Subaru Impreza 2003, Service Manual

Page: 1201 / 3610

EN(H4DOTC)-25
ENGINE (DIAGNOSTICS)
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
Fuel injec-
tor
#1 B84 1 10 — 13 1 — 14 Waveform
#2 B137 6 10 — 13 1 — 14 Waveform
#3 B137 5 10 — 13 1 — 14 Waveform
#4 B137 4 10 — 13 1 — 14 Waveform
Idle air
control
solenoid
valve
Signal B137 10 0 or 13 — 14 0 or 13 — 14 Waveform
Fuel pump
control unit
Signal 1 B134 13 — — —
Signal 2 B137 16 — — —
A/C relay control B84 27
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
—
Radiator fan relay 1
control
B84 17
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
—
Radiator fan relay 2
control
B84 28
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
Model with A/C only
Malfunction indicator
lamp
B84 15 — —
Light “ON”: 1, or less
Light “OFF”: 10 — 14
Engine speed output B137 9 — 0 — 13, or more Waveform
Purge control solenoid
valve
B84 16
ON: 1, or less
OFF: 10 — 13
ON: 1, or less
OFF: 13 — 14
—
Manifold
absolute
pressure
sensor
Signal B135 8 1.7 — 2.4 1.1 — 1.6
—
Power
supply
B135 9 5 5
GND (sen-
sor)
B135 19 0 0
Fuel level sensor B135 25 0.12 — 4.75 0.12 — 4.75 —
Small light switch B134 17
ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
—
Blower fan switch B134 9
ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
—
Rear defogger switch B134 3
ON: 0
OFF: 10 — 13
ON: 0
OFF: 13 — 14
—
Power steering oil pres-
sure switch
B135 24 10 — 13
ON: 0
OFF: 13 — 14
—
Wiper switch B135 12
ON: 10 — 13
OFF: 0
ON: 13 — 14
OFF: 0
—
Front oxygen (A/F) sen-
sor signal (+)
B84 29 2.8 — 3.2 2.8 — 3.2 —
Front oxygen (A/F) sen-
sor signal (
−
)
B84 19 2.4 — 2.7 2.4 — 2.7 —
Front oxygen (A/F) sen-
sor shield
B84 18 0 0 —
SSM/GST communica-
tion line
B134 21
Less than 1
←→
More
than 4
Less than 1
←→
More
than 4
—
Torque control 1 signal B134 19 More than 4 More than 4 —
Torque control 2 signal B134 18 More than 4 More than 4 —
Torque control cut sig-
nal
B137 14 8 8 —
AT diagnosis input sig-
nal
B135 20
Less than 1
←→
More
than 4
Less than 1
←→
More
than 4
Waveform
AT load signal B135 28 4.3 — 4.4 0.9 — 1.4 —
GND (sensors) B135 19 0 0 —
Content
Con-
nector
No.
Termi-
nal No.
Signal (V)
Note
Ignition SW ON
(Engine OFF)
Engine ON (Idling)