Below is a list describing the major difference
between the 3MZ-FE engine on the ’06 Highlander Hybrid and the 3MZ-FE engine on the ’06 Non-Hybrid Highlander:
Engine Proper
•
A PVD (Physical Vapor Deposition) coating has been applied on the surface
of No.1 compression ring.
•
An oil ring with a two-piece shape is used.
•
A wear resistant coating is used on the sliding surfaces of the crankshaft
bearings for the No. 1 and No. 4 journals.
Valve Mechanism
The valve timing has been changed to achieve optimum hybrid control.
Cooling System
The engine radiator and condenser, inverter radiator have been integrated.
Intake and Exhaust System
•
The material of and hoses has been changed to inhibit the permeation of fuel
vapors.
•
An intake air connector made of aluminum alloy is used.
•
To reduce noise, resonators have been added to the following areas: inside
the air cleaner, air cleaner hose, and the air inlet.
•
A material that provides the same level of high-temperature strength as
stainless steel is used for the exhaust manifold.
•
A ceramic catalyst is used.
•
A large, 20.8-liter capacity muffler is used.
Fuel System
A fuel tank close valve and have been discontinued closed tank system are used.
Charging System
The alternator has been discontinued.
Starting System
The starter motor has been discontinued.
The starting system uses a motor generator (MG1).
Engine Mount
The shape of the front and rear engine mounts has been optimized and an
absorber engine mount is used for the rear.
Belt Drive System
The drive belt has been discontinued, along with the used of electric power steering and an electric inverter compressor.
Engine Control System
•
An THS ECU is used with the hybrid system. Furthermore, the THS ECU
have been integrated.
•
The operating range of the VVT-i (Variable Valve Timing-intelligent)
system has been changed.
Evaporative Emission System
The evaporative emission control has been changed, along with the use of a closed tank system.
Diagnosis
The diagnosis communication has been changed from serial communication
(ISO9141) to CAN communication