1995 Lexus SC 400FACTORY OEM SERVICE PROCEDURE

Component Locations

COMPONENT LOCATIONS

Component Location
Air Intake Chamber On Top Center Of Engine, Bolted To Intake Manifold
AM2 Fusible Link (30-Amp) Forward Of Left Front Strut Tower, In Fuse/Relay Block
Camshaft Sensors One On Each Distributor Housing
Crankshaft Sensor To Left Of Crankshaft Pulley
Data Link Connector (DLC) No. 1 Near Left Front Corner Of Air Intake Chamber. See Figure
EFI Fuse (30-Amp) . Forward Of Left Front Strut Tower, In Fuse/Relay Block
EFI Main Relay Forward Of Left Front Strut Tower, In Fuse/Relay Block
EGR Temperature Sensor On Left Side Of Air Intake Chamber, On Bottom Of EGR Valve Adapter
EGR Valve On Left Side Of Air Intake Chamber
Engine Control Module (ECM) Under Right Front Floor Mat & Protective Cover
Engine Coolant Temperature (ECT) Sensor On Water Inlet, Where Lower Radiator Hose Is Connected To Engine
EVAP (Charcoal) Canister In Right Rear Corner Of Engine Bay
EVAP Check Valve At End Of Hose That Is Connected To Bottom Of EVAP Canister
EVAP Vacuum Switching Valve (VSV) On Right Side Of Right Cylinder Head, Near Front
Fuel Filter Under Vehicle, Forward Of Left Rear Wheel
Fuel Pressure Pulsation Damper On Rear End Of Left Fuel Rail
Fuel Pressure Regulator On Front End Of Right Fuel Rail
Fuel Pressure Regulator Vacuum Switching Valve (VSV) On Top Of Engine, At Left Front Corner Of Air Intake Chamber
Fuel Pump In Fuel Tank (Pump Is Accessible With Rear Seat Back Removed, But Electrical Connector Is Accessible Through Luggage Compartment)
Fuel Pump Connector In Luggage Compartment, Behind Rear Seat Back
Fuel Pump ECU Under Left Rear Window, Behind Trim Panel (Remove Seat For Access)
Idle Air Control (IAC) Valve On Front End Of Air Intake Chamber
IGN Fuse (7.5-Amp) Behind Left Side Of Instrument Panel, In Fuse Block
Ignitors No. 1 & 2 At Left Front Strut Tower
Ignition Coils One To Left Of Each Distributor
Ignition Main Relay Forward Of Left Front Strut Tower, In Fuse/Relay Block
Intake Air Temperature (IAT) Sensor Part Of Volume Airflow (VAF) Sensor
Knock Sensors Under Intake Manifold, On Top Of Cylinder Block
Oxygen Sensor
Main One In Each Exhaust Manifold
Sub One Downstream Of Each Pre-Catalytic Converter
Park/Neutral Position (PNP) Switch On Left Side Of Transmission, Near Front
PCV Valve On Top Of Left Valve Cover
Starter Relay Forward Of Left Front Strut Tower, In Fuse/Relay Block
ST Fuse (7.5-Amp) Behind Left Side Of Instrument Panel, In Fuse Block
Sub-Throttle Actuator Motor (With TRAC) On Throttle Body. See Figure
Vehicle Speed Sensor (VSS) No. 1 On Right Side Of Transmission (Do Not Confuse With VSS No. 2 On Left Side)
Volume Airflow (VAF) Sensor In Intake Air Hose
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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