ELECTRONIC CONTROL SYSTEM - Genera
l
ELECTRONIC CONTROL SYSTE
M
GENERA
L
The engine control system can be divided into
three groups
: sensors (and the signals output by
them), the ECU, and actuators
. This section
describes only the sensor (signal) systems
.
ECU functions are divided into EFI control, ESA
control, ISC control, diagnostic function, fail-safe
function, back-up function and others
. Each of
these functions is covered in a separate section
of this manual
.
Actuator functions are also covered in a
separate section
.
41
1
The following table shows the specifications for
the 4A-FE engine
. Information on sensors (and
their signals) marked with a circle in the
"APPENDIX" column is included in the
specifications for each engine in the APPENDIX
section (page 188) at the back of this manual
.
Sensors (signals) covered in Step 2, vol
.
5 (EFI),
are covered in outline form only in this manual
.
If there is a circle in the "STEP 2(EFI)" column in
the following table, refer to the Step 2, vol
. 5
(EFI), for a detailed explanation of the relevant
sensors (and their signals)
.
SENSORS (SIGNALS)
PAG
E
(THI
S
MANUAL)
ITEM
REMARK
APPENDIX
STEP
2
(EFI
)
Engine
without steppe
r
motor
type ISC valve
15
0
Power circuitry
Engine with steppe
r
motor type ISC valve
1
6
VC circuitry
16
0
Ground circuitry
16
0
Manifold pressure
senso
r
(vacuum sensor)
17
0
Vane type
1
8
Air flow meter
Optcal Karman vorte
x
type
2
1
Hot-wire type
21-
1
Throttle
On-off type
22
position sensor
Linear
type
23
0
In-distributor
type
24
G and
NE signa
l
enerators
Cam position sensor type
27
g
Separate type
28
Water temperature sensor
30
Intake air temperature
sensor
30
Oxygen sensor
Zirconia element type
31
With TW
C
(02
sensor)
Titania element type
3 2
Lean mixture sensor
3 3
` Specifications
for Carolla AE101 4A-FE engine (Apr
., 1992)
(Continued
on next page
)
13
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