2004 SUBARU FORESTER display

EN(H4DOTC 2.5)-159
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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)”. EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).>
N
OTE:
In this case, it is
not necessary to
inspect DTC
P0519.Go to step 2.
2 CHECK AIR INTAKE SYSTEM.
1) Turn the ignition switch to ON.
2) Start and idle the engine.
3) Check the following items:
 Loose installation of intake manifold and
throttle body
 Cracks of intake manifold gasket and throttle
body gasket
 Disconnections of vacuum hosesIs there any fault in air intake
system?Repair air suction
and leaks.Go to step 3.
3 CHECK ELECTRONIC THROTTLE CON-
TROL.
1) Turn the ignition switch to OFF.
2) Replace the electronic throttle control.
3) Check the electronic throttle control.Are foreign matters found
inside the electronic throttle
control?Remove foreign
matters from the
electronic throttle
control.Perform the diag-
nosis of DTC
P2101.

EN(H4DOTC 2.5)-166
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
TCM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from TCM.
4) Measure the resistance between ECM and
TCM connectors.
Connector & terminal
(B137) No. 18 — (B55) No. 3:
(B137) No. 26 — (B55) No. 12:Is the resistance less than 1
Ω?Go to step 2.Repair the harness
and connector.
2 CHECK HARNESS BETWEEN ECM AND
TCM.
Measure the resistance between ECM connec-
tor and chassis ground.
Connector & terminal
(B137) No. 18 — Chassis ground:
(B137) No. 26 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 3.Repair the harness
and connector.
3 CHECK HARNESS BETWEEN ECM AND
TCM.
Check the resistance between ECM connec-
tors.
Connector & terminal
(B137) No. 18 — (B137) No. 26:Is the resistance more than 1
MΩ?Go to step 4.Repair the harness
and connector.
4 CHECK AT SYSTEM CONDITION.
Perform the diagnosis for AT using Subaru
Select Monitor.Is DTC P1718 displayed? Check AT system. Replace the ECM.

EN(H4DOTC 2.5)-168
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P0604?Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>Temporary poor
contact occurs.
EN-02356
B72
B135
3412
BATTERY MAIN RELAY
SBF-4 SBF-1SBF-5
B72
D16 D7
B12
A6
A7
B1
B4
D1
D2
A34B5
B6
B19
D14
No.11
B47
E2 B21 1 2 3 5 6 4
ECM
E
E
1 4
B134
B135
B137 A:
B:
D:
14133
15
16
34 12
56123
4
56
78
91011 12
1314 15 16
B134 B21 B47B137 A: D:
B: IGNITION
SWITCH
56 7
82 1
94 310
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31
567
82 1
94 310
24 22 23 2511 12 13 14 15
26 27
2816 17 18 19
20 21
29 30 31 32 33 34 35
567
82 1
94 310
22 23 11 12 13 14 15
24 25
2616 17
18 19 20 21
27 28 29 30 31

EN(H4DOTC 2.5)-197
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of tumble generator valve
position sensor signal using Subaru Select
Monitor or OBD-II general scan tool.
N
OTE:
 Subaru Select Monitor
For detailed operation procedure, refer to “READ
CURRENT DATA SHOWN ON DISPLAY FOR
ENGINE”. aru Select Monitor.>
 OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the voltage more than 4.9 V? Go to step 2.Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector
may be the cause.
N
OTE:
In this case repair
the following:
 Poor contact in
tumble generator
valve position sen-
sor connector
 Poor contact in
ECM connector.
 Poor contact in
coupling connector
2 CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from throttle
position sensor.
3) Measure the resistance of harness
between tumble generator valve position sen-
sor connector and engine ground.
Connector & terminal
(E54) No. 2 — Engine ground:Is the resistance less than 5
Ω?Go to step 3.Repair the harness
and connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
tumble generator
valve position sen-
sor and ECM con-
nector
 Poor contact in
coupling connector
 Poor contact in
joint connector
3 CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
AND ECM CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between throttle posi-
tion sensor connector and engine ground.
Connector & terminal
(E54) No. 3 (+) — Engine ground (
−):Is the voltage more than 4.9 V? Repair battery
short circuit in har-
ness between tum-
ble generator valve
position sensor
and ECM connec-
tor. After repair,
replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>Replace the tum-
ble generator valve
assembly. FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>

EN(H4DOTC 2.5)-198
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BF:DTC P1090 TUMBLE GENERATED VALVE SYSTEM 1 (VALVE OPEN)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection Mode.>.
BG:DTC P1091 TUMBLE GENERATED VALVE SYSTEM 1 (VALVE CLOSE)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection 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)”. EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).>Go to step 2.
2 CHECK TUMBLE GENERATOR VALVE RH
1) Remove the tumble generator valve assembly.
2) Check tumble generator valve body.Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)Replace the tum-
ble generator valve
assembly. FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Clean tumble gen-
erator valve.
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)”. EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).>Go to step 2.
2 CHECK TUMBLE GENERATOR VALVE RH
1) Remove the tumble generator valve assembly.
2) Check tumble generator valve body.Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)Replace the tum-
ble generator valve
assembly. FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Clean tumble gen-
erator valve.

EN(H4DOTC 2.5)-199
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BH:DTC P1092 TUMBLE GENERATED VALVE SYSTEM 2 (VALVE OPEN)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection 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)”. EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).>Go to step 2.
2 CHECK TUMBLE GENERATOR VALVE RH
1) Remove the tumble generator valve assembly.
2) Check tumble generator valve body.Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)Replace the tum-
ble generator valve
assembly. FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Clean tumble gen-
erator valve.

EN(H4DOTC 2.5)-200
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BI: DTC P1093 TUMBLE GENERATED VALVE SYSTEM 2 (VALVE CLOSE)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection 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)”. EN(H4DOTC 2.5)-
65, List of Diag-
nostic Trouble
Code (DTC).>Go to step 2.
2 CHECK TUMBLE GENERATOR VALVE RH
1) Remove the tumble generator valve assembly.
2) Check tumble generator valve body.Does the tumble generator
valve move smoothly? (No dirt
or foreign materials clogged)Replace the tum-
ble generator valve
assembly. FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Clean tumble gen-
erator valve.

EN(H4DOTC 2.5)-209
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BN:DTC P1110 ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION
(LOW INPUT)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection Mode.>.
BO:DTC P1111 ATMOSPHERIC PRESSURE SENSOR CIRCUIT MALFUNCTION
(HIGH INPUT)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection Mode.>.
BP:DTC P1160 RETURN SPRING FAILURE
NOTE:
For diagnostic procedure, refer to DTC P2101. TUATOR CONTROL MOTOR CIRCUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P1110?Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
N
OTE:
Atmospheric pres-
sure sensor is built
in ECM.Temporary poor
contact occurs.
Step Check Yes No
1 CHECK ANY OTHER DTC ON DISPLAY.Does the Subaru Select Moni-
tor or OBD-II general scan tool
indicate DTC P1111?Replace the ECM.
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>
N
OTE:
Atmospheric pres-
sure sensor is built
in ECM.Temporary poor
contact occurs.