2004 SUBARU FORESTER check engine

IDI-4
INSTRUMENTATION/DRIVER INFO
Combination Meter System
B: INSPECTION
CAUTION:
When measuring voltage and resistance of the ECM, TCM, or each sensor, use a tapered pin with a
diameter of less than 0.64 mm (0.025 in) in order to avoid poor contact. Do not insert the pin more
than 2 mm (0.08 in).
1. SYMPTOM CHART
Symptom Repair order Reference
Combination meter assembly does not operate. (1) Power supply
(2) Ground circuit POWER SUPPLY AND
GROUND CIRCUIT,
INSPECTION, Combi-
nation Meter System.>
Speedometer does not operate. (1) (MT model) Vehicle speed sensor
(AT model) TCM
(2) Harness
(3) SpeedometerMT model: 5, CHECK VEHICLE
SPEED SENSOR,
INSPECTION, Combi-
nation Meter System.>
AT model: 6, CHECK TRANSMIS-
SION CONTROL MOD-
ULE (TCM),
INSPECTION, Combi-
nation Meter System.>
Tachometer does not operate. (1) ECM
(2) Harness
(3) Tachometer ENGINE CONTROL
MODULE (ECM),
INSPECTION, Combi-
nation Meter System.>
Fuel gauge does not operate. (1) Fuel level sensor
(2) Harness
(3) Fuel gauge FUEL LEVEL SEN-
SOR, INSPECTION,
Combination Meter
System.>
Water temperature gauge does not operate. (1) Engine coolant temperature sensor
(2) Harness
(3) Water temperature gauge ENGINE COOLANT
TEMPERATURE SEN-
SOR, INSPECTION,
Combination Meter
System.>
Outside temperature indicator does not operate. (1) Ambient sensor
(2) Harness
(3) Combination meter OUTSIDE TEMPERA-
TURE INDICATOR,
INSPECTION, Combi-
nation Meter System.>

IDI-5
INSTRUMENTATION/DRIVER INFO
Combination Meter System
2. CHECK POWER SUPPLY AND GROUND CIRCUIT
3. CHECK VEHICLE SPEED SENSOR
Step Check Yes No
1 CHECK POWER SUPPLY FOR COMBINA-
TION METER.
1) Remove the combination meter. IDI-10, REMOVAL, Combination Meter
Assembly.>
2) Disconnect the combination meter harness
connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 9 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 2.Check the harness
for open or short
between ignition
switch and combi-
nation meter.
2 CHECK POWER SUPPLY FOR COMBINA-
TION METER.
Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 8 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 3.Check the harness
for open or short
between fuse and
combination
meter.
3 CHECK GROUND CIRCUIT OF COMBINA-
TION METER.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between combination meter connector and
chassis ground.
Connector & terminal
(i10) No. 10 — Chassis ground:Is the resistance less than 10
Ω?Replace the com-
bination meter
printed circuit.Repair the wiring
harness.
Step Check Yes No
1 CHECK VEHICLE SPEED SENSOR.
1) Lift-up the vehicle and support it with rigid
racks.
2) Remove the combination meter with har-
ness connector.
3) Drive the vehicle at a speed greater than 20
km/h (12 MPH).
Warning:
Be careful not to get caught in the running
wheels.
4) Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 12 (+) — Chassis ground (
−):Is the voltage 1 V ← → 5 V? Check the speed-
ometer. IDI-13, INSPEC-
TION, Speedome-
ter.>Go to step 2.
2 CHECK VEHICLE SPEED SENSOR POWER
SUPPLY.
1) Turn the ignition switch to OFF.
2) Disconnect the vehicle speed sensor har-
ness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between vehicle
speed sensor connector and engine ground.
Connector & terminal
(B17) No. 3 (+) — Engine ground (
−):Is the voltage more than 10 V? Go to step 3.Check the harness
for open or short
between ignition
switch and vehicle
speed sensor.

