relay SUBARU FORESTER 2004 Service Manual PDF

EN(H4SO)-22
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
A/C switch B136 11ON: 10 — 13
OFF: 0ON: 12 — 14
OFF: 0—
Ignition switch B136 10 10 — 13 12 — 14 —
Neutral
Po si ti o n
SwitchMT B136 21ON: 12±0.5
OFF: 0Switch is ON when gear is in
neutral position.
AT B136 21ON: 0
OFF: 12±0.5Switch is ON when shifted into
“P” or “N” range.
Test Mode Connector B136 3 5 5 When connected: 0
Knock
sensorSignal B135 16 2.8 2.8 —
Shield B135 27 0 0 —
Back-up power supply B135 9 10 — 13 12 — 14 Ignition switch “OFF”: 10 — 13
Control module power
supplyB135 1 10 — 13 12 — 14 —
B135 2 10 — 13 12 — 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
valveSignal 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
Pow er
supplyB135 2 10 — 13 12 — 14 —
Fuel pump relay control B134 2ON: 0.5, or less
OFF: 10 — 130.5, or less —
A/C relay control B134 9ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 12 — 14—
Heater cock solenoid B134 11 10 — 13 12 — 14 —
Radiator fan relay 1 con-
trolB134 14ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 12 — 14—
Radiator fan relay 2 con-
trolB134 13ON: 0.5, or less
OFF: 10 — 13ON: 0.5, or less
OFF: 12 — 14Model with A/C
Self-shutoff control B136 12 10 — 13 12 — 14 —
Malfunction indicator
lightB134 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 signal B136 15 8 8 —
Purge control solenoid
valveB134 29ON: 1, or less
OFF: 10 — 13ON: 1, or less
OFF: 12 — 14—
Fuel level sensor B135 25 0.12 — 4.75 0.12 — 4.75 —
EGR valveSignal 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-
nalB137 19Less than 1←→
More than 4Less than 1←→
More than 4Wavefor m DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)

EN(H4SO)-30
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
4. READ CURRENT DATA FOR ENGINE. (NORMAL MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» display screen, select the {Current Data Display/Save}, and then press the
[YES] key.
5) On the «Data Display Menu» display screen, select the {Data Display} and press the [YES] key.
6) Using the scroll key, scroll the display screen up or down until the desired data is shown.
 A list of the support data is shown in the following table.
Description Display Unit of measure
Battery voltage Battery Voltage V
Vehicle speed signal Meter vehicle speed km/h or MPH
Engine speed signal Engine speed rpm
Engine coolant temperature signal Engine coolant temperature°C or (°F)
Ignition timing signal Ignition timing deg
Throttle position signal Amount of intake air %
Throttle position signal Throttle Sensor Voltage V
Injection pulse width Fuel injection pulse width ms
Idle air control signal ISC Steps STEP
Engine load data Engine load %
Front oxygen (A/F) sensor resistance A/F sensor resistance value 1 ohm
Front oxygen (A/F) sensor output signal A/F sensor current value 1 —
Rear oxygen sensor output signalRear oxygen sensor voltage
valueV
Short term fuel trim A/F Compensation 1 %
Knock sensor signal Knock Correction deg
Atmospheric absolute pressure signal Atmospheric pressure mmHg, kPa, inHg or psi
Intake manifold relative pressure signal Mani. Relative Pressure mmHg, kPa, inHg or psi
Intake manifold absolute pressure signalIntake manifold absolute pres-
suremmHg, kPa, inHg or psi
A/F correction (short term fuel trim) by rear oxygen sensor A/F Compensation 3 %
Long term whole fuel trim A/F learning 1 %
Front oxygen (A/F) sensor heater current Front O2 heater current value A
Rear oxygen sensor heater current Rear O2 heater current value A
Canister purge control solenoid valve duty ratio CPC Valve Duty Ratio %
Fuel level signal Fuel level voltage V
Intake air temperature signal Intake air temperature°C or (°F)
Learned ignition timing Ignition learning value deg
EGR signal EGR Steps STEP
Ignition switch signal Ignition SW ON or OFF
Test mode connector signal Test mode signal ON or OFF
Neutral position switch signal Neutral SW ON or OFF
Air conditioning switch signal A/C SW ON or OFF
Air conditioning compressor signal A/C Compressor Signal ON or OFF
Radiator main fan relay signal Radiator fan relay 1 ON or OFF
Fuel pump relay signal Fuel pump relay ON or OFF
Knocking signal Knock signal ON or OFF
Radiator sub fan relay signal Radiator fan relay 2 ON or OFF
Power steering switch signal Power steering SW input signal ON or OFF
Engine torque control signal #1 AT coordinate request signal 1 ON or OFF
Engine torque control signal #2 AT coordinate request signal 2 ON or OFF

