Engine Controls - Removal, Overhaul & Installation: Other Lexus LS III

INTAKE AIR CONTROL VALVE

Note. Intake Air Control (IAC) valve is used on Acoustic Control Induction System (ACIS).

INTAKE AIR CONTROL VALVE VACUUM SWITCHING VALVE

Note. Intake air control valve VSV may also be referred to as Acoustic Control Induction System (ACIS) vacuum switching valve.

ENGINE CONTROL MODULE (ECM)

AIR/FUEL RATIO (A/F) SENSOR

Note. Air/Fuel Ratio (A/F) sensor may also be referred to as Air/Fuel (A/F) sensor.

HEATED OXYGEN SENSOR

Note. Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block. Sensor No. 2 refers to sensor farthest away from engine block.

FUEL SYSTEM

Scheme 51

1. On ES300, IS300, GS300, GS430 and LS430, remove rear seat cushion and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit. Go to step 4.
2. On LX470, disconnect electrical connector for fuel pump. (Scheme 51) This is electrical connector for fuel pump and fuel gauge sending unit. Go to step 4.
3. On RX300, remove driver's side rear seat. Remove carpet and cover plate on floor panel for access to electrical connector for fuel pump. Disconnect electrical connector for fuel pump. This is electrical connector for fuel pump and fuel gauge sending unit, and is located on top of fuel tank, near fuel pump. Go to next step.
4. On all models, start engine and allow engine to idle until engine stalls. Turn ignition off. Reinstall electrical connector for fuel pump and any removed components.
5. Disconnect negative battery cable. Place suitable container under fuel line connection. Cover fuel line connection with shop towel. Slowly loosen fuel line connection, allowing any fuel pressure to be released. Once fuel pressure is released, fuel system components may be serviced.

GS300, IS300, GS430 & LX470

1. Ensure fuel line connector is clean. Disconnect fuel line connector as illustrated. (Scheme 52) If connector and line are stuck, pinch retainer, push and pull connector to free. DO NOT use tools to disconnect connector. After disconnecting, ensure seal surface is clean. Cover connector with plastic to prevent damage.
2. When removing retainer from fuel line, replace with new one. Apply small amount of engine oil to fuel line tip for easier installation. Push connector and retainer together until a click sound is heard. Ensure connection is secure by pulling on connector. Start engine and check for leaks.

Scheme 52

FUEL PRESSURE REGULATOR

Note. All models except LX470 use a returnless fuel system. Fuel pressure regulator is mounted to fuel pump assembly and is located in fuel tank. LX470 uses a fuel return system with fuel pressure regulator mounted on fuel rail.

FUEL PUMP SWITCH

Note. Fuel pump switch may also be referred to as fuel pump inertia switch or fuel pump control switch.

ES300 & RX300

If IAC valve replacement is necessary, remove throttle body. See THROTTLE BODY .

CHARCOAL CANISTER

Note. Charcoal canister is also referred to as EVAP canister.

VARIABLE VALVE TIMING (VVT) INTAKE CAMSHAFT PULLEY

Note. Variable valve timing (vvt) intake camshaft pulley may also be known as camshaft timing pulley.

For removal procedure of variable valve timing intake camshaft pulley, see step 8 under REMOVAL . For installation procedure of variable valve timing intake camshaft pulley, see step 6 under INSTALLATION .

VARIABLE VALVE TIMING (VVT) SENSOR

Note. GS300 and IS300 models are equipped with variable valve timing but use the camshaft position sensor instead of Variable Valve Timing (VVT) sensors to determine camshaft position. See CAMSHAFT POSITION SENSOR under IGNITION SYSTEM.

TORQUE SPECIFICATIONS (ES300 & RX300)

GS300, IS300, GS430, LS430 & LX470

TORQUE SPECIFICATIONS (GS300, IS300, GS430, LS430 & LX470)