LX470 — NEW FEATURES 11 3. Major Difference System Outline Engine Specification (See page 9) According to various changes, the following specifications are changed. • Valve Mechanism • Compression Ratio • Intake Valve Timing • Max. Output and Torque • Engine Service Mass Engine Proper Cylinder Head (See page 12) • A lead-free valve seat is used. • The passage for the air injection is added. Cylinder Block (See page 12) • A lead-free crankshaft bearing is used. • Oil jet for piston is added. Piston Piston shape is changed. Connecting Rod A lead-free connecting rod bearing is used. Valve Mechanism (See page 14) Intake camshaft for the VVT-i (Variable Valve Timing-intelligent) is used.
Lubrication (See page 15) Oil passage for the VVT-i and oil jet for the piston is added. Intake and Exhaust (See page 16) • A charcoal filter is used in the air cleaner cap. • The throttle body shape is changed. • The material of the intake manifold is changed from aluminum to plastic. • The air injection pipe is provided on the exhaust manifold. • The capacities of two TWCs (Three-Way catalytic Converters) on the front exhaust pipe are increased for exhaust gas purification. Fuel • The construction of the fuel pump is changed. • The construction of the evaporative emission control system is changed. For details, see page 42.
Engine Control Main Component • Mass air flow meter is changed from the plug-in type to the slot-in type. For details, see page 26. • Camshaft position sensor is changed from the pick-up type to the magnetic resistance element type. For details, see page 27. • Two VVT-i sensors are added. For details, see page 27. • Knock sensor is changed from the resonant type to the non-resonant type. For details, see page 28. • Two air fuel ratio sensors are used. For details, see page 30. Control • VVT-i control is added. For details, see page 31. • ACIS (Acoustic Control Induction System) control is added. For details, see page 35. • Air injection control is added. For details, see page 37.
• DTCs (Diagnostic Trouble Codes) are added and discontinued. For details, see page 54. • The diagnosis communication is changed from serial communication to CAN (Controller Area Network) communication. As a result, a dedicated adapter [CAN-VIM (Vehicle Interface Module)] must be attached to the conventional hand-held tester in order to read the DTC of the ECM. For details, see the 2006 LEXUS LX470 Repair Manual (Pub. No. RM0030U).