Subaru Legacy IV (2008 year). Service manual — part 103
EN(H4SO)(diag)-15
Electrical Component Location
ENGINE (DIAGNOSTICS)
(1)
Pressure control solenoid valve
(3)
Drain valve
(4)
Drain filter
(2)
Canister
EN-05733
(1)
(2)
(3)
(4)
EN-02980
(1)
EN-02981
(4)
(3)
(2)
EN(H4SO)(diag)-16
Electrical Component Location
ENGINE (DIAGNOSTICS)
(1)
Inhibitor switch
(4)
Fuel pump relay
(7)
Radiator sub fan relay
(2)
Fuel pump
(5)
Electronic throttle control relay
(8)
Radiator main fan relay 2
(3)
Main relay
(6)
Radiator main fan relay 1
(9)
Starter
EN-05734
(3)
(2)
(7)
(8)
(6)
(9)
(1)
(4)
(5)
EN-06888
(1)
(2)
EN-05726
EN-03150
(3)
(4)
(5)
EN-06796
(6)
(8)
(7)
EN-02096
(9)
EN(H4SO)(diag)-17
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
Contents
Connector
No.
Terminal
No.
Signal (V)
Note
Ignition SW ON
(engine OFF)
Engine ON
(idling)
Crankshaft
position sensor
Signal (+)
B134
13
0
–7 — +7
Waveform
Signal (–)
B134
14
0
0
—
Shield
B134
24
0
0
—
Camshaft posi-
tion sensor
Signal (+)
B134
12
0
–7 — +7
Waveform
Signal (–)
B134
22
0
0
—
Shield
B134
24
0
0
—
Electronic throt-
tle control
Main
B134
18
0.64 — 0.72
Fully opened: 3.96
0.64 — 0.72
(After engine is
warmed up.)
Fully closed: 0.6
Fully opened: 3.96
Sub
B134
28
1.51 — 1.58
Fully opened: 4.17
1.51 — 1.58
(After engine is
warmed up.)
Fully closed: 1.48
Fully opened: 4.17
Power supply
B134
19
5
5
—
GND (sensor)
B134
29
0
0
—
Electronic throttle control motor
(+)
B137
5
Duty waveform
Duty waveform
Drive frequency:
500 Hz
Electronic throttle control motor
(–)
B137
4
Duty waveform
Duty waveform
Drive frequency:
500 Hz
Electronic throttle control motor
power supply
B136
1
10 — 13
12 — 14
—
Electronic throttle control motor
relay
B136
21
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
When ignition switch
is turned to ON: ON
EN-05288
B134
5
6
7
8
2
1
9
4
3
10
24
22
23
25
11
12
13
14
15
26
27
28
16
17
18
19
20
21
33
34
29
32
30
31
B136
5
6
7
8
2
1
9
4
3
10
24
22
23
25
11
12
13
14
15
26
27
28
16
17
18
19
20
21
33
34
29
32
30
31
35
B135
5
6
7
8
2
1
9
4
3
10
24
22
23
25
11
12
13
14
15
26
27
28
16
17
18
19
20
21
29
30
31
32
33
34
35
B137
5
6
7
8
2
1
9
4
3
10
22
23
11
12
13
14
15
24
25
26
16
17
18
19
20
21
27
28
29
30
31
TO A:
TO B:
TO C:
TO D:
EN(H4SO)(diag)-18
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
Accelerator
pedal position
sensor
Main sensor
signal
B135
23
Fully closed: 1.0
Fully opened: 3.5
Fully closed: 1.0
Fully opened: 3.5
—
Main power
supply
B135
21
5
5
—
GND
(Main sensor)
B135
29
0
0
—
Sub sensor
signal
B135
31
Fully closed: 1.0
Fully opened: 3.5
Fully closed: 1.0
Fully opened: 3.5
—
Sub power
supply
B135
22
5
5
—
GND
(Sub sensor)
B135
30
0
0
—
Rear oxygen
sensor
Signal
B135
4
0
0 — 0.9
—
Shield
B135
1
0
0
—
Front oxygen
(A/F) sensor
heater
Signal 1
B136
3
10 — 13
1 — 14
Duty waveform
Signal 2
B136
2
10 — 13
1 — 14
Duty waveform
Rear oxygen sensor heater signal
B136
4
10 — 13
1 — 14
Duty waveform
Engine coolant temperature
sensor
B134
34
1.0 — 1.4
1.0 — 1.4
After engine is
warmed up.
Starter switch
B136
32
0
0
AT model
Cranking: 8 — 14
MT model
Cranking with the
clutch pedal pressed:
8 — 14
Starter relay control
B136
20
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
A/C switch
B136
24
ON: 10 — 13
OFF: 0
ON: 12 — 14
OFF: 0
—
Ignition switch
B135
19
10 — 13
12 — 14
—
Neutral position switch
B136
31
ON: 0
OFF: 12
r0.5
AT model: Switch is
ON when select lever
is shifted into “P”
range or “N” range.
MT model: Switch is
ON when the shift
lever is in neutral.
Delivery (test) mode connector
B135
27
10 — 13
13 — 14
When connected: 0
Knock sensor
Signal
B134
15
2.5
2.5
—
Shield
B134
25
0
0
—
Back-up power supply
B135
5
10 — 13
12 — 14
Ignition switch “OFF”:
10 — 13
Control module power supply
B134
7
10 — 13
12 — 14
—
B135
2
10 — 13
12 — 14
—
Ignition control
#1, #2
B137
18
0
1 — 3.4
Waveform
#3, #4
B137
19
0
1 — 3.4
Waveform
Fuel injector
#1
B137
8
10 — 13
1 — 14
Waveform
#2
B137
9
10 — 13
1 — 14
Waveform
#3
B137
10
10 — 13
1 — 14
Waveform
#4
B137
11
10 — 13
1 — 14
Waveform
Contents
Connector
No.
Terminal
No.
Signal (V)
Note
Ignition SW ON
(engine OFF)
Engine ON
(idling)
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