Construction Of Engine Control - Toyota COMPUTER-CONTROLLED SYSTEM Training Manual

® OUTLINE OF TCCS - System Descriptio n
2 . CONSTRUCTION OF ENGINE CONTROL SYSTE M
BLOCK DIAGRA M
The engine control system can be broadly The sensors and actuators which form the basis
divided into three groups : the sensors, the of an engine control system used in an engine
Engine ECU and the actuators . with an oxygen sensor are shown below .
SENSOR S
MANIFOLD PRESSURE I I I I EF I
SENSOR (D-TYPE EFI )
AIR FLOW METER*2
(L-TYPE EFI )
DISTRIBUTOR
----------------------------
• Crankshaft angle signa l
• Engine speed signa l
WATER TEMP . SENSO R
INTAKE AIR TEMP . SENSO R
THROTTLE POSITION SENSO R
• Idling signa l
• Throttle position signa l
IGNITION SWITCH
(ST TERMINAL )
• Starting signa l
VEHICLE SPEED SENSO R
OXYGEN SENSO R
VARIABLE
RESISTOR- 3
NEUTRAL START SWITC H
TAILLIGHT &
DEFOGGER RELAY S
AIR CONDITIONE R
KNOCK SENSO R
CHECK CONNECTOR
OXYGEN SENSOR HEATER
CONTRO L
OXYGEN SENSOR HEATE R
FUEL PUMP CONTRO L
CIRCUIT OPENING RELA Y
CHECK ENGINE LAMP
(Diagnostic code display )
PIM ~10
VS, KS
#20
or VG
G
N E
TH W
TH A
ID L
T A
ST A
SP D
OX
VA F
NS W
EL S
A/ C
KN K
T E
TE
IG T
IG F
IS C
RSC
ENGINE IRSO I
ECU
H T
F C
W
BATT I 1
+13
BATTERY I I EFI MAIN RELA Y
*
1
* 2
*3
Actuators only related profoundly to the engine control are shown here .
Although a D-type EFI is shown in the above figure and a L-type EFI sensor is also shown for reference .
Applicable only to General Country specification vehicles without oxygen sensor .
ACTUATORS* '
NO .1 AND 3 INJECTOR S
NO .2 AND 4 INJECTOR S
ES A
IGNITE R
i
IGNITION COI L
i
DISTRIBUTO R
t
SPARK PLUG S
IS C
IDLE SPEED CONTROL VALV E
COROLLA 4A-FE ENGINE FOR EUROPE ( Apr ., 1992)
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