EN(H4SO)-34
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
7. LED OPERATION MODE FOR ENGINE
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» display screen, select the {Current Data Display/Save}, and then press the
[YES] key.
5) On the «Data Display Menu» display screen, select the {Data & LED Display} and press the [YES] key.
6) Using the scroll key, scroll the display screen up or down until the desired data is shown.
 A list of the support data is shown in the following table.
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
Description Display Message LED “ON” requirements
Ignition switch signal Ignition SW ON or OFF When ignition switch is ON
Test mode connector signal Test mode signal ON or OFF When test mode connector is connected.
Neutral position switch signal Neutral SW ON or OFF When neutral position signal is entered.
Air conditioning switch signal A/C SW ON or OFF When air conditioning switch is ON
Air conditioning relay signal A/C Compressor Relay ON or OFF When air conditioning relay is in function.
Radiator main fan relay signal Radiator fan relay 1 ON or OFF When radiator main fan relay is in function.
Fuel pump relay signal Fuel pump relay ON or OFF When fuel pump relay is in function.
Knocking signal Knock signal ON or OFF When knocking signal is input.
Radiator sub fan relay signal Radiator fan relay 2 ON or OFF When radiator sub fan relay is in function.
Engine torque control signal #1 AT coordinate request signal 1 ON or OFFWhen engine torque control signal 1 is
entered
Engine torque control signal #2 AT coordinate request signal 2 ON or OFFWhen engine torque control signal 2 is
entered
Engine torque control permission
signalAT coordinate permission sig-
nalON or OFFWhen engine torque control permission sig-
nal is entered.
Front oxygen (A/F) sensor rich sig-
nalFront O2 Rich Signal #1 ON or OFFWhen front oxygen (A/F) sensor mixture ratio
is rich.
Rear oxygen sensor rich signal RrO2 monitor ON or OFFWhen rear oxygen sensor mixture ratio is
rich.
Starter switch signal Starter SW ON or OFF When starter switch signal is entered.
Idle switch signal Idle Switch Signal ON or OFF When idle switch signal is entered.
Crankshaft position sensor signal Crankshaft position signal ON or OFFWhen crankshaft position sensor signal is
input.
Camshaft position sensor signal Camshaft position signal ON or OFFWhen camshaft position sensor signal is
entered.

EN(H4SO)-46
ENGINE (DIAGNOSTIC)
Compulsory Valve Operation Check Mode
 A list of the support data is shown in the following
table.
NOTE:
 “EGR solenoid” is not indicated but EGR sole-
noid valve is installed to the vehicle.
 The following parts will be displayed but not func-
tional because vehicle are not equipped with them.
 For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
Description Display
Compulsory fuel pump relay oper-
ation checkFuel Pump
Compulsory radiator fan relay
operation checkRadiator Fan Relay
Compulsory air conditioning relay
operation checkA/C Compressor Relay
Compulsory purge control sole-
noid valve operation checkCPC Solenoid
Display
ASV Solenoid
FICD Solenoid
Pressure switching solenoid 1
Pressure switching solenoid 2
PCV Solenoid
Vent Control Solenoid
Atmospheric pressure switching solenoid

