SUBARU FORESTER 2004 Service Repair Manual

EN(H4DOTC)-21
ENGINE (DIAGNOSTIC)
Electrical Component Location
 SENSOR
(1) Rear vehicle speed sensor (AT
model)(3) Front vehicle speed sensor (AT
model)(5) ATF temperature sensor (AT
model)
(2) Front vehicle speed sensor (MT
model)(4) Torque converter turbine speed
sensor (AT model)(6) Brake light switch
(1)EN-00327(2)EN-00328
EN-00184 (3)
(1)EN-00107 (2)
EN-00186 (2)EN-00187(5)
EN-00188 (6)

EN(H4DOTC)-22
ENGINE (DIAGNOSTIC)
Electrical Component Location
 SOLENOID VALVE & SWITCH (AT model)
 SOLENOID VALVE & SWITCH (MT model)
(1) Inhibitor switch (4) Line pressure duty solenoid (7) 2-4 brake duty solenoid
(2) Shift solenoid valve 1 (5) Lock-up duty solenoid (8) Low clutch timing solenoid valve
(3) Shift solenoid valve 2 (6) Transfer duty solenoid (9) 2-4 brake timing solenoid valve
(1) Neutral Position Switch
EN-00329(1)
(2)(3)
EN-00330 (4)
(8)
(5)
(7) (9)
EN-00331 (6)
EN-00192 (1)

EN(H4DOTC)-23
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)
Crank-
shaft posi-
tion sensorSignal (+) B135 10 0−7 — +7 Waveform
Signal (−) B135 22 0 0 —
Shield B135 31 0 0 —
Camshaft
position
sensorSignal (+) B135 11 0−7 — +7 Waveform
Signal (−) B135 23 0 0 —
Shield B135 31 0 0 —
Throttle
position
sensorSignal B136 18Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7—
Pow er
supplyB136 16 5 5 —
GND
(sensors)B136 35 0 0 —
Rear Oxy-
gen Sen-
sorSignal B137 25 0 0 — 0.9 —
Shield B137 31 0 0 —
GND
(sensors)B136 35 0 0 —
Fr o nt ox y-
gen (A/F)
sensor
heaterSignal 1 B134 3 0 — 1.0 0 — 1.0 Waveform
Signal 2 B134 2 0 — 1.0 0 — 1.0 Waveform
Rear oxygen sensor
heater signalB135 2 0 — 1.0 0 — 1.0 Waveform
Engine
coolant
tempera-
ture sen-
sorSignal B136 14 1.0 — 1.4 1.0 — 1.4 After engine is warmed-up.
GND
(sensors)B136 35 0 0 After engine is warmed-up.
Vehicle speed signal B135 26 0 or 5 0 or 5“5” and “0” are repeatedly dis-
played when vehicle is driven.
EN-02308
B134
34
3330 31 3229 26
27
28 25
1
2
8 9 310
11 12
19 20 21 13 14
15
16 17
18 22 23 24
3330 31 32
29 26
27
28 25
7
8 9 5 64
10
11 12
19 20 21 13 14
15 16
17
18 22
23 241
2 3
7 5 64
3534
B137 B135
B136
33
30 31
32
29 26
27
28 25
8 910
11 12
19
20 21 13 14
15 16 17
18
22
23 241
2
3
75 64
3534
30 3129
26
27
28 25
8 910
11 12
19 20 21 13 14
15 16 17
18 22
23 241 2
3
75 64

