Subaru Legacy IV (2008 year). Manual — part 511
EN(H6DO)(diag)-17
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
Description
Connector
No.
Terminal
No.
Signal (V)
Reference
Ignition SW ON
(engine OFF)
Engine ON
(idling)
Crankshaft posi-
tion sensor
Signal (+)
B134
13
0
–7 — +7
Waveform
Signal (–)
B134
14
0
0
—
Shield
B134
24
0
0
—
Camshaft posi-
tion sensor (LH)
Signal
B134
21
0.275
0 or 5
Waveform
Ground
B134
22
0
0
—
Camshaft posi-
tion sensor (RH)
Signal
B134
11
0.275
0 or 5
Waveform
Ground
B134
22
0
0
—
Electronic throt-
tle control
Main
B134
18
0.64 — 0.94
Fully opened: 4.01
0.64 — 0.72
(After engine is
warmed up.)
Fully closed: 0.6
Fully opened: 4.01
Sub
B134
28
1.51 — 1.76
Fully opened: 4.23
1.51 — 1.58
(After engine is
warmed up.)
Fully closed: 1.48
Fully opened: 4.23
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
EGR valve
Signal A+
B134
8
10 — 13
12 — 14
—
Signal A–
B134
9
10 — 13
12 — 14
—
Signal B+
B134
10
10 — 13
12 — 14
—
Signal B–
B134
20
10 — 13
12 — 14
—
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(H6DO)(diag)-18
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
Accelerator pedal
position sensor
Main sensor
signal
B135
23
Fully closed: 1
Fully opened: 3.6
Fully closed: 1
Fully opened: 3.3
—
Main power
supply
B135
21
5
5
—
Ground
(main sensor)
B135
29
0
0
—
Sub sensor
signal
B135
31
Fully closed: 1
Fully opened: 3.7
Fully closed: 1
Fully opened: 3.3
—
Sub power
supply
B135
22
5
5
—
Ground
(sub sensor)
B135
30
0
0
—
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
Cranking: 8 — 14
Starter relay
B136
20
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
—
A/C switch
B136
24
ON: 10 — 13
OFF: 0
ON: 12 — 14
OFF: 0
—
A/C lock sensor
B135
14
Duty waveform
Duty waveform
Auto A/C model
A/C middle pressure switch
B136
33
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
—
Ignition switch
B135
19
10 — 13
12 — 14
—
Neutral position switch
B136
31
ON: 0
OFF: 12
r0.5
Switch is ON when
select lever is shifted
into “P” range or “N”
range.
Delivery (test) mode connector
B135
27
12 — 14
12 — 14
When connected: 0
Knock sensor 1
Signal
B134
15
2.4
2.4
—
Shield
B134
25
0
0
—
Knock sensor 2
Signal
B134
16
2.4
2.4
—
Shield
B134
25
0
0
—
Back-up power supply
B135
5
10 — 13
12 — 14
Ignition switch “OFF”:
10 — 13
Control module power supply
B135
2
10 — 13
12 — 14
—
B134
7
10 — 13
12 — 14
—
Sensor power supply
B134
19
5
5
—
Ignition control
#1
B137
18
0
0 — 14
Waveform
#2
B137
19
0
0 — 14
Waveform
#3
B137
20
0
0 — 14
Waveform
#4
B137
21
0
0 — 14
Waveform
#5
B137
22
0
0 — 14
Waveform
#6
B137
23
0
0 — 14
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
#5
B137
12
10 — 13
1 — 14
Waveform
#6
B137
13
10 — 13
1 — 14
Waveform
A/C relay control
B136
9
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Description
Connector
No.
Terminal
No.