EN(H4SO)-51
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
6 CHECK HARNESS BETWEEN COMBINA-
TION METER AND IGNITION SWITCH CON-
NECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i12) No. 9 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 7.Check the follow-
ing and repair if
necessary.
N
OTE:
Broken down
ignition relay.
 Blown out fuse
(No. 5)
 If replaced fuse
(No. 5) blows eas-
ily, check the har-
ness for short
circuit of harness
between fuse (No.
5) and ignition
relay connector.
 Open or short
circuit in harness
between fuse (No.
5) and battery ter-
minal
 Open circuit in
harness between
fuse (No. 5) and
ignition relay con-
nector
 Poor contact in
ignition relay con-
nector
 Poor contact in
ignition switch con-
nector
7 CHECK BULB.Is the malfunction indicator
light bulb OK?Repair combina-
tion meter connec-
tor.Replace the bulb. Step Check Yes No

EN(H4SO)-61
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
C: CHECK POWER SUPPLY AND GROUND LINE OF ENGINE CONTROL MOD-
ULE (ECM)
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02381
B72
3412
BATTERYIGNITION
SWITCH MAIN RELAY
SBF-4SBF-1
SBF-5
B72B61F44
B2 B1 C12 C16
B21C5
A35
A7
C26
D14B9
C10 C23
No.11B47
E2 B21 1 2 3 5 6 4
ECM
EE
1
7
4
B134
B135
B136 A :
C :
D :B137 B :
C19
8
15
16 14 13
E
3412
56
123
4
56
78
9
1011 12
1314 15 16
B137B135B21B47
MT
MT
F44
B134
12345678
1234567891011121314151617181920212223242526272829303132333435
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
4
1
53
2618 15 167891011
17 19
20121314
B136
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
A : C :D :B :
LHDLHD
RHDRHD

EN(H4SO)-62
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK MAIN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main relay.
3) Connect the battery to main relay terminals
No. 1 and No. 2.
4) Measure the resistance between main relay
terminals.
Te r m i n a l s
No. 3 — No. 5:
No. 4 — No. 6:Is the resistance less than 10
Ω?Go to step 2.Replace the main
relay.
2 CHECK GROUND CIRCUIT FOR ECM.
1) Disconnect the connector from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B134) No. 7 — Chassis ground:
(B134) No. 35 — Chassis ground:
(B135) No. 21 — Chassis ground:
(B136) No. 5 — Chassis ground:
(B136) No. 16 — Chassis ground:
(B136) No. 19 — Chassis ground: (MT
model)
(B136) No. 26 — Chassis ground:
(B137) No. 14 — Chassis ground:Is the resistance less than 5
Ω?Go to step 3.Repair open circuit
in harness
between ECM
connector and
engine ground ter-
minal.
3 CHECK INPUT VOLTAGE OF ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B135) No. 9 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 4.Repair open or
ground short cir-
cuit of power sup-
ply circuit.
4 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 10 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 5.Repair open or
ground short cir-
cuit of power sup-
ply circuit.
5 CHECK HARNESS BETWEEN ECM AND
MAIN RELAY CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B136) No. 12 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 6.Repair ground
short circuit in har-
ness between
ECM connector
and main relay
connector, then
replace the ECM.
6 CHECK OUTPUT VOLTAGE FROM ECM.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B136) No. 12 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 7.Replace the ECM.
FU(H4SO)-44,
Engine Control
Module (ECM).>
7 CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
(B47) No. 2 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 8.Repair open circuit
in harness
between ECM
connector and
main relay connec-
tor.

