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2003 Toyota Highlander CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Toyota REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Cabin Air Filter Locations & Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
A/C & HEATER SERVICE PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Toyota -> Automatic Temperature Control System Diagnosis & Testing -> Description
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
The Automatic Temperature Control system provides automatic control of A/C compressor operation, air inlet door position, water valve operation and blower speeds in order to maintain passenger compartment temperature within the range selected by the operator.
The system control circuit consists of a feedback potentiometer, temperature control rheostat, and ambient and in-vehicle temperature senso...
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BRAKE SERVICE PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Toyota -> Hydraulic Brake Systems -> Component Service -> Assemble -> Disassemble -> Except Sienna -> Inspection -> Master Cylinder -> Overhaul -> Sienna -> Wheel Cylinders
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
Master Cylinder
Except Sienna
Disassemble
For the following procedures, refer to Fig. for assistance.
- Remove master cylinder boot.
- Remove setscrew and reservoir tank, then the cap and strainer from reservoir.
- Remove two grommets and place cylinder in vise.
- Push piston in and remove stopper bolt, Fig. .
- Push pistons in and remove snap ring, then No. 1 piston carefully by hand.
- Place cylinder on edges of two wooden blocks and tap on cylinder until No. 2 piston comes out.
Inspection
Clean components with compressed air. Inspect cylinder bore for rust and scoring. Also, inspect for wear or ...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Toyota -> Fuel Filter Scheduled Maintenance -> 1986-06 Models -> Normal Service -> Severe Service
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
Normal Service
Service as r...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
DRIVESHAFT, Replace
Vehicle: 2003 Toyota Highlander 3.0 V6 GAS
- Raise and support vehicle.
- Remove exhaust pipe.
- Have an assistant depress and hold brake pedal.
- Loosen the cross groove joint set bolts a 1/2 turn.
- Place reference marks on both flanges.
- Remove nuts, bolts and washers at flanges.
- Remove bolts and adjusting shims from...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Starter, Replace
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
- Disconnect battery ground cable.
- On models equipped with audio coded anti-theft system, obtain three-digit system code.
- On all models, if required, remove battery, battery tray and/or igniter bracket.
- Remove air cleaner assembly, if required.
- Disconnect electrical connec...
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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Cabin Air Filter Service -> Toyota -> 2003-07 Highlander & 2006-07 Highlander HV
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
On 2003 models, under normal operating conditions the cabin air filter should be replaced every 22,500 miles. In dusty areas change the cabin air filter every 10,000 miles.
On 2004-07 models, the cabin air filter should be cleaned every 18 months or 15,000 miles and replaced every 36 months or 30,000 miles. The filter should be replaced more often if air flow is less than normal.
- Remove the screw retaining the eyelet clip, Fig. .
- Open the glove compartment door.
- Push inward at each side of the glove compartment door to disengage the retainers, then lower t...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Toyota -> Low Coolant Lamp ->
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
This lamp will be illuminated when the coolant level in the radiator drops below a pre-determined point. To reset the lamp, bring the c...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
Lower
- Disconnect battery ground cable.
- Drain cooling system into a suitable container by loosening drain plug of radiator.
- Reposition hose clamp at radiator outlet.
- Remove hose from radiator.
- Reposition hose clamp at water inlet.
- Remove hose from water inlet.
- Remove hose from vehicle.
- Reverse procedure t...
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SERPENTINE BELT SERVICE PROCEDURES FOR 2003 Toyota Highlander AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2003 Toyota Highlander 2.4 L4 GAS
- Rotate or lift the belt tensioner arm, using a suitable tool to relieve tension from dr...
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COMPONENT LOCATION DIAGRAMS FOR 2003 Toyota Highlander AUTOMOBILES
Component location diagrams for most 2003 Toyota Highlander cars and light trucks sold in the U.S. from 1990+.
Seat Heater Components Diagram for 2003 Toyota Highlander 2.4 L4 GAS Components on diagram: |
Engine Immobilizer Components Diagram for 2003 Toyota Highlander 3.0 V6 GAS Components on diagram: |
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WIRING DIAGRAMS FOR 2003 Toyota Highlander AUTOMOBILES
OEM drawn wiring diagrams for most 2003 Toyota Highlander cars and light trucks sold in the U.S.
2003 Toyota Highlander 2.4 L4 GAS Wiring Diagram Components on diagram: |
2003 Toyota Highlander 3.0 V6 GAS Wiring Diagram Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2003 Toyota Highlander AUTOMOBILES
OEM TSB listings for most 2003 Toyota Highlander cars and light trucks sold in the U.S. from 1985+.
Document: Abnormal Horn Operation Vehicle: 2003 Toyota Highlander 3.0 V6 GAS Auto Systems: |
Document: ABNORMAL HORN OPERATION Vehicle: 2003 Toyota Highlander 3.0 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2003 Toyota Highlander AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2003 Toyota Highlander cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 2003 Toyota Highlander cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 2003 Toyota Highlander cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 2003 Toyota Highlander cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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