2001 TOYOTA PRIUS tire type

ENGINE ± 1NZ-FXE ENGINE
171EG13
Spring
Plunger
Cam
Cam Spring Check Ball
171EG32171EG31
Service Hole for
Chain Tensioner
Oil Pump
Front ViewBack View51
5. Chain Tensioner
The chain tensioner uses a spring and oil pres-
sure to maintain proper chain tension at all
times.
The chain tensioner suppresses noise generated
by the chain.
A ratchet type half-back mechanism is used.
6. Timing Chain Cover
A single-piece, aluminum die-cast timing chain cover that entirely seals the front portion of the cylinder
block and the cylinder head has been adopted.
A service hole for the chain tensioner has been provided in the timing chain cover to improve serviceabili-
ty.

ENGINE ± 1NZ-FXE ENGINE
150EG39150EG40
Close
Open
VC VTA1 VTA2 E2V
5
0 Close
Output Voltage
Open VTA1 VTA2
Accelerator Pedal Depressed Angle75
2) Throttle Position Sensor
The throttle position sensor is mounted on the throttle body.
The throttle position sensor converts the amount of accelerator pedal effort into two types of electrical
signals with distinct output characteristics. The signals are then input into the ECM.
3) Throttle Control Motor
A DC motor with excellent response and minimal power consumption is used for the throttle control mo-
tor. The ECM performs the duty ratio control of the direction and the amperage of the current that flows
to the throttle control motor in order to regulate the opening angle of the throttle valve.
Operation
The ECM drives the throttle control motor by determining the target throttle valve opening in accordance
with the respective operating condition.
1) Idle Speed Control
The idle speed control is effected entirely by the ETCS-i. The following are the contents of the control:
idle-up control during cold engine operation, intake air volume control to improve the startability of the
engine, and control for when the electrical load changes such as when the air conditioning switch is turned
ON or OFF.
2) Cruise Control
Through the adoption of the ETCS-i, the vehicle speed is now controlled by the throttle control motor,
which controls the throttle valve.

CHASSIS ± SUSPENSION AND AXLES
NOTICE
Be sure to use the jack-up points that are provided on the body when raising the vehicle on a jack. Never
apply a jack under the axle beam, training arm, or the bushing of the rear suspension.
182CH34
Never use these areas
as jack-up points. 96
3. Rear Suspension
General

A torsion beam type suspension with toe control links has been adopted, in which an axle beam is located
in the middle of the trailing arm.

The torsion beam type rear suspension minimizing change in the tire-to-road camber during cornering,
thus delivering good cornering stability and driving stability.

The stabilizer bar has been adopted to realize excellent drivability and stability.

A toe control link mechanism has been adopted in the construction of the trailing arm bushings. The toe-
correct function that is effected by the movement of the links results in optimal compliance steering, thus
achieving excellent drivability, stability, and riding comfort at high levels.