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Engine Controls - Remove/install/overhaul: Other Lexus GS II

Removal & Installation 2 illustrations ~320 words

HEATED OXYGEN SENSOR

Note. ES300 is equipped with 3 sensors. All other models are equipped with 4 sensors. 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.

MASS AIR FLOW (MAF) SENSOR

Note. On ES300, install NEW gasket during MAF sensor installation.

FUEL SYSTEM

WARNINGAlways relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components.

FUEL SYSTEM PRESSURE RELEASE

  1. Disconnect electrical connector from fuel pump. Fuel pump is located in the fuel tank. Start engine and allow engine to idle until engine stalls. Turn ignition off. Disconnect negative battery cable.
  2. Place suitable container under any easily accessible fuel line connection. Cover fuel line connection with shop towel. Slowly loosen fuel line connection, allowing fuel pressure to be released. If disconnecting quick connector, see «FUEL LINE QUICK CONNECTOR»(ref-22518-S20359934662001010300000) . Once fuel pressure is released, fuel system components may be serviced.

ES300, GS300, GS400

  1. Ensure line connector is clean. Disconnect fuel line connector as illustrated. (Scheme 37)or (Scheme 38). 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 37

Scheme 37
Scheme 37

Scheme 38

Scheme 38
Scheme 38

IDLE AIR CONTROL (IAC) VALVE

Note. On ES300, when removing IAC valve, remove throttle body first. See THROTTLE BODY . When reinstalling IAC valve, install NEW gasket.

VARIABLE VALVE TIMING (VVT) INTAKE CAMSHAFT PULLEY

For removal and installation procedure of variable valve timing intake camshaft pulley, see ENGINES article.

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