EN(H4SO)-63
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
8 CHECK GROUND CIRCUIT OF MAIN RE-
LAY.
1) Turn the ignition switch to OFF.
2) Measure the resistance between main relay
connector and chassis ground.
Connector & terminal
(B47) No. 1 — Chassis ground:Is the resistance less than 5
Ω?Go to step 9.Repair open circuit
between main
relay and chassis
ground.
9 CHECK INPUT VOLTAGE OF MAIN RELAY.
Measure the voltage between main relay con-
nector and chassis ground.
Connector & terminal
(B47) No. 5 (+) — Chassis ground (
−):
(B47) No. 6 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 10.Repair open or
ground short cir-
cuit in harness of
power supply cir-
cuit.
10 CHECK INPUT VOLTAGE OF ECM.
1) Connect the main relay connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 1 (+) — Chassis ground (
−):
(B135) No. 2 (+) — Chassis ground (
−):
(B136) No. 23 (+) — Chassis ground (
−):Is the voltage more than 10 V? Check ignition
control system.
EN(H4SO)-64,
IGNITION CON-
TROL SYSTEM,
Diagnostics for
Engine Starting
Fa il u r e. >Repair open or
ground short cir-
cuit in harness
between ECM
connector and
main relay connec-
tor. Step Check Yes No

EN(H4SO)-65
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
Step Check Yes No
1 CHECK IGNITION SYSTEM FOR SPARKS.
1) Remove the plug cord cap from each spark
plug.
2) Install the new spark plug on plug cord cap.
CAUTION:
Do not remove the spark plug from engine.
3) Contact the spark plug’s thread portion on
engine.
4) While opening the throttle valve fully, crank
the engine to check that spark occurs at each
cylinder.Does spark occur at each cyl-
inder?Check fuel pump
system. EN(H4SO)-67,
FUEL PUMP CIR-
CUIT, Diagnostics
for Engine Start-
ing Failure.>Go to step 2.
2 CHECK POWER SUPPLY CIRCUIT FOR IG-
NITION COIL & IGNITOR ASSY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ignition coil
& ignitor ASSY.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage between
ignition coil & ignitor ASSY connector and
engine ground.
Connector & terminal
(E12) No. 2 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 3.Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ignition coil & igni-
tor ASSY, and
main relay connec-
tor
 Poor contact in
coupling connector
 Blown out fuse
3 CHECK HARNESS OF IGNITION COIL & IG-
NITOR ASSY GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ignition
coil & ignitor ASSY connector and engine
ground.
Connector & terminal
(E12) No. 3 — Engine ground:Is the resistance less than 5
Ω?Go to step 4.Repair harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ignition coil & igni-
tor ASSY connec-
tor and engine
ground terminal
4 CHECK IGNITION COIL & IGNITOR ASSY.
1) Remove the spark plug cords.
2) Measure the resistance between spark
plug cord contact portions to check secondary
coil.
Te r m i n a l s
No. 1 — No. 2:
No. 3 — No. 4:Is the resistance 10 — 15 kΩ? Go to step 5.Replace the igni-
tion coil & ignitor
ASSY. IG(H4SO)-8, Igni-
tion Coil & Ignitor
Assembly.>
5 CHECK INPUT SIGNAL FOR IGNITION COIL
& IGNITOR ASSY.
1) Connect the connector to ignition coil &
ignitor ASSY.
2) Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor ASSY
connector and engine ground.
Connector & terminal
(E12) No. 1 (+) — Engine ground (
−):
(E12) No. 4 (+) — Engine ground (
−):Does the voltage vary more
than 10 V?Go to step 6.Replace the igni-
tion coil & ignitor
ASSY. IG(H4SO)-8, Igni-
tion Coil & Ignitor
Assembly.>

EN(H4SO)-67
ENGINE (DIAGNOSTIC)
Diagnostics for Engine Starting Failure
E: FUEL PUMP CIRCUIT
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode ERATION, Clear Memory Mode.> and Inspection Mode tion Mode.>.
WIRING DIAGRAM:
EN-02382
B72B46
R15
F44
B99
B134
R58
3412
SBF-1
No.11SBF-4
E
1
2 4
B72
F44
B61
B46
R58R57R15
SBF-5
2134
4M14 1
B134ECM
341213
4562
12345678
1234567891011121314151617181920212223242526272829303132333435
BATTERY IGNITION
SWITCH
FUEL PUMP
RELAY
FUEL PUMP
7
B99
R7
B97
R186
LHD
LHDRHD
RHD
B97
12345678
RHD
LHD
LHD
RHD
E
123
45678