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1994 Lexus LS400 CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT Lexus REPAIR SHOPS DON'T WANT YOU TO KNOW
Learn how to repair a car or truck, install or remove parts, wire an engine, reset warning lights, replace fuel filter, fix auto body and more. Get Automotix DIY!Select Section
- 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
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1994 Lexus LS400 car and truck
repair procedures including Lexus engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your Lexus LS400 automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Lexus -> Diagnosis & Testing -> A/C SYSTEM TROUBLESHOOTING -> DIAGNOSTIC CODE NOT RECORDED, SET MODE IS CLEARED WHEN IGNITION SWITCH IS TURNED OFF -> ENGINE IDLE UP DOES NOT OCCUR, OR IS CONTINUOUS -> ES 300, GS 300, SC 300 & SC 400 -> INSUFFICIENT AIR FLOW -> LS 400 -> NO AIR FLOW MODE CONTROL -> NO AIR INLET CONTROL -> NO BLOWER CONTROL -> NO BLOWER OPERATION -> NO COOL AIR COMES OUT -> NO TEMPERATURE CONTROL (ONLY MAXIMUM COOL OR MAXIMUM WARM) -> NO WARM AIR COMES OUT -> OUTPUT AIR IS WARMER OR COLDER THAN THE SET TEMPERATURE OR RESPONSE IS SLOW
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
NO BLOWER OPERATION
- Inspect IG power source circuit.
- Inspect Accessory power circuit.
- Inspect heater main relay circuit.
- Inspect blower motor circuit.
- Inspect water temperature sensor circuit.
- Inspect Electronic Control Unit (ECU).
NO BLOWER CONTROL
- Inspect IG power source circuit.
- Inspect power transistor circuit.
- On ES 300 and LS 400 models, inspect EX-Hi relay circuit.
- On all models, inspect heater main relay circuit.
- Inspect blower motor circuit.
- On GS 300 and LS 400 models, inspe...
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BRAKE SERVICE PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Anti-lock Brakes -> System Service -> ABS Actuator -> Brake System Bleed -> Component Replacement -> GS300 -> LS400 -> SC300 & SC400 -> Speed Sensors
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
Brake System Bleed
Refer to "Hydraulic Brake Systems" for bleeding the ABS brake system.
Component Replacement
ABS Actuator
GS300
Refer to Fig. for actuator replacement procedure, noting the following:
- Drain high pressure fluid as outlined under "Hydraulic Brake Systems."
- Using brake tube union nut wrench tool No. 09751-36011, or equivalent, disconnect the brake tubes from actuator.
- Reverse procedure to install. Bleed brake and TRAC system as described under "Hydraulic Brake Systems."
LS400
Refer to Figs. and when replacing the actuator, noting ...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Lexus -> Fuel Filter Replacement -> 1993-97 LS400, SC300, SC400 & GS300 -> Fuel System Pressure Relief -> Removal & Installation
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
Fuel System Pressure Relief
- Obtain the vehicle owners radio theft protection code prior to disconnecting the battery ground cable, if equipped.
- From the luggage compartment, remove the luggage compartment floor mat and trim cover.
- Disconnect the fuel pump electrical connector, Figs. through .
- Start the engine and allow to idle until it stalls.
- Place the ignition switch in the Lock position.
- Disconnect the battery ground cable.
- Connect the fuel pump electrical connector.
- Install the luggage compartment trim cover and floor mat.
Removal & Installation
Do not smoke or al...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
CV AXLE SHAFT, Replace
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
- Raise and support vehicle, then remove wheel and tire assemblies.
- Remove cotter pin, locknut cap and locknut, Fig. .
- When removing right side driveshaft, it will be necessary to remove the O-ring style exhaust hangers and support tail pipe with wire.
- On models with air suspension, disconnect height control sensor and remove both mounting bolts, then support with wire, Fig. .
- On all models, place alignment marks on driveshaft and side gear shaft with a marking pencil, Fig. ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Alternator, Replace
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
- Remove battery clamp cover.
- Remove air cleaner inlet.
- Loosen belt tension by turning belt tensioner counterclockwise, and remove drive belt. The pulley bolt for belt tensioner has a lefthand thread.
- Remove oil pan protector.
- Remove engine under cover.
- Disconnect power steering oil cooler pipe from oil pan.
- Disconnect alternator connector.
- Remov...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Lexus -> Malfunction Indicator Lamp (MIL) ->
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
On some models equipped with OBD II, the MIL will also illuminate if the fuel tank filler cap is not properly tightened. Tighten fuel tank filler cap until it clicks.
On some models equipped with OBD II, if a misfire condition which may cause damage to the catalytic converter is present, the Check engine lamp will flash once per second until vehicle operation is outside the speed and load range causing the misfire. The lamp will stop flashing and remain steady
On all models, the MIL should light when the ignition switch is placed in the On position without starting the engine. When the engine is...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Radiator, Replace
Vehicle: 1994 Lexus LS400 4.0 V8 GAS
- Disconnect battery ground cable.
- Remove engine undercover.
- Drain engine oil into suitable container, then remove battery clamp cover.
- Remove air cleaner cover, then the air cleaner hose.
- Remove air cleaner inlet.
- Disconnect upper radiator, reservoir tank inlet, lower radiator and oil cooler hoses from radiator. Plug hose ends to prevent contamination.
- Remove No. 2 fan shroud clips, then disconnect No. 2 s...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1994 Lexus LS400 AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1994 Lexus LS400 4.0 V8 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 1994 Lexus LS400 AUTOMOBILES
Component location diagrams for most 1994 Lexus LS400 cars and light trucks sold in the U.S. from 1990+.
 Cruise Control System Components Diagram for 1994 Lexus LS400 4.0 V8 GASComponents on diagram: |
 Engine Compartment Connectors (I1 Thru W5) Diagram for 1994 Lexus LS400 4.0 V8 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1994 Lexus LS400 AUTOMOBILES
OEM drawn wiring diagrams for most 1994 Lexus LS400 cars and light trucks sold in the U.S.
 1994 Lexus LS400 4.0 V8 GAS Wiring DiagramComponents on diagram: |
 1994 Lexus LS400 4.0 V8 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1994 Lexus LS400 AUTOMOBILES
OEM TSB listings for most 1994 Lexus LS400 cars and light trucks sold in the U.S. from 1985+.
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Document: PERMANENT-TYPE PROTECTIVE WAX COATINGS Vehicle: 1994 Lexus LS400 4.0 V8 GAS Auto Systems: |
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Document: REPLACEMENT CERTIFICATION LABELS - REVISED Vehicle: 1994 Lexus LS400 4.0 V8 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1994 Lexus LS400 AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1994 Lexus LS400 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 1994 Lexus LS400 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 1994 Lexus LS400 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 1994 Lexus LS400 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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