Signal (V)
Reference
Ignition SW ON
(engine OFF)
Engine ON
(idling)
EN(H6DO)(diag)-19
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
Blower fan switch
B135
16
ON: 0
OFF: 10 — 13
ON: 0
OFF: 12 — 14
Manual A/C model
Radiator fan control
B136
18
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Radiator fan control power supply
B136
29
ON: 0.5 or less
OFF: 10 — 13
ON: 0.5 or less
OFF: 12 — 14
—
Self-shutoff control
B136
23
0
0
—
Malfunction indicator light
B136
11
—
—
Light “ON”: 1 or less
Light “OFF”: 10 — 14
Engine speed output
B136
22
—
0 — 13 or more
Waveform
Purge control solenoid valve
B137
29
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
—
Power steering switch
B134
33
ON: 1 or less
OFF: 10 — 13
ON: 1 or less
OFF: 12 — 14
—
Manifold absolute pressure sensor
B134
6
3.5 — 4.8
1.1 — 1.9
—
Air flow sensor
Signal
B135
26
0.74
0.3 — 4.5
—
Shield
B135
35
0
0
—
Ground
B135
34
0
0
—
Intake air temperature sensor
B135
18
3.15 — 3.33
3.15 — 3.33
Intake air temperature:
25°C (77°F)
Front oxygen (A/F)
sensor RH
Signal (+)
B135
9
2.8 — 3.2
2.8 — 3.2
—
Signal (–)
B135
8
2.4 — 2.7
2.4 — 2.7
—
Shield
B135
1
0
0
—
Front oxygen (A/F)
sensor heater RH
Signal 1
B136
3
12 — 14
—
Waveform
Signal 2
B136
2
12 — 14
—
Waveform
Front oxygen (A/F)
sensor LH
Signal (+)
B135
11
2.8 — 3.2
2.8 — 3.2
—
Signal (–)
B135
10
2.4 — 2.7
2.4 — 2.7
—
Shield
B135
1
0
0
—
Front oxygen (A/F)
sensor heater LH
Signal 1
B135
7
12 — 14
—
Waveform
Signal 2
B135
6
12 — 14
—
Waveform
Rear oxygen
sensor RH
Signal
B135
4
0
0 — 0.9
—
Shield
B135
1
0
0
—
Rear oxygen sensor heater RH
signal
B136
4
12 — 14
—
Waveform
Rear oxygen
sensor LH
Signal
B135
15
0
0 — 0.9
—
Shield
B135
1
0
0
—
Rear oxygen sensor heater LH
signal
B136
5
12 — 14
—
Waveform
Immobilizer communication 1
B136
26
10
10
—
Immobilizer communication 2
B136
34
10
10
—
Fuel pump con-
trol unit
Signal 1
B135
33
0
12 — 14
—
Signal 2
B136
12
0
0 or 5
—
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
—
Description
Connector
No.
Terminal
No.
Signal (V)
Reference
Ignition SW ON
(engine OFF)
Engine ON
(idling)
EN(H6DO)(diag)-20
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
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
—
Cruise control main switch
B135
12
ON: 0
OFF: 5
ON: 0
OFF: 5
—
Oil flow control
solenoid valve RH
Signal (+)
B137
17
0
0.6
—
Signal (–)
B137
16
0
0
—
Oil flow control
solenoid valve LH
Signal (+)
B137
15
0
0.6
—
Signal (–)
B137
14
0
0
—
Oil switching
solenoid valve RH
Signal (+)
B137
25
0
1.9
—
Signal (–)
B137
24
0
0
—
Oil switching
solenoid valve LH
Signal (+)
B137
31
0
1.9
—
Signal (–)
B137
30
0
0
—
Oil temperature sensor signal
B134
23
1.0 — 1.4
1.0 — 1.4
After engine is
warmed up.
Variable valve lift diagnosis oil
pressure switch RH
B134
31
0
0
—
Variable valve lift diagnosis oil
pressure switch LH
B134
32
0
0
—
Generator control
B136
10
0 — 6.5
0 — 6.5
—
SSM communication line
B136
16
1 or less
mo 4 or
more
1 or less
mo 4 or
more
—
Clutch switch
B136
25
10 — 13
12 — 14
—
GND (sensor)
B135
30
0
0
—
Ground (ignition
system)
(Ignition 1)
B137
26
0
0
—
(Ignition 2)
B137
6
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
—
Engine 6
B134
3
0
0
—
Body
B136
6
0
0
—
Sensor GND (engine side)
B134
29
0
0
—
Fuel tank pressure sensor
B135
32
2.3
2.7
—
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
—
Fuel temperature sensor
B135
17
2.5 — 3.8
2.5 — 3.8
Ambient tempera-
ture: 25°C (77°F)
CAN communication (+)
B136
27
2.0 — 4.5
2.0 — 4.5
Waveform
CAN communication (–)
B136
35
0.5 — 3.0
0.5 — 3.0
Waveform
Description
Connector
No.
Terminal
No.
Signal (V)
Reference
Ignition SW ON
(engine OFF)
Engine ON
(idling)
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