Subaru Impreza 2003, Service Manual

Page: 794 / 3610

EN(H4SOw/oOBD)-18
ENGINE (DIAGNOSTICS)
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
Content
Connec-
tor No.
Terminal
No.
Signal (V)
Note Ignition SW
Engine ON
(Idling)
ON (Engine OFF)
Crankshaft
position
sensor
Signal (+) B135 *2 1 0
±
6 Sensor output waveform
Signal (
−
) B135 8 0 0 —
Shield B135 10 0 0 —
Camshaft
position
sensor
Signal (+) B135 *1 2 0
±
6 Sensor output waveform
Signal (
−
) B135 8 0 0 —
Shield B135 10 0 0 —
Intake air
tempera-
ture sensor
Signal B136 13 2.3 — 2.5 1.4 — 1.6 Ambient temperature: 25
°
C (77
°
F)
Throttle
position
sensor
Signal B136 17
Fully closed: 0.5
±
0.3
Fully opened: 4.3
±
0.3
—
Power
supply
B136 15 5
5
—
GND B136 16 0 0 —
Oxygen
sensor
Signal B136 7 0
Rich mixture: 0.7
Lean mixture: 0
Shield B136 23 0 0 —
Engine cool-
ant temper-
ature sensor Signal B136 14 0.6 — 1.0 0.6 — 1.0 After warm-up
GND B136 16 0 0 —
Vehicle speed sensor B135 24 0 or 5 0 or 5
“5” and “0” are repeatedly displayed
when vehicle is driven.
Starter switch B135 28 0 0 Cranking: 10 to 14
A/C switch B135 27
ON: 10 — 13
OFF: 0
ON: 13 — 14
OFF: 0
—
Ignition switch B135 7 10 — 13 13 — 14 —
Neutral position switch
(MT)
B135 26
ON: 5
OFF: 0
Switch is ON when gear is in neutral
position.
Park/Neutral position
switch (AT)
B135 26
ON: 0
OFF: 5
Switch is ON when shift lever is in
“P” or “N” position.
EN-01540
To:
17
30 14
28 16 18
31 15
29
8
23
35 22
34
7
8
23 20 22
11
21
12 10
2 3 1
9 17 14
28
19 16 13
27
18 15
26 25 24
6 4 7 5
8
23 22
11
21
12 10
24
2 3 1
9
B134 To: B135
20
33 19
32
6 5
21 13
27 11 12
26 10
25 24
4 2 3 1
9
To: B136
20 17 14
28 29 30
19 16 13
27
18 15
26 25
6 4 7 5