Subaru Impreza 2003, Service Manual

Page: 436 / 3610

EN(H4SO)-24
ENGINE (DIAGNOSTICS)
ENGINE CONTROL MODULE (ECM) I/O SIGNAL
A/C switch B136 11
ON: 10 — 13
OFF: 0
ON: 13 — 14
OFF: 0
—
Ignition switch B136 10 10 — 13 13 — 14 —
Neutral
position
switch
MT B136 21
ON: 12
±
0.5
OFF: 0
Switch is ON when gear is in
neutral position.
AT B136 21
ON: 0
OFF: 12
±
0.5
Switch is ON when shift is in “N”
or “P” position.
Test mode connector B136 3 5 5 When connected: 0
Knock
sensor
Signal B135 16 2.8 2.8 —
Shield B135 27 0 0 —
Back-up power supply B135 9 10 — 13 13 — 14 Ignition switch “OFF”: 10 — 13
Control unit power sup-
ply
B135 1 10 — 13 13 — 14 —
B135 2 10 — 13 13 — 14 —
Sensor power supply B135 3 5 5 —
Ignition
control
#1, #2 B134 33 0 1 — 3.4 Waveform
#3, #4 B134 32 0 1 — 3.4 Waveform
Fuel injec-
tor
#1 B134 34 10 — 13 1 — 14 Waveform
#2 B134 23 10 — 13 1 — 14 Waveform
#3 B134 22 10 — 13 1 — 14 Waveform
#4 B134 8 10 — 13 1 — 14 Waveform
Idle air
control
solenoid
valve
Signal 1 B134 20 — 1 — 13 Waveform
Signal 2 B134 6 — 1 — 13 Waveform
Signal 3 B134 5 — 1 — 13 Waveform
Signal 4 B134 19 — 1 — 13 Waveform
Power
supply
B135 2 10 — 13 13 — 14 —
Fuel pump relay control B134 2
ON: 0.5, or less
OFF: 10 — 13
0.5, or less —
A/C relay control B134 9
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
—
Radiator fan relay 1
control
B134 14
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
—
Radiator fan relay 2
control
B134 13
ON: 0.5, or less
OFF: 10 — 13
ON: 0.5, or less
OFF: 13 — 14
Models with A/C
Self-shutoff control B136 12 10 — 13 13 — 14 —
Malfunction indicator
light
B134 28 — —
Light “ON”: 1, or less
Light “OFF”: 10 — 14
Engine speed output B134 10 — 0 — 13, or more Waveform
Torque control 1 signal B136 1 5 5 —
Torque control 2 signal B136 18 5 5 —
Torque control cut sig-
nal
B136 15 8 8 —
Purge control solenoid
valve
B134 29
ON: 1, or less
OFF: 10 — 13
ON: 1, or less
OFF: 13 — 14
—
Fuel level sensor B135 25 0.12 — 4.75 0.12 — 4.75 —
EGR sole-
noid valve
Signal 1 B134 18 0 or 10 — 13 0 or 10 — 13 —
Signal 2 B134 17 0 or 10 — 13 0 or 10 — 13 —
Signal 3 B134 16 0 or 10 — 13 0 or 10 — 13 —
Signal 4 B134 15 0 or 10 — 13 0 or 10 — 13 —
AT diagnosis input sig-
nal
B137 19
Less than 1
←→
More than 4
Less than 1
←→
More than 4
Waveform
Content
Con-
nector
No.
Terminal
No.
Signal (V)
Note
Ignition SW ON
(Engine OFF)
Engine ON (Idling)