Toyota COMPUTER-CONTROLLED SYSTEM

13
ELECTRONIC CONTROL SYSTEM
- Kick-down Switch ,
Water Temp . Switch, Clutch Switc
h
KICK-DOWN SWITCH* WATER TEMPERATUR E
The kick-down switch is fitted to the floor panel
SWITC H
directly under the accelerator pedal
. When the This switch sends signals to the Engine ECU
accelerator pedal is depressed beyond the full when the engine is about to overheat
. When the
throttle opening level, the kick-down switch Engine ECU receives this signal, it controls the
turns on and sends a KD signal to the ECU
. This EFI system and air conditioner cut-off control
KD signal is used for power enrichment
. system in order to lower the fuel combustio n
*This switch is also called the "full throttle
switch" in other manuals .
~- -~
temperature .
ELECTRICAL CIRCUITRY
Engine EC
U
Accelerato
r
e----peda l
Kick-down switch
OHP 3 6
ACCELE-
Kick-dow n
RATOR
switc h
PEDAL
~ .
r
Accelerato
r
ITEM peda
l
THROTTLE Fully Fully Full y
VALVE
closed opened opene d
KICK-DOW
N
SWITCH
Off Off On
OHP 3 6
CLUTCH SWITC H
The clutch switch is located under the clutch
pedal, and is used to detect whether or not the
clutch has been applied
. This signal is used
mainly to control the fuel cut-off engine speed
(See page
78), thereby reducing emissions .
ELECTRICAL CIRCUITRY
Engine EC U
ELECTRICAL CIRCUITRY
Engine ECU
OHP 3 6
OHP 3
6
42