ELECTRONIC CONTROL SYSTEM
- Throttle Position Senso
r
THROTTLE
POSITION SENSO
R
The throttle position sensor is mounted on the
throttle body
. This sensor converts the throttle
opening angle to a voltage and sends it to the
Engine ECU as the thro
tt
le opening angle signal
.
The IDL signal is used mainly in fuel cut-off
control and ignition timing corrections and the
VTA or
PSW signal is used mainly for increasing
the fuel injection volume to increase engine
output
.
There are two types of throttle position sensor,
as follows
:
• On-off type
• Linear typ
e
1
. ON-OFF TYP
E
This type of throttle position sensor detects
whether the engine is idling or running under a
heavy load by means of the idle (IDL) contact or
power (PSW) contact
.
Other terminals or contacts can also be used to
perform other functions, depending on the type
of engine. These include
: the lean burn switch
(LSW) contact, for lean burn correction
; the L1,
L2, and L3 terminals for control of the ECT
; the
ACC1 and ACC2 terminals for sensing
acceleration ; etc
. For further details, see Step 2,
vol
. 5 (EFI)
.
1 2-contact type
2 3-contact typ
e
3 With L1, L2 and L3
terminal
s
IDL
4 With ACC1 and ACC2
terminal
s
ACC
2
ELECTRICAL CIRCUITRY (2-CONTACT TYPE
)
PSW ~
E
IDL
IDL H E
On
Of
f
PSW H E ' Off
~
O
n
i
I
Thro
tt
le valve
---)
Open
OHP 14
OHP 1
4
22
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