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14-10
FUEL SYSTEM - Sensors
Eogine
oontrol LJf' 1 ;!
CHANGEOVER SWITCH
Muffler modo
o~w
r
.wiIch
When the driver turns the muifler mode changeover
switch
on, the engine contro
l
unit reduces exhaust
noise
~o
r
improved
quiet
ness (Tour model. On the other hand, when
the driver t urns
the
changeover
switch
off. the engine control
unit reduces exhaust gas resistance to
improve
the
acceleratio
n
feeling ISport
model.
TWIN OXYGEN SENSOR
There are sub catalysts in both the front and rea
r
ban~s
in the
DOHC turbo engine.
In
order 10 maintain the proper ai rlfuel ratio in both banks,
there is
an oxygen sensor for each one before the catalyst
of
both banks 10
enable
feedback
control
of
tna air/fue
l
ratio for
each bank separately.
Each oxygen sensor is the same as the convent
ioMI
oxygen
sensor with heater.
POWER TRANSISTOR UNIT IENGINE IGNJnON
SIGNAl)
Power
supply
(from
il/n ition
'
wilchi
P(>NtIr
tronsi.,,,, oo
it
Engine
control
ooit
,",
•
J
,",
,
(
!
,
,",
J
•
,
•
,
!
""'
~
"
0
H~JLJJ
To
tacoomel.
r
" "0'"
The generation condition of the eng ine ignition
signal is detected.
If
there is an abnormality
during
driving such that
no
ignition
signa
l
is
generated at the ignition
timing. the
engine control
unit puts
in
memory the
relevant diagnosis code (No. 441
_
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