Subaru Legacy IV (2008 year). Service manual — part 104
EN(H4SO)(diag)-19
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
Fuel pump relay control
B136
12
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
A/C relay control
B136
9
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Radiator fan relay 1 control
B136
18
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Radiator fan relay 2 control
B136
29
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Self-shutoff control
B136
23
0.5 or less
0.5 or less
—
Malfunction indicator light
B136
11
—
—
Light “ON”: 1 or less
Light “OFF”: 10 — 14
Engine speed output
B136
22
—
0 — 13 or more
Waveform
Oil temperature sensor signal
B134
23
1.0 — 1.4
1.0 — 1.4
After engine is
warmed up.
PCV diagnosis connector
B134
30
0
0
—
Purge control solenoid valve
B137
29
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
Duty waveform
EGR valve
Signal 1
B134
8
0 or 10 — 13
0 or 12 — 14
Waveform
Signal 2
B134
9
0 or 10 — 13
0 or 12 — 14
Waveform
Signal 3
B134
10
0 or 10 — 13
0 or 12 — 14
Waveform
Signal 4
B134
20
0 or 10 — 13
0 or 12 — 14
Waveform
Power steering oil pressure
switch
B134
33
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
—
Blower fan switch
B135
11
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
—
A/C middle pressure switch
B136
33
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
—
Oil switching
solenoid valve
RH
Signal (+)
B137
25
0
Duty waveform
Drive frequency:
300 Hz
Signal (–)
B137
24
0
0
—
Oil switching
solenoid valve
LH
Signal (+)
B137
31
0
Duty waveform
Drive frequency:
300 Hz
Signal (–)
B137
30
0
0
—
Variable valve lift diagnosis oil
pressure switch RH
B134
31
0
0
—
Variable valve lift diagnosis oil
pressure switch LH
B134
32
0
0
—
Front oxygen
(A/F) sensor
Signal (+)
B135
9
—
2.7 — 2.9
—
Signal (–)
B135
8
—
2.35 — 2.25
—
Shield
B135
1
0
0
—
Manifold absolute pressure sensor
B134
6
3.4 — 3.8
1.4 — 1.8
—
Air flow sensor
Signal
B135
26
—
0.3 — 4.5
—
Shield
B135
35
0
0
—
Ground
B135
34
0
0
—
Intake air temperature sensor
signal
B135
18
0.3 — 4.6
0.3 — 4.6
—
Immobilizer communication 1
B136
26
1 or less
mo 4 or
more
1 or less
mo 4 or
more
—
Immobilizer communication 2
B136
34
1 or less
mo 4 or
more
1 or less
mo 4 or
more
—
Contents
Connector
No.
Terminal
No.
Signal (V)
Note
Ignition SW ON
(engine OFF)
Engine ON
(idling)
EN(H4SO)(diag)-20
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
SSM communication line
B136
16
1 or less
mo 4 or
more
1 or less
mo 4 or
more
—
Sensor power supply
B134
19
5
5
—
B135
22
5
5
—
GND (sensor)
B134
29
0
0
—
B135
30
0
0
—
Ground
(Engine 1)
B134
5
0
0
—
(Engine 2)
B137
7
0
0
—
(Engine 3)
B137
2
0
0
—
(Engine 4)
B137
1
0
0
—
(Engine 5)
B137
3
0
0
—
(Ignition 1)
B137
26
0
0
—
(Ignition 2)
B137
6
0
0
—
(Body)
B136
6
0
0
—
Clutch switch
B136
25
When clutch pedal is
depressed: 0
When clutch pedal is
released: 10 — 13
When clutch pedal is
depressed: 0
When clutch pedal is
released: 12 — 14
—
Brake switch 1
B135
20
When brake pedal is
depressed: 0
When brake pedal is
released: 10 — 13
When brake pedal is
depressed: 0
When brake pedal is
released: 12 — 14
—
Brake switch 2
B135
28
When brake pedal is
depressed: 10 — 13
When brake pedal is
released: 0
When brake pedal is
depressed: 12 — 14
When brake pedal is
released: 0
—
Cruise control main switch
B135
12
ON: 0
OFF: 5
ON: 0
OFF: 5
—
Cruise control command switch
B135
24
When not operating:
3.5 — 4.5
When operating
RES/ACC: 2.5 — 3.5
When operating SET/
COAST: 0.5 — 1.5
When operating
CANCEL: 0 — 0.5
When not operating:
3.5 — 4.5
When operating
RES/ACC: 2.5 — 3.5
When operating SET/
COAST: 0.5 — 1.5
When operating
CANCEL: 0 — 0.5
—
Fuel temperature sensor
B135
17
2.5 — 3.8
2.5 — 3.8
Ambient temperature:
25°C (77°F)
Fuel tank pressure sensor
B135
32
2.3 — 2.7
2.3 — 2.7
Value after removing
fuel filler cap and
installing again
Pressure control solenoid valve
B136
28
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
—
Drain valve
B136
17
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
—
CAN communication line (+)
B136
27
2.5 — 3.5
2.5 — 3.5
Waveform
CAN communication line (–)
B136
35
1.5 — 2.5
1.5 — 2.5
Waveform
AT/MT identification line
B136
15
—
—
MT model: 1 or less
Contents
Connector
No.
Terminal
No.
Signal (V)
Note
Ignition SW ON
(engine OFF)
Engine ON
(idling)
EN(H4SO)(diag)-21
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
Input/output name
Measuring condition
Waveform
1. Crankshaft position sensor
At idling
2. Camshaft position sensor
At idling
EN-05322
ONE CRANK ROTATION
5V
10ms
0
EN-05323
ONE CAM ROTATION
5V
50ms
0
EN(H4SO)(diag)-22
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
EN-06829
JOINT
CONNECTOR
MT
1
9
14
3
AT
1
POWER STEERING
OIL PRESSURE
SWITCH
DELIVERY (TEST)
MODE CONNECTOR
A
CCELERA
T
OR PED
AL
POSITION SENSOR
JOINT
CONNECTOR
NEUTRAL
POSITION SWITCH
INHIBITOR
SWITCH
CLUTCH
SWITCH
STARTER
RELAY
IGNITION SWITCH
STARTER MOTOR
FUEL
PUMP
FUEL
PUMP
CONDENSER
FUEL
PUMP
RELAY
C25
C16
C6
B21
B29
B22
B32
B30
B31
B27
B23
M/B FUSE No. 13
M/B FUSE No. 11
F/B FUSE No. 4
F/B FUSE No. 21
F/B FUSE No. 12
MT
MT
MT
MT
DATA LINK
CONNECTOR
MT
MT
AT
CLUTCH
START
SWITCH
A33
C32
B5
B19
C12
C31
C20
FUEL TANK
PRESSURE SENSOR
: SEDAN MODEL
:
SD
SD
SD
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