EN(H4DOTC)-24
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
AV C S
camshaft
position
sensor RHSignal (+) B135 21 0−7 — +7 Waveform
Signal (−) B135 29 0 0 —
Shield B135 30 0 0 —
AV C S
camshaft
position
sensor LHSignal (+) B135 20 0−7 — +7 Waveform
Signal (−) B135 28 0 0 —
Shield B135 30 0 0 —
Generator signal B134 22ON: 1, or less
OFF: 10 — 13ON: 1, or less
OFF: 10 — 13Wavefor m
Air flow
sensorSignal B136 23 — 0.3 — 4.5 —
Shield B136 32 0 0 —
GND B136 31 0 0 —
Intake air temperature
sensor signalB136 13 0.3 — 4.6 0.3 — 4.6 —
Exhaust
gas tem-
perature
sensorSignal B136 24 — — —
GND
(sensor)B136 35 0 0 —
Tu m b l e
generator
valve posi-
tion sen-
sor RHSignal B136 27Fully closed: 3.8 — 4.9
Fully opened: 0.2 — 0.9—
Pow er
supplyB136 16 5 5 —
GND
(sensor)B136 35 0 0 —
Tu m b l e
generator
valve posi-
tion sen-
sor LHSignal B136 26Fully closed: 3.8 — 4.9
Fully opened: 0.2 — 0.9—
Pow er
supplyB136 16 5 5 —
GND
(sensor)B136 35 0 0 —
Tumble generator valve
RH (open)B134 9 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
RH (close)B134 8 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
LH (open)B134 11 0 or 10 — 13 0 or 13 — 14 Waveform
Tumble generator valve
LH (close)B134 10 0 or 10 — 13 0 or 13 — 14 Waveform
Wastegate control sole-
noid valveB134 32 0 or 10 — 13 0 or 13 — 14 —
Starter switch B137 8 0 0 Cranking: 8 — 14
A/C switch B137 17ON: 10 — 13
OFF: 0ON: 13 — 14
OFF: 0—
Ignition switch B137 14 10 — 13 13 — 14 —
Neutral Position Switch B137 9ON: 12±0.5
OFF: 0Switch is ON when gear is in
neutral position.
Test Mode Connector B137 15 10 — 13 13 — 14 When connected: 0
Knock
sensorSignal B136 25 2.8 2.8 —
Shield B136 33 0 0 —
Back-up power supply B135 19 10 — 13 13 — 14 Ignition switch “OFF”: 10 — 13
Control module power
supplyB135 5 10 — 13 13 — 14 —
B135 6 10 — 13 13 — 14 — DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)

EN(H4DOTC)-25
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
Sensor power supply B136 16 5 5 —
Oil flow
control
solenoid
valve RHSignal (+) B134 18ON: 10 — 13
OFF: 0ON: 13 — 14
OFF: 0—
Signal (−) B134 28 0 0 —
Oil flow
control
solenoid
valve LHSignal (+) B134 19ON: 10 — 13
OFF: 0ON: 13 — 14
OFF: 0—
Signal (−) B134 29 0 0 —
Ignition
control#1 B135 18 0 13 — 14 Waveform
#2 B135 17 0 13 — 14 Waveform
#3 B135 16 0 13 — 14 Waveform
#4 B135 15 0 13 — 14 Waveform
Fuel injec-
tor#1 B136 6 10 — 13 1 — 14 Waveform
#2 B136 5 10 — 13 1 — 14 Waveform
#3 B136 4 10 — 13 1 — 14 Waveform
#4 B136 3 10 — 13 1 — 14 Waveform
Idle air
control
solenoid
valveSignal B134 27 0 or 13 — 14 0 or 13 — 14 Waveform
Fuel pump
control unitDiagnosis
signalB137 28 10 — 13 13 — 14 Waveform
Control
signalB135 27 0 or 5 0 or 5 —
A/C relay control B135 33ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 13 — 14—
Radiator fan relay 1 con-
trolB135 25ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 13 — 14—
Radiator fan relay 2 con-
trolB135 24ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 13 — 14Model with A/C
Malfunction indicator
lightB134 17 — —Light “ON”: 1, or less
Light “OFF”: 10 — 14
Engine speed output B134 23 — 0 — 13, or more Waveform
Purge control solenoid
valveB134 14ON: 1, or less
OFF: 10 — 13ON: 1, or less
OFF: 13 — 14Wavefor m
Manifold
absolute
pressure
sensorSignal B136 22 1.7 — 2.4 1.1 — 1.6
— Pow er
supplyB136 16 5 5
GND
(sensors)B136 35 0 0
Fuel level sensor B136 20 0.12 — 4.75 0.12 — 4.75 —
Small light switch B137 12ON: 0
OFF: 10 — 13ON: 0
OFF: 13 — 14—
Blower fan switch B137 13ON: 0
OFF: 10 — 13ON: 0
OFF: 13 — 14—
Rear defogger switch B137 11ON: 0
OFF: 10 — 13ON: 0
OFF: 13 — 14—
Power steering oil pres-
sure switchB137 10 10 — 13ON: 0
OFF: 13 — 14—
Wiper switch B137 23ON: 10 — 13
OFF: 0ON: 13 — 14
OFF: 0— DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)

