Honda ACCORD HYBRID 2005 Service Manual page 277

Secondary Heated Oxygen Sensor (Secondary H02S)
The secondary H 0 2 S detects the oxygen content in the
exhaust gas d o w n s t r e a m of the w a r m up three w a y
catalytic converter (WU-TWC), and sends signals to the
PCM. To stabilize its output, the sensor has an internal
heater. The PCM compares the H 0 2 S output w i t h the
A/F sensor output to determine catalyst efficiency. The
secondary H02S is on the WU-TWC.
, ZIRCOIMIA
E L E M E N T
S E N S O R
T E R M I N A L S
HEATER
HEATER
T E R M I N A L S
Electronic Throttle Control System
The throttle is electronically controlled by the electronic
throttle control system. Refer to the System Diagram to
see a functional layout of the system.
Idle control: W h e n the engine is idling, the PCM
controls the-throttle actuator to maintain the proper idle
speed according to engine loads.
Acceleration control: W h e n the accelerator pedal is
pressed, the PCM opens the throttle valve depending
on the accelerator pedal position (APP) sensor signal.
Cruise control: The PCM controls the throttle actuator to
maintain set speed w h e n the cruise control is operating.
The throttle actuator takes the place of the cruise
control actuator.
Accelerator Pedal Position (APP) Sensor
As the accelerator pedal position changes, the sensor
varies the signal voltage to the PCM.
A P P S E N S O R A / B
B R U S H
TERMINAL
L E V E R
Throttle Body
The throttle body is a single-barrel side draft type. The
lower portion of the throttle valve is heated by engine
coolant f r o m the cylinder head to prevent icing of the
throttle plate.
T H R O T T L E V A L V E
T H R O T T L E POSITION
(TP) S E N S O R A / B and
T H R O T T L E A C T U A T O R
(cont'd)
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