Subaru Impreza 2002 Service Manual page 251

ENGINE CONTROL MODULE (ECM) I/O SIGNAL
ENGINE (DIAGNOSTICS)
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
To
7 6
15 14
22 21
Content
Signal (+)
Crank-
shaft posi- Signal (−)
tion sensor
Shield
Signal (+)
Camshaft
position Signal (−)
sensor
Shield
Signal
Throttle
Power
position
supply
sensor
GND (sen-
sor)
Signal
Rear oxy-
Shield
gen sen-
GND (sen-
sor
sor)
Front oxy- Signal 1
gen (A/F)
sensor
Signal 2
heater
Rear oxygen sensor
heater signal
Engine Signal
coolant
tempera-
GND (sen-
ture sen-
sor)
sor
Vehicle speed signal
B134
5 4 3 2 1
13 12 11 10 9 8
20 19 18 17 16
To
B137
9 8 7 6 4 5 3
21 20 19 18 17 16 15 14 13 12
31 30 29 28 27 26 25 24
Con-
Termi-
nector
Ignition SW ON
nal No.
No.
(Engine OFF)
B135 2
B135 11
B135 21
B135 1
B135 10
B135 21
B135 7
B135 9
B135 19
B135 17
B135 26
B135 19
B137 4 0 — 1.0
B137 5 0 — 1.0
B136 13 0 — 1.0
B135 18 1.0 — 1.4
B135 19
B134 1
EN(TURBO)-14
To
B135
9 8 7 6 5 4 3 2 1
19 18 17 16 15 14 13 12 11 10
28 27 26 25 24 23 22
21 20
To B84
2 1 6 5 4
11 10 12 11 10
23 22 17 16
Signal (V)
Engine ON (Idling)
−7 — +7
0
0
0
−7 — +7
0
0
0
Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7
5
0
0 0 — 0.9
0
0
0 — 1.0
0 — 1.0
0 — 1.0
1.0 — 1.4
0
0 or 5 0 or 5
To
B136
6 5 4 3 2 1
7
16 15 14 13 12 11 10
9 8
22
24 23 21 20 19 18 17
3 2 1
9 8 7
15 14 13
Sensor output waveform
0
0
Sensor output waveform
0
0
5
0
0
0
After warm-up the engine.
0 After warm-up the engine.
"5" and "0" are repeatedly dis-
played when vehicle is driven.
EN0955
Note
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