System Description - Toyota COMPUTER-CONTROLLED SYSTEM Training Manual

OUTLINE OF TCCS - System Descriptio n
SYSTEM DESCRIPTIO N
The functions of the engine control system In addition, there are auxiliary engine control
include EFI, ESA, and ISC, which control basic devices on the engine, such as the OD cut-off con-
engine performance ; a diagnostic function, trol system, intake air control system, and others .
which is useful when repairs are made ; and fail- These functions are all controlled by the Engine
safe and back-up functions, which operate when ECU .
any of these control systems malfunction .
Manifold pressure
sensor
Fuel pum p
Knock senso r
Distributor
,(
and
igniter
Water temp . sensor
"E
Ignition switc h
Circuit opening relay
Engine EC U
Variable resistor '
Check connecto r
Idle speed control
valv e
Intake air temp . senso r
"Applicable only to General Country specification vehicles without oxygen sensor .
LAYOUT OF ENGINE CONTROL SYSTEM COMPONENTS
(COROLLA 4A-FE ENGINE FOR EUROPE Apr ., 1992)
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