IDI-6
INSTRUMENTATION/DRIVER INFO
Combination Meter System
4. CHECK TRANSMISSION CONTROL MODULE (TCM)
3 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between vehicle
speed sensor connector and engine ground.
Connector & terminal
(B17) No. 2 — Engine ground:Is the resistance less than 10
Ω?Go to step 4.Repair the wiring
harness.
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND COMBINATION
METER.
1) Disconnect the connector from combination
meter.
2) Measure the resistance between vehicle
speed sensor harness connector and combi-
nation meter harness connector.
Connector & terminal
(B17) No. 1 — (i10) No. 12:Is the resistance less than 10
Ω?Replace the vehi-
cle speed sensor.Repair the wiring
harness.
Step Check Yes No
1 CHECK TCM SIGNAL.
1) Lift-up the vehicle and support it with rigid
racks.
2) Drive the vehicle faster than 10 km/h (6
MPH).
Warning:
Be careful not to get caught in the running
wheels.
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B56) No. 17 (+) — Chassis ground (
−):Is the voltage 1 V ← → 5 V? Go to step 2.Check TCM. to 4AT(H4SO)-2,
Basic Diagnostic
Procedure.>
2 CHECK HARNESS BETWEEN TCM AND
COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and
combination meter.
3) Measure the resistance between TCM har-
ness connector and combination meter har-
ness connector.
Connector & terminal
(B56) No. 17 — (i10) No. 12:Is the resistance less than 10
Ω?Check the speedo
meter. 13, INSPECTION,
Speedometer.>Repair the wiring
harness. Step Check Yes No

IDI-7
INSTRUMENTATION/DRIVER INFO
Combination Meter System
5. CHECK ENGINE CONTROL MODULE (ECM)
6. CHECK FUEL LEVEL SENSOR
Step Check Yes No
1 CHECK ECM SIGNAL.
1) Start the engine.
2) Measure the voltage between ECM con-
nector and engine ground.
Connector & terminal
Non-turbo model
(B134) No. 10 (+) — Engine ground (
−):
Turbo model
(B134) No. 23 (+) — Engine ground (
−):Is the voltage 0 V ← → 14 V? Go to step 2.Check ECM. to EN(H4SO)-2,
Basic Diagnostics
Procedure.> to EN(H4DOTC)-2,
Basic Diagnostics
Procedure.>
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
combination meter.
3) Measure the resistance between ECM har-
ness connector and combination meter har-
ness connector.
Connector & terminal
Non-turbo model
(B134) No. 10 — (i10) No. 11:
Turbo model
(B134) No. 23 — (i10) No. 11:Is the resistance less than 10
Ω?Check the tachom-
eter. 14, INSPECTION,
Tachometer.>Repair the wiring
harness.
Step Check Yes No
1 CHECK FUEL LEVEL SENSOR.
1) Remove the fuel level sensor. FU(H4SO)-57, REMOVAL, Fuel Level Sen-
sor.>
2) Measure the resistance between fuel level
sensor terminals when setting the float to
FULL and EMPTY position.
Te r m i n a l s
No. 3 — No. 5:Is the resistance 0.5 to 2.5 Ω
(FULL) and 50 to 52 Ω
(EMPTY)?Go to step 2.Replace the fuel
level sensor.
2 CHECK FUEL SUB LEVEL SENSOR.
1) Remove the fuel sub level sensor. FU(H4SO)-58, REMOVAL, Fuel Sub Level
Sensor.>
2) Measure the resistance between fuel sub
level sensor terminals when setting the float to
FULL and EMPTY position.
Te r m i n a l s
No. 1 — No. 2:Is the resistance 0.5 to 2.5 Ω
(FULL) and 42 to 44 Ω
(EMPTY)?Go to step 3.Replace the fuel
sub level sensor.
3 CHECK HARNESS BETWEEN FUEL SUB
LEVEL SENSOR AND COMBINATION
METER.
1) Disconnect the connector from combination
meter.
2) Measure the resistance between fuel sub
level sensor harness connector terminal and
combination meter harness connector termi-
nal.
Connector & terminal
(R59) No. 1 — (i11) No. 1:Is the resistance less than 10
Ω?Go to step 4.Repair the wiring
harness.

