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2003 Toyota Tundra CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Toyota REPAIR SHOPS DON'T WANT YOU TO KNOW
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- 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 Tundra AUTOMOBILES
Imported Cars & Light Trucks & Vans -> 2003-04 -> System Inspection -> Compressor -> Condenser -> Evaporator -> Receiver-Drier/Accumulator -> Refrigerant Line Restrictions -> Thermostatic Expansion Valve
Vehicle: 2003 Toyota Tundra 3.4 V6 GAS
While a detailed diagnostic procedure for all air conditioning systems would be impractical due to the many variations in construction and operation, there are three fundamental components of a total diagnosis:
- Refrigerant systems must have an adequate, but not excessive charge.
- Determination must be made whether the refrigerant system is governed by a cycling clutch compressor or by valves which control evaporator pressure.
- The air distribution system (blower motor, switches, vacuum lines and air ducts) must be operational before checking the ...
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BRAKE SERVICE PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Toyota -> Power Brake Units -> Adjustments -> Brake Pedal Height & Freeplay
Vehicle: 2003 Toyota Tundra 4.7 V8 GAS
Brake Pedal Height & Freeplay
Refer to Fig. for pedal height and freeplay references.
- Loosen stop light switch, then the clevis locknut.
- Adjust pedal height by turning pushrod.
- Tighten locknut an...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Toyota -> Fuel Filter Scheduled Maintenance -> 1986-06 Models -> Normal Service -> Severe Service
Vehicle: 2003 Toyota Tundra 4.7 V8 GAS
Normal Service
Service as r...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
DRIVESHAFT, Replace -> Front -> Rear
Vehicle: 2003 Toyota Tundra 3.4 V6 GAS
Front
- Place vehicle in neutral.
- Release parking brake.
- Raise and support vehicle and support it with safety stands in proper locations.
- Place matchmarks on the propeller shaft and front differential flanges.
- Remove bolts, nuts, and washers from differential flange.
- Suspend the front side of the propeller shaft.
- Place matchmarks on the propeller shaft and transfer flanges.
- Remove bolts, nuts, and washers from transfer flanges.
- Remove front propeller shaft.
- Reverse procedure to install, noting the following:
- Torque differential flange bolts to 54 ft. lbs.
- Torque ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Alternator, Replace
Vehicle: 2003 Toyota Tundra 3.4 V6 GAS
- Disconnect battery ground cable at battery.
- Disconnect connector from alternator.
- Remove nut and disconnect wire from alternator.
- Disconnect wire clamp from alternator.
- Loosen adjust lock nut, bolt and pivot bolt.
- Loosen adjusting belt, and remove drive belt.
- Remove pivot bolt, adj...
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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Cabin Air Filter Service -> Toyota -> Tundra
Vehicle: 2003 Toyota Tundra 4.7 V8 GAS
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.
- Open the glove compartment door.
- Slide off the glove damper rod, Fig. .
- Push inward on each side of the glove compartment door to disengage claws, Fig. .
- Remove the cabin air filter c...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Toyota -> Automatic Transmission Oil Temperature Warning Lamp ->
Vehicle: 2003 Toyota Tundra 4.7 V8 GAS
This lamp will be illuminated when automatic transmission or transfer case fluid temperature exceeds 302°F. If the lamp lights, allow vehicle to operate at idle speed until fluid temperature falls below 248°F; t...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2003 Toyota Tundra AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 2003 Toyota Tundra 4.7 V8 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 Tundra AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2003 Toyota Tundra 3.4 V6 GAS
- Raise and support vehicle.
- Remove engine under cover.
- Loosen idle pulley lock nut.
- Loosen drive belt tensi...
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COMPONENT LOCATION DIAGRAMS FOR 2003 Toyota Tundra AUTOMOBILES
Component location diagrams for most 2003 Toyota Tundra cars and light trucks sold in the U.S. from 1990+.
![]() Components on diagram: |
![]() Components on diagram: |
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WIRING DIAGRAMS FOR 2003 Toyota Tundra AUTOMOBILES
OEM drawn wiring diagrams for most 2003 Toyota Tundra cars and light trucks sold in the U.S.
![]() Components on diagram: |
![]() Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2003 Toyota Tundra AUTOMOBILES
OEM TSB listings for most 2003 Toyota Tundra cars and light trucks sold in the U.S. from 1985+.
Document: A340 TRANSMISSION SOLENOID IDENTIFICATION Vehicle: 2003 Toyota Tundra 4.7 V8 GAS Auto Systems: |
Document: LONG TERM VEHICLE STORAGE GUIDELINES Vehicle: 2003 Toyota Tundra 4.7 V8 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2003 Toyota Tundra AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2003 Toyota Tundra 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 Tundra 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 Tundra 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 Tundra 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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