: AIR BAGSCrash reported1 injured

DRIVING 45 MPH IN A 45 MPH ZONE ON CITY STREET WHEN A PICKUP TRUCK FAILED TO YIELD RIGHT-OF-WAY AND PULLED IMMEDIATELY IN FRONT OF 4RUNNER. ALMOST ZERO TIME FOR BREAKING. 4RUNNER HIT PICKUP TRUCK BEH

20140318Component: AIR BAGSCrash reported1 injured

I WAS STOPPED ON THE HIGHWAY BEHIND A TRUCK MAKING A LEFT TURN WHEN I WAS REAR ENDED BY ANOTHER TRUCK GOING 60 MPH. MY 4RUNNER WAS CRUSHED BETWEEN THEM, TOTALED, AND MY AIR BAGS NEVER DEPLOYED. I H

Showing the 5 most serious of 718 complaints filed with NHTSA.

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