SUBARU FORESTER 2004 Service Repair Manual

EN(H4SO)-203
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BE:DTC P0692 COOLING FAN 1 CONTROL CIRCUIT HIGH
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 Radiator fan does not operate properly.
 Over-heating
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.

EN(H4SO)-204
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
EN-02394
No.16
No.17
EE
SBF-4
SBF-1
F17
B134 ECM
14
13F16
F16B72F2 : LHDF27
F17
3412
1
2
SUB FAN
MOTOR
M
1
2
MAIN FAN
MOTOR
M
BATTERY
IGNITION
SWITCHB72
41
21
1234 5678910 11 12 13 14 15 16 17 18 19 20
B134
1234567891011121314151617181920212223242526272829303132333435
3132333435
36
56789
1011121314
1516171819
2021222324
2526272829
1230
34
20A
F27 FAN
MODE
RELAY
AIR CONDITIONING RELAY HOLDER
MAIN
FAN
RELAY-1 SUB
FAN
RELAY
20A
29
25
27
28
30
34
32
317
5
9
2
1
4
3 8 6
B100F2
LHD MODEL : 10
RHD MODEL : 71
LHD MODEL : 11
RHD MODEL : 19
2
*
*
1*
2*
F2 : RHD
12345 678910
11
1219 20 21
13 14 151617
18 22

EN(H4SO)-205
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to OFF.
2) Connect the test mode connector at the
lower portion of instrument panel (on the
driver’s side).
3) Turn the ignition switch to ON.
4) While operating the radiator fan relay, mea-
sure the voltage between ECM and chassis
ground.
N
OTE:
Radiator fan relay operation can be executed
using Subaru Select Monitor. For procedure,
refer to “Compulsory Valve Operation Check
Mode”. <Ref. to EN(H4SO)-45, Compulsory
Valve Operation Check Mode.>
Connector & terminal
(B134) No. 14 (+) — Chassis ground (
−):
(B134) No. 13 (+) — Chassis ground (
−):Is the voltage 0 — 10 V? Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair poor
contact in ECM
connector.Go to step 2.
2 CHECK SHORT CIRCUIT IN RADIATOR FAN
RELAY CONTROL CIRCUIT.
1) Turn the ignition switch to OFF.
2) Remove the main fan relay and sub fan
relay. (model with A/C)
3) Disconnect the test mode connectors
4) Turn the ignition switch to ON.
5) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 14 (+) — Chassis ground (
−):
(B134) No. 13 (+) — Chassis ground (
−):Is the voltage more than 10 V? Repair battery
short circuit in
radiator fan relay
control circuit.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>Go to step 3.
3 CHECK MAIN FAN RELAY.
1) Turn the ignition switch to OFF.
2) Remove the main fan relay.
3) Measure the resistance between main fan
relay terminals.
Te r m i n a l s
No. 30 — No. 31:Is the resistance less than 1
Ω?Replace the main
fan relay and
ECM. <Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>Go to step 4.
4 CHECK SUB FAN RELAY.
1) Remove the sub fan relay.
2) Measure the resistance between sub fan
relay terminals.
Te r m i n a l s
No. 28 — No. 29:Is the resistance less than 1
Ω?Replace the sub
fan relay and
ECM. <Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>Go to step 5.
5 CHECK POOR CONTACT.
Check poor contact in ECM connector.Is there poor contact in ECM
connector?Repair the poor
contact in ECM
connector.Replace the ECM.
<Ref. to
FU(H4SO)-44,
Engine Control
Module (ECM).>

EN(H4SO)-206
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BF:DTC P0703 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
EN-02398
BATTERY
B65
34
12
TO STOP LIGHTS
SBF-1SBF-2No.16
B65 BRAKE
LIGHT
SWITCH
2
3
B64 BRAKE
LIGHT
SWITCH
1
B64
12
B55
B55
12
TCM
2
1
2
2
1
2
1: WITH CRUISE CONTROL
: WITHOUT CRUISE CONTROL
12
789 56 3410 11 12
19 20 2113 14 15 16 17 18
22
23
24