IDI-8
INSTRUMENTATION/DRIVER INFO
Combination Meter System
7. CHECK ENGINE COOLANT TEMPERATURE SENSOR
8. CHECK OUTSIDE TEMPERATURE INDICATOR
4 CHECK HARNESS BETWEEN FUEL LEVEL
SENSOR AND FUEL SUB LEVEL SENSOR.
Measure the resistance between fuel level sen-
sor harness connector terminal and fuel sub
level sensor harness connector terminal.
Connector & terminal
(R58) No. 3 — (R59) No. 2:Is the resistance less than 10
Ω?Go to step 5.Repair the wiring
harness.
5 CHECK FUEL LEVEL SENSOR GROUND
CIRCUIT.
Measure the resistance between fuel level sen-
sor harness connector terminal and chassis
ground.
Connector & terminal
(R58) No. 5 — Chassis ground:Is the resistance less than 10
Ω?Check the fuel
gauge. IDI-15, INSPEC-
TION, Fuel
Gauge.>Repair the wiring
harness.
Step Check Yes No
1 CHECK ENGINE COOLANT TEMPERATURE
SENSOR.
Check the engine coolant temperature sensor.
cedure.>Is the engine coolant tempera-
ture sensor OK?Go to step 2.Replace the
engine coolant
temperature sen-
sor.
2 CHECK HARNESS BETWEEN ENGINE
COOLANT TEMPERATURE SENSOR AND
COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from engine cool-
ant temperature sensor and combination
meter.
3) Measure the resistance between engine
coolant temperature sensor harness connector
and combination meter harness connector.
Connector & terminal
(E8) No. 3 — (i11) No. 10:Is the resistance less than 10
Ω?Go to step 3.Repair the wiring
harness.
3 CHECK WATER TEMPERATURE GAUGE
GROUND CIRCUIT.
Measure the resistance between combination
meter harness connector terminal and chassis
ground.
Connector & terminal
(i11) No. 9 — Chassis ground:Is the resistance less than 10
Ω?Check the water
temperature
gauge. IDI-16, INSPEC-
TION, Water Tem-
perature Gauge.>Repair the wiring
harness.
Step Check Yes No
1 CHECK POWER SUPPLY FOR AMBIENT
SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from outside
temperature sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between outside tem-
perature sensor harness connector terminal
and chassis ground.
Connector & terminal
(F78) No. 2 (+) — Chassis ground (
−):Is the voltage more than 4 V? Go to step 3.Go to step 2. Step Check Yes No

CC(H4SO)-8
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Cruise Control Module I/O Signal
B: WIRING DIAGRAM

Brake switch/Clutch switch
(MT model)16 Leave clutch pedal released (MT model), while cruise control main switch is
turned ON.
Then check that;
 Battery voltage is present when brake pedal is released.
 “0” volt is present when brake pedal is depressed.
Additionally only in MT model, keep the cruise control main switch to ON and
leave brake pedal released.
Then check that;
 Battery voltage is present when clutch pedal is released.
 “0” volt is present when clutch pedal is depressed.
Data link connector 17 —
Data link connector 18 —
Vehicle speed sensor (MT
model)
TCM (AT model)19 Lift-up the vehicle until all four wheels are raised off ground, and then rotate any
wheel manually.
Approx. “5” and “0” volt pulse signals are alternately input to cruise control mod-
ule.
Stop light switch 20 Turn ignition switch to OFF.
Then check that;
 Battery voltage is present when brake pedal is depressed.
 “0” volt is present when brake pedal is released.
NOTE:
Voltage at terminals 5, 7, 13 and 14 cannot be checked unless vehicle is driving by cruise control operation.Content Terminal No. Measuring conditions and I/O signals (ignition switch ON and engine idling)

