Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 199
EN(H4DOTC)(diag)-20
Electrical Component Location
ENGINE (DIAGNOSTICS)
(1)
Leak check valve ASSY
(2)
Canister
(3)
Pressure control solenoid valve
ASSY
EN-09241
(2)
(1)
(3)
EN-08788
(1)
EN-09242
(2)
EN-09404
(3)
EN(H4DOTC)(diag)-21
Electrical Component Location
ENGINE (DIAGNOSTICS)
(1)
Starter
(5)
Electronic throttle control relay
(9)
Secondary air combination valve
relay 1
(2)
Fuel pump
(6)
Radiator main fan relay 1
(10) Secondary air combination valve
relay 2
(3)
Main relay
(7)
Radiator sub fan relay
(11) Secondary air pump relay
(4)
Fuel pump relay
(8)
Radiator main fan relay 2
(12) A/F, oxygen sensor relay
EN-09243
(2)
(1)
(12)
(5)
(4)
(3)
(10) (11)
(6)(7)(8)(9)
EN-05614
(1)
EN-02093
(2)
EN-06150
(12)
(3)
(4)
(5)
EN-05073
(6)
(9)
(11)
(8)
(7)
(10)
EN(H4DOTC)(diag)-22
Electrical Component Location
ENGINE (DIAGNOSTICS)
4. TRANSMISSION
• 5MT model
• 6MT model
(1)
Neutral position switch
EN-06611
(1)
EN-08695
(1)
EN(H4DOTC)(diag)-23
Engine Control Module (ECM) I/O Signal
ENGINE (DIAGNOSTICS)
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
Description
Con-
nector
No.
Termi-
nal No.
Signal (V)
Note
Ignition SW ON
(engine OFF)
Engine ON
(idling)
Crankshaft
position
sensor
Signal (+)
B137
17
0
–7 — +7
Waveform
Signal (–)
B137
25
0
0
—
Shield
B137
31
0
0
—
Front oxy-
gen (A/F)
sensor
Signal (+)
B136
19
2.8 — 3.2
2.8 — 3.2
—
Signal (–)
B136
18
2.4 — 2.7
2.4 — 2.7
—
Shield
B136
9
0
0
—
Rear oxy-
gen sensor
Signal
B136
20
0
0 — 0.9
—
Shield
B136
9
0
0
—
Ground
(sensor)
B135
30
0
0
—
Front oxy-
gen (A/F)
sensor
heater
Signal 1
B136
6
—
—
Waveform
Signal 2
B136
5
—
—
Waveform
Rear oxygen sensor
heater signal
B135
6
0 — 13
12 — 14
Waveform
Engine
coolant
tempera-
ture sensor
Signal
B137
22
1.0 — 1.4
1.0 — 1.4
After engine is warmed up.
Ground
(sensor)
B134
29
0
0
After engine is warmed up.
Air flow
sensor
Signal
B136
22
—
0.3 — 4.5
—
Shield
B136
10
0
0
—
Ground
B136
11
0
0
—
Intake air temperature
sensor signal
B136
31
0.3 — 4.6
0.3 — 4.6
—
Wastegate control sole-
noid valve
B134
33
0 or 10 — 13
0 or 12 — 14
Waveform
Starter switch
B136
16
0
0
Cranking: 8 — 14
A/C switch
B136
29
ON: 10 — 13
OFF: 0
ON: 12 — 14
OFF: 0
—
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:
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