Toyota COMPUTER-CONTROLLED SYSTEM User Manual

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

Toyota COMPUTER-CONTROLLED SYSTEM Specifications

General

Brand	Toyota
Model	COMPUTER-CONTROLLED SYSTEM
Category	Automobile Accessories
Language	English