Honda Accord 2008 Manual page 354

07/11/02 09:00:44 61TA0000_110_0035
Output Shaft (Countershaft) Speed Sensor
This sensor detects countershaft speed.
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Secondary Heated Oxygen Sensor (Secondary HO2S)
The secondary HO2S detects the oxygen content in the
exhaust gas downstream of the warm up three way
catalytic converter (WU-TWC), and sends signals to the
ECM/PCM which varies the duration of fuel injection
accordingly. To stabilize its output, the sensor has an
internal heater. The ECM/PCM compares the HO2S
output with the A/F sensor output to determine catalyst
efficiency. The secondary HO2S is installed
downstream of the WU-TWC.
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ZIRCONIA
ELEMENT
TERMINAL TERMINAL
MAGNET
O-RINGS
M/T model shown
SENSOR
TERMINALS
HEATER
HEATER
TERMINALS
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: When the engine is idling, the ECM/PCM
controls the throttle actuator to maintain the proper idle
speed according to engine loads.
Acceleration control: When the accelerator pedal is
pressed, the ECM/PCM opens the throttle valve
depending on the accelerator pedal position (APP)
sensor signal.
Cruise control: The ECM/PCM controls the throttle
actuator to maintain set speed when 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 ECM/PCM.
APP SENSOR A/B
ACCELERATOR
PEDAL MODULE
(cont'd)
11-35
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