CC(H4SO)-10
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Subaru Select Monitor
6) Turn the Subaru Select Monitor switch to ON.
7) On the Main Menu display screen, select the {All
System Diagnosis} and press [YES] key.
NOTE:
DTC is also shown in the {Each System Check} mode.
This mode is called up on the Cruise Control Diagnosis
screen by selecting the item {Cancel Code(s) Display}.
8) Drive the vehicle at least 30 km/h (19 MPH) with
cruise speed set.
9) If the cruise speed is canceled itself (without do-
ing any cancel operations), DTC will appear on se-
lect monitor display.
CAUTION:
 DTC will also appear when cruise cancel is ef-
fected by driver. Do not confuse.
 Have a co-worker ride in the vehicle to assist
in diagnosis during driving.
NOTE:
DTC will be cleared by turning the ignition switch or
cruise control main switch to OFF.3. REAL-TIME DIAGNOSIS
1) Connect the select monitor.
2) Turn the ignition switch and cruise control main
switch to ON.
3) Turn the Subaru Select Monitor switch to ON.
4) On the Main Menu display screen, select the
{Each System Check} and press [YES] key.
5) On the System Selection Menu display screen,
select the {Cruise Control} and press [YES] key.
6) Press the [YES] key after displayed the informa-
tion of engine type.
7) On the Cruise Control Diagnosis display screen,
select the {Current Data Display & Save} and press
[YES] key.
8) Make sure that normal indication is displayed
when controls are operated as indicated below:
 Depress/release the brake pedal. (Stop light
switch and brake switch turn ON or OFF.)
 Turn ON or OFF the “SET/COAST” switch.
 Turn ON or OFF the “RESUME/ACCEL” switch.
 Depress/release the clutch pedal. (MT model)
 Set the selector lever to P or N. (AT model)
NOTE:
 For detailed operation procedure, refer to the
SUBARU SELECT MONITOR OPERATION MAN-
UAL.
 For detailed concerning DTC, refer to the List of
Diagnostic Trouble Code (DTC).
Code (DTC).>
(1) Power switch
CC-00045
(1)

CC(H4SO)-31
CRUISE CONTROL SYSTEM (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK TRANSMISSION TYPE.Is the target MT model? Go to step 2.Go to step 6.
2 CHECK HARNESS BETWEEN BATTERY
AND VEHICLE SPEED SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
vehicle speed sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between vehicle
speed sensor harness connector terminal and
chassis ground.
Connector & terminal
(B17) No. 3 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 3.Check the harness
for open or short
between fuse relay
and vehicle speed
sensor.
3 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND VEHICLE SPEED SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
cruise control module.
3) Measure the resistance between vehicle
speed sensor harness connector terminal and
cruise control module harness connector ter-
minal.
Connector & terminal
(B17) No. 1 — (B94) No. 19:Is the resistance less than 10
Ω?Go to step 4.Repair the har-
ness.
4 CHECK HARNESS BETWEEN VEHICLE
SPEED SENSOR AND ENGINE GROUND.
1) Turn the ignition switch to OFF.
2) Measure the resistance between vehicle
speed sensor harness connector terminal and
engine ground.
Connector & terminal
(B17) No. 2 — Engine ground:Is the resistance less than 10
Ω?Go to step 5.Repair the har-
ness.
5 CHECK VEHICLE SPEED SENSOR.
1) Connect the harness connector to vehicle
speed sensor.
2) Lift-up the vehicle and support with rigid
racks.
3) Drive the vehicle at speed greater than 20
km/h (12 MPH).
Warning:
Be careful not to be caught up by the run-
ning wheels.
4) Measure the voltage between cruise control
module harness connector terminal and chas-
sis ground.
Connector & terminal
(B94) No. 19 (+) — Chassis ground (
−):Is the voltage less than 0 V ←
→ more than 5 V?Replace the cruise
control module.
Cruise Control
Module.>Replace the vehi-
cle speed sensor.
6 CHECK HARNESS BETWEEN CRUISE CON-
TROL MODULE AND TCM.
1) Turn the ignition switch to OFF.
2) Disconnect the harness connector from
TCM and cruise control module.
3) Measure the resistance between cruise
control module harness connector terminal
and TCM harness connector terminal.
Connector & terminal
(B94) No. 19 — (B56) No. 17:Is the resistance less than 10
Ω?Go to step 7.Repair the har-
ness.