Materipelatihan 2. Electronic control System.ppt

efi

1. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Description Description
(1/1)
Sensor
Sensor
Sensor
Engine ECU
Actuator
Actuator
Actuator
Engine ECU
EFI ESA ISC
Diagnosis
Fail-safe
& backup
Other
function
Other
function

2. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Power Circuitry
(1/3)
Engine ECU
EFI BATT
+B
+B1*
E1
Ignition
switch
EFI
main
relay
* Some models only
1.Control by ignition switch/
2.Control by engine ECU
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3. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Power Circuitry
(2/3)
1.Control by ignition switch

4. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Power Circuitry
(3/3)
Ignition
switch
IGSW
Engine ECU
EFI BATT
+B
M-REL
E1
A/F HTR relay
EFI
main relay
Key
unlock
warning
switch
Air-fuel ratio sensors
2.Control by engine ECU
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5. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Ground Circuitry
(1/1)
Engine ECU
Sensors
Actuators
+B
+B
E2
E21
E1
E01
E02
1.Ground for engine ECU
operation (E1)/
2.Sensor grounds (E2, E21)/
3.Grounds for actuator
operation (E01, E02)
Engine ECU
Sensors
Actuators
+B
+B
E2
E1
E01
Engine ground
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6. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Sensor Terminal Voltage
(1/1)
ECU
BATT
+B
Throttle position
sensor
VC
0-5V
5V 5V
E2
E1
Constant-voltage
circuit
Microprocessor
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7. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Sensor Terminal Voltage
(1/1)
ECU
Sensor
(Thermistor)
R
E2
E1
Constant-voltage
circuit
Microprocessor
A
5V
2. Using a
thermistor (THW,
THA)
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8. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Sensor Terminal Voltage
(1/1)
ECU
(Transistor
used)
5V Constant-voltage
circuit
Microprocessor
(Switch
used)
Sensors

9. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Sensor Terminal Voltage
(1/1)
ECU
Stop lamp
switch
Microprocessor
Stop lamp

10. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Preliminary Knowledge Sensor Terminal Voltage
(1/1)
ECU
Pickup coil
Microprocessor

11. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Air Flow Meter
(1/5)
Hot-wire type
from Air cleaner
to Air intake
chamber
Mass air flow
meter: Hot-wire
type

12. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Air Flow Meter
(2/5)
Thermistor
Platinum hot-wire
Air flow
Intake air
temp. sensor
1.Hot-wire type

13. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Air Flow Meter
(3/5)
Current
Intake air
Cool
Hot-wire (heater)*
*Constant temperature
5V
O
u
t
p
u
t

v
o
lt
a
g
e

(
V
G
)

Intake air mass (g/sec.)0

14. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Air Flow Meter
(4/5)
Air flow meter
Operation
amplifier
Ra
(thermistor)Rh (hot-wire;heater)
Air
R3
A B
R2
R1
VG
VG
Engine ECU

15. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Air Flow Meter
(5/5)
Air flow meter
Operation
amplifier
Ra
(thermistor)Rh (hot-wire;heater)
Air
R3
A B
R2
R1
VG
VG
Engine ECU
0C+T
20C+T
0C+
20C+
V
VIntake air temp.
Hot-wire (Rh) temp.

16. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
Manifold Pressure Sensor (Vacuum
Sensor)
(1/1)
Vacuum chamber
Silicon chipManifold
pressure sensorEngine ECU
VC
PIM
E2
E1
to Intake manifold
Silicon chip
Filter
Intake manifold pressure
(V)
4
3
2
1
O
u
t
p
u
t

v
o
lt
a
g
e

(
P
I
M
)
020 60 100kPa
(760)(610) (310) (10)(mmHg
[Vacuum])Intake manifold pressure
(absolute pressure)
5V
R

17. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Throttle Position Sensor
(1/2)
Throttle body
Linear type
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18. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Throttle Position Sensor
(2/2)
Slider (contact
for IDL signal)
Closed
Open
Resistor
Slider (contact
for VTA signal)
Throttle position
sensor
E2
IDL
VTA
VC
IDL
VTA
VC
E2
Engine ECU
5V
+B
E1
to other ECU (s)
512
O
u
t
p
u
t

v
o
lt
a
g
e

(
V
)
Idling Fully open
Closed
Throttle
valve Open
I
D
L

o
u
t
p
u
t
VTA output
1.Linear type
(Open)
(Closed)
5

19. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Accelerator Pedal Position Sensor
(1/1)
Accelerator pedal
position sensor
Sensor
operational
range
Pedal
operational
range
Full open
Full
close
Full close
Full
open
Sensor
operational
range
Pedal
operational
range
EP2 VPA2VCP2EP1VPA VCP1
O
u
t
p
u
t

v
o
lt
a
g
e
5V
0 Fully
open
Fully
close
Accelerator pedal depressed angle
VPA2
VPA
1.Linear type

20. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals G and NE Signal Generators
(1/3)
Crankshaft position sensor
Camshaft position sensor
Crankshaft position sensor Camshaft position sensor
REFERENCE:
In-distributor Type

21. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals G and NE Signal Generators
(2/3)
1.Camshaft position sensor
(G signal generator)
Engine ECU
G22
G22
NE
NE
E1
G
NE
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22. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
G and NE Signal Generators
(3/3)
2.The crankshaft position
sensor (NE signal generator)
Engine ECU
G22
G22
NE
NE
E1
G
NE
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23. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
Water Temperature Sensor/
Intake Air Temperature Sensor
(1/1)
Water temperature sensor
Thermistor
40
20
8
10
0.8
6
4
2
0.6
0.4
0.2
-20020406080100120
(-4)(32)(68)(104)(140)(176)(212)(248)
Temperature C(F)
THW
(THA)E2
E2
E1
THW
(THA)
Water temperature sensor
(Intake air temperature sensor)
Engine ECU
5V
1
R
e
s
is
t
a
n
c
e

(
k

)
Return to previous page

24. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
(1/1)
Water Temperature Sensor/
Intake Air Temperature Sensor
Water temperature sensor
Thermistor
40
20
8
10
0.8
6
4
2
0.6
0.4
0.2
-20020406080100120
(-4)(32)(68)(104)(140)(176)(212)(248)
Temperature C(F)
THW
(THA)E2
E2
E1
THW
(THA)
Water temperature sensor
(Intake air temperature sensor)
Engine ECU
5V
1
R
e
s
is
t
a
n
c
e

(
k

)

25. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
(1/1)
Water Temperature Sensor/
Intake Air Temperature Sensor
Water temperature sensor
Thermistor
40
20
8
10
0.8
6
4
2
0.6
0.4
0.2
-20020406080100120
(-4)(32)(68)(104)(140)(176)(212)(248)
Temperature C(F)
THW
(THA)E2
E2
E1
THW
(THA)
Water temperature sensor
(Intake air temperature sensor)
Engine ECU
5V
1
R
e
s
is
t
a
n
c
e

(
k

)

26. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Oxygen Sensor (O
2
Sensor)
(1/1)
Protective
cover
Ambient air
Exhaust gas
Flange
Platinum
Zirconia element
Platinum
Theoretical air-fuel ratio
O
u
t
p
u
t

v
o
lt
a
g
e

(
V
)
1
0
No air into
exhaust
gas
Richer Leaner
Much air
into
exhaust
gas
Air-fuel ratio
Oxygen
sensor
OX
E1
ECU
0.45V5V
R

27. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Vehicle Speed Sensor
(1/2)
Transmission
output shaft
Driven gear
Speed sensor
HIC (with built-in MRE)
Magnetic rings
1.MRE type
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28. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Vehicle Speed Sensor
(2/2)
20-Pole type speed sensor
1
Constant voltage circuit
+B
to
Combination
meter
2
3
4 Magnetic
ting
MRE

Comparator
Magnetic ring (rotating) N

S

S

2
4
MRE output
Comparator output
Speed sensor output
1
0
12V
0V
Output voltage type
Speed
sensor
Combination
meter
SPD
to other
ECU(s)
ECU
5V
Variable resistance type
Speed
sensor
SPD
to other
ECU(s)
ECU
5V
5V
or 12V

29. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Knock Sensor
(1/1)
Knock sensor
to Engine ECU
With Open/short
circuit detection type
KNK1
EKNK
Piezoelectric
element
Resistor
5 msec./Division
Frequency
KNK signal waveforms
5V

30. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
STA (Starter) Signal /
NSW (Neutral Start Switch) Signal
(1/1)
STA signal electrical circuitry
Ignition
switch
ST
(M/T)
Neutral
start
switch
(A/T)
Starter
M
STA
E1
Engine ECU
NSW signal electrical circuitry
Ignition
switch Neutral start switch
Circuit
opening
relay,
etc.
Starter
M
STA
NSW
+B
Engine ECU

31. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals
A/C (Air Conditioner) Signal /
Electrical Load Signal
(1/1)
A/C signal electrical circuitry
Engine ECU
A/C
A/C
magnetic
clutch
A/C
A/C
amplifier
A/C
switch
Electrical load signal electrical circuitry
Taillight relay
to Taillight control
switch
Engine ECU
Taillight
ELS
Rear
window
defogger
Rear window
defogger SW
Engine ECU

32. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Variable Resistor
(1/1)
Connector
Idle mixture adjusting screw
L: Lean side
R: Rich side
Idle mixture
adjusting
screw
Resistor
Engine ECU
Connector
Variable
resistor
Idle mixture
adjusting screw
VC
VAF
E2
E1
5V
Rich
Lean

33. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Communication Signals
(1/1)
1.ABS (Anti-Lock Brake System) communication
signal
2.Engine speed signal
3.Engine immobilizer system communication signal
4.Throttle opening angle signal
5.Multiplex communication system communication
signals

34. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Others
(1/1)
1. Stop lamp switch
+B
Stop lamp
switch
STP or BRK
Lamp failure
relay*
Stop
lamps
*Some vehicle models only
Engine ECU
1.Stop lamp switch

35. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Diagnostic Terminal
(1/1)
SIO

36. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System

37. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals Hall Effect
(1/1)

38. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Sensor and Signals In-distributor Type
(1/1)
G signal timing rotor
NE signal timing rotor
NE pickup coil
Distributor
shaft
NE pickup coil
G signal timing
rotor
G pickup coil
1 turn of timing rotor
180CA (crankshaft angle)
G signal
NE signal
1/2 turn of timing rotor
30CA
(Former model)

39. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Exercise
Use the Exercises to check your level of understanding
for the material in this Section. After answering each
Exercise, you can use the reference button to check the
pages related to the current question. When you get a
incorrect answer, please return to the text to review the
material and find the correct answer. When all
questions have been answered correctly, you can go to
the next Section.
Section Next Section

40. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Question- 1
The following statements pertain to the electric circuit of the engine
control system. Mark each of statement True or False.
No. Question
True or
False
Refer
to page
1
The power supply terminal (BAT) of the power circuitry
aims to the back-up circuit of power supply circuit
when the power supply circuitry is abnormal.
TrueFalse
2
Depending on models, the battery supplies the power
to the engine ECU for a while even if the ignition
switch is turned off.
TrueFalse
3
Grounds of all sensors and actuators are grounded the
body nearby the parts.
TrueFalse
4
The VC terminal supplies 5 V of constant voltage
which is generated in the constant power supply in the
engine ECU as a sensor's power source.
TrueFalse
5
All sensors have a power circuit from the engine ECU
or battery to operate.
TrueFalse

41. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Question- 2
1
The throttle position sensor outputs the VTA signal step by step in accordance
with the throttle opening angle.
2
For the throttle position sensor without an IDL contact, the engine ECU uses the
VTA signal to perform learned control and detect idling condition.
3
For the throttle position sensor without an IDL contact, the engine ECU receives
the IDL signal from other ECUs to control.
4
For the throttle position sensor without an IDL contact, the engine ECU
determines 0 V position of the VTA signal as the idling condition.
The following statements pertain to the throttle position sensor. Select
the statement that is True.
Refer to page

42. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Question- 3
The following statements pertain to the G and NE signal generator.
Mark each of statements True or False.
No. Question
True or
False
Refer
to page
1
The G signal is sent to the engine ECU as the
standard crankshaft angle information.
TrueFalse
2
The NE signal is sent to the engine ECU as the engine
speed signal.
TrueFalse
3
The engine can continue running substituting the G
signal even if the NE signal stops.
TrueFalse
4
When G signal stops, diagnosis code is memorialized
and at the same time, camshaft sensor output used
predetermined value in ECU.
TrueFalse

43. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Question- 4
The following statements pertain to the water temperature sensor and
intake air temperature sensor. Select the statement that is True.
1
The water temperature sensor is turned on when the coolant temperature
becomes high.
2The intake air temperature sensor measures the density of the intake air.
3
When the circuit of the built-in thermistor opens, the sensor terminal voltage in
the engine ECU becomes 0 V.
4
As the coolant or intake air temperature are low, the sensor terminal voltage in
the engine ECU becomes high. Conversely, the sensor terminal voltage
becomes low as temperature are high.
Refer to page

44. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
Question- 5
The following statements pertain to the speed sensor. Select the
statement that is True.
1The speed sensor measures the crankshaft rotational speed of the engine.
2
In the MRE type speed sensor, the SPD signal is converted into the digital
signal in the combination meter.
3
Some vehicle models use the SPD signal of the ABS ECU or AT ECU as the
speed signal.
4
The speed signal goes through the combination meter surely to operate the
speedometer.
Refer to page

45. Diagnosis Technician >> Gasoline Engine Control System >> Electronic control System
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