EN(H4SO)-207
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK OPERATION OF BRAKE LIGHT.Does the brake light come on
when depressing the brake
pedal?Go to step 2.Repair or replace
the brake light cir-
cuit.
2 CHECK HARNESS BETWEEN TCM AND
BRAKE LIGHT SWITCH CONNECTOR.
1) Disconnect the connectors from TCM and
brake light switch.
2) Measure the resistance of harness
between TCM and brake light switch connec-
tor.
Connector & terminal
WITHOUT CRUISE CONTROL
(B55) No. 12 — (B64) No. 2:
WITH CRUISE CONTROL
(B55) No. 12 — (B65) No. 3:Is the resistance less than 1
Ω?Go to step 3.Repair or replace
the harness and
connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
TCM and brake
light switch con-
nector
 Poor contact in
TCM connector
 Poor contact in
brake light switch
connector
3 CHECK HARNESS BETWEEN TCM AND
BRAKE LIGHT SWITCH CONNECTOR.
Measure the resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 12 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 4.Repair ground
short circuit in har-
ness between
TCM and brake
light switch con-
nector.
4 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connectors to TCM and brake
light switch.
2) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 12 (+) — Chassis ground (
−):Is the voltage less than 1 V
when releasing the brake
pedal?Go to step 5.Adjust or replace
the brake light
switch. <Ref. to LI-
8, STOP LIGHT
SWITCH,
INSPECTION,
Stop Light Sys-
tem.>
5 CHECK INPUT SIGNAL FOR TCM.
Measure the voltage between TCM and chas-
sis ground.
Connector & terminal
(B55) No. 12 (+) — Chassis ground (
−):Is the voltage more than 10 V
when depressing the brake
pedal?Go to step 6.Adjust or replace
the brake light
switch. <Ref. to LI-
8, STOP LIGHT
SWITCH,
INSPECTION,
Stop Light Sys-
tem.>
6 CHECK POOR CONTACT.
Check poor contact in TCM connector.Is there poor contact in TCM
connector?Repair poor con-
tact in TCM con-
nector.Replace the TCM.
<Ref. to 4AT-77,
Transmission Con-
trol Module
(TCM).>

EN(H4SO)-208
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BG:DTC P0731 GEAR 1 INCORRECT RATIO
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)-209, DTC P0734 GEAR 4 INCOR-
RECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
BH:DTC P0732 GEAR 2 INCORRECT RATIO
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)-209, DTC P0734 GEAR 4 INCOR-
RECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
BI: DTC P0733 GEAR 3 INCORRECT RATIO
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H4SO)-209, DTC P0734 GEAR 4 INCOR-
RECT RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

EN(H4SO)-209
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BJ:DTC P0734 GEAR 4 INCORRECT RATIO
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 Shift point too high or too low.
 Engine brake not effected in 3rd range.
 Excessive shift shock.
 Excessive tight corner braking.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-72, List
of Diagnostic Trou-
ble Code (DTC).>Go to step 2.
2 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check the throttle position sensor circuit. <Ref.
to 4AT(H4SO)-41, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>Is there any trouble in throttle
position sensor circuit?Repair or replace
the throttle posi-
tion sensor circuit.Go to step 3.
3 CHECK FRONT VEHICLE SPEED SENSOR
CIRCUIT.
Check front vehicle speed sensor circuit. <Ref.
to 4AT(H4SO)-45, DTC 33 FRONT VEHICLE
SPEED SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>Is there any trouble in front
vehicle speed sensor circuit?Repair or replace
the front vehicle
speed sensor cir-
cuit.Go to step 4.
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to 4AT(H4SO)-49, DTC 36
TORQUE CONVERTER TURBINE SPEED
SENSOR, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>Is there any trouble in torque
converter turbine speed sensor
circuit?Repair or replace
the torque con-
ver ter turbine
speed sensor cir-
cuit.Go to step 5.
5 CHECK POOR CONTACT.
Check poor contact in TCM connector.Is there poor contact in TCM
connector?Repair poor con-
tact in TCM con-
nector.Go to step 6.
6 CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.Is there any mechanical trou-
ble in automatic transmission?Repair or replace
the automatic
transmission.
<Ref. to 4AT-32,
INSPECTION,
Road Test.>Replace the TCM.
<Ref. to 4AT-77,
Transmission Con-
trol Module
(TCM).>

