COMPONENT PARTS
EC-25
< SYSTEM DESCRIPTION >
[HR12DE (TYPE 1)]
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Fuel Pump Control Module (FPCM)
INFOID:0000000005991051
When driving conditions demand a decrease in fuel supply, the fuel
pump control module (FPCM) reduces the supply voltage to the fuel
pump. When driving conditions demand an increase in fuel supply
(during engine start, low engine coolant temperature or high load),
the supply voltage to the fuel pump is increased.
Air Fuel Ratio (A/F) Sensor 1
INFOID:0000000005991052
DESCRIPTION
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of approxi-
mately 800
°
C (1,472
°
F).
A/F SENSOR 1 HEATER
A/F sensor 1 heater is integrated in the sensor.
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element within the specified range.
Heated Oxygen Sensor 2
INFOID:0000000005991053
DESCRIPTION
JSBIA0297ZZ
JMBIA0112GB
PBIB3354E