EN(H4DOTC)-26
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
Front oxygen (A/F) sen-
sor signal (+)B134 33 2.8 — 3.2 2.8 — 3.2 —
Front oxygen (A/F) sen-
sor signal (−)B134 26 2.4 — 2.7 2.4 — 2.7 —
Front oxygen (A/F) sen-
sor shieldB134 25 0 0 —
SSM/GST communica-
tion lineB137 20Less than 1←→
More than 4Less than 1←→
More than 4—
CAN Communication
(+)B137 18 Pulse signal Pulse signal
CAN Communication (−) B137 26 Pulse signal Pulse signal
GND (sensor) B136 35 0 0 —
GND (injector) B137 7 0 0 —
GND (ignition system) B135 12 0 0 —
GND (power supply)B135 1 0 0 —
B135 4 0 0 —
GND (control system)B137 1 0 0 —
B137 2 0 0 —
GND (oxygen sensor
heater 1)B134 7 0 0 —
GND (oxygen sensor
heater 2)B134 6 0 0 — DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)

EN(H4DOTC)-27
ENGINE (DIAGNOSTIC)
Engine Condition Data
6. Engine Condition Data
A: ELECTRICAL SPECIFICATION
Measuring condition:
 After engine is warmed-up.
 Gear position is in neutral.
 Turn the A/C to OFF.
 Turn all accessory switches to OFF.
Remarks Specification
Engine load1.3 — 2.6 (%): Idling
4.4 — 9.6 (%): 2,500 rpm racing

EN(H4DOTC)-28
ENGINE (DIAGNOSTIC)
Transmission Control Module (TCM) I/O Signal
7. Transmission Control Module (TCM) I/O Signal
A: ELECTRICAL SPECIFICATION
<Ref. to 4AT(H4SO)-12, Transmission Control Module (TCM) I/O Signal.>

EN(H4DOTC)-29
ENGINE (DIAGNOSTIC)
Data Link Connector
8. Data Link Connector
A: NOTE
This connector is used both for OBD-II general scan tools and the Subaru Select Monitor.
CAUTION:
Do not connect any scan tools other than the OBD-II general scan tools and the Subaru Select Mon-
itor, because the circuit for the Subaru Select Monitor may be damaged.
EN-00037
12345 768
910111213 1514 16
Terminal No. Remarks Terminal No. Remarks
1Power supply 9Empty
2 Empty 10 Subaru Select Monitor signal
3 Empty 11 Empty
4 Empty 12 Ground
5 Empty 13 Ground
6 Empty 14 Empty
7 Empty 15 Empty
8 Empty 16 Empty

EN(H4DOTC)-30
ENGINE (DIAGNOSTIC)
OBD-II General Scan Tool
9. OBD-II General Scan Tool
A: OPERATION
1. HOW TO USE OBD-II GENERAL SCAN
TOOL
1) Prepare a general scan tool (OBD-II general
scan tool) required by SAE J1978.
2) Open the cover and connect the OBD-II general
scan tool to the data link connector located in the
lower portion of the instrument panel (on the driv-
er’s side).
3) Using the OBD-II general scan tool, call up the
DTC and freeze frame data.
OBD-II general scan tool functions consist of:
(1) MODE $01: Current powertrain diagnostic
data
(2) MODE $02: Powertrain freeze frame data
(3) MODE $03: Emission-related powertrain di-
agnostic trouble codes
(4) MODE $04: Clear/Reset emission-related
diagnostic information
Read out data according to repair procedures.(For
detailed operation procedures, refer to the OBD-II
General Scan Tool Operation Manual.)
NOTE:
For details concerning DTCs, refer to the List of Diag-
nostic Trouble Code (DTC). <Ref. to EN(H4DOTC)-
74, List of Diagnostic Trouble Code (DTC).>
EN-00334