EN(H4SO)-210
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BK:DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR
STUCK OFF
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 No lock-up (after engine warm-up)
 No shift or excessive tight corner “braking”
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Is any other DTC displayed? Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-72, List
of Diagnostic Trou-
ble Code (DTC).>Go to step 2.
2 CHECK LOCK-UP DUTY SOLENOID CIR-
CUIT.
Check lock-up duty solenoid circuit. <Ref. to
4AT(H4SO)-74, DTC 77 LOCK-UP DUTY
SOLENOID, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>Is there any trouble in lock-up
duty solenoid circuit?Repair or replace
the lock-up duty
solenoid circuit.Go to step 3.
3 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check the throttle position sensor circuit. <Ref.
to 4AT(H4SO)-41, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>Is there any trouble in throttle
position sensor circuit?Repair or replace
the throttle posi-
tion sensor circuit.Go to step 4.
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to 4AT(H4SO)-49, DTC 36
TORQUE CONVERTER TURBINE SPEED
SENSOR, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>Is there any trouble in torque
converter turbine speed sensor
circuit?Repair or replace
the torque con-
ver ter turbine
speed sensor cir-
cuit.Go to step 5.
5 CHECK ENGINE SPEED INPUT CIRCUIT.
Check engine speed input circuit. <Ref. to
4AT(H4SO)-36, DTC 11 ENGINE SPEED SIG-
NAL, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>Is there any trouble in engine
speed input circuit?Repair or replace
the engine speed
input circuit.Go to step 6.
6 CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit. <Ref. to
4AT(H4SO)-95, CHECK INHIBITOR SWITCH,
Diagnostic Procedure without Diagnostic Trou-
ble Code (DTC).>Is there any trouble in inhibitor
switch circuit?Repair or replace
the inhibitor switch
circuit.Go to step 7.
7 CHECK BRAKE LIGHT SWITCH CIRCUIT.
Check brake light switch circuit. <Ref. to
4AT(H4SO)-88, CHECK BRAKE SWITCH,
Diagnostic Procedure without Diagnostic Trou-
ble Code (DTC).>Is there any trouble in brake
light switch circuit?Repair or replace
the brake light
switch circuit.Go to step 8.

EN(H4SO)-211
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
8 CHECK ATF TEMPERATURE SENSOR CIR-
CUIT.
Check ATF temperature sensor circuit. <Ref. to
4AT(H4SO)-38, DTC 27 ATF TEMPERA-
TURE SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>Is there any trouble in ATF tem-
perature sensor circuit?Repair or replace
the ATF tempera-
ture sensor circuit.Go to step 9.
9 CHECK POOR CONTACT.
Check poor contact in TCM connector.Is there poor contact in TCM
connector?Repair poor con-
tact in TCM con-
nector.Go to step 10.
10 CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.Is there any mechanical trou-
ble in automatic transmission?Repair or replace
the automatic
transmission.
<Ref. to 4AT-32,
INSPECTION,
Road Test.>Replace the TCM.
<Ref. to 4AT-77,
Transmission Con-
trol Module
(TCM).> Step Check Yes No

EN(H4SO)-212
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BL:DTC P0851 NEUTRAL SWITCH INPUT CIRCUIT LOW
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
Erroneous idling
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4SO)-44, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-37, OPERATION, Inspec-
tion Mode.>.
WIRING DIAGRAM:
EN-00282
B12T3
B14
T7INHIBITOR SWITCH
STARTER MOTOR
PRND321
12
7
12
11
B12
T7
123456789101112
123
4
56
78
9
1011 12
B136ECM
21
16
E2
B21MT
AT
NEUTRAL
POSITION
SWITCH
12
B25
B21
12345678910111213141516
B136
5
2
84
3923 20 211011
221617
24
2512136
261915
14
1
7
18
B25
T2
B25
T212
LHD
LHDRHD
RHD
B25B25
T221
LHD
LHDRHD
RHD T2