SUBARU FORESTER 2004 Service Repair Manual

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”. <Ref. to EN(H4DOTC 2.5)-27, Sub-
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.
<Ref. to
FU(H4DOTC 2.5)-
41, Engine Con-
trol Module
(ECM).>Replace the tum-
ble generator valve
assembly. <Ref. to
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 <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
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 <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
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)”. <Ref. to
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. <Ref. to
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)”. <Ref. to
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. <Ref. to
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 <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
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)”. <Ref. to
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. <Ref. to
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 <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
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)”. <Ref. to
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. <Ref. to
FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Clean tumble gen-
erator valve.

EN(H4DOTC 2.5)-201
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BJ:DTC P1094 TUMBLE GENERATED VALVE SIGNAL 1 CIRCUIT MALFUNC-
TION (OPEN)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
Inspection Mode.>.
WIRING DIAGRAM:
EN-02373
E55 B22
1212
5678
13 14 15 16910 11 12
34
17 18 19 20
E3 E55
B22
B134
895
61
2
B134
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
ECM TUMBLE GENERATOR VALVE
ACTUATOR RH

EN(H4DOTC 2.5)-202
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ACTUATOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve and ECM connector.
3) Measure the resistance between tumble
generator valve actuator and ECM connector.
Connector & terminal
(E55) No. 1 — (B134) No. 9:
(E55) No. 2 — (B134) No. 8:Is the resistance less than 1
Ω?Go to step 2.Repair the open
circuit between
ECM and tumble
generator valve
connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and tumble
generator valve
actuator connec-
tor.
 Poor contact in
coupling connector
2 CHECK POOR CONTACT.
Check poor contact in tumble generator valve
actuator connector.Is there poor contact in tumble
generator valve actuator con-
nector.Repair the poor
contact in tumble
generator valve
actuator connector.Replace the tum-
ble generator valve
assembly. <Ref. to
FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>

EN(H4DOTC 2.5)-203
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BK:DTC P1095 TUMBLE GENERATED VALVE SIGNAL 1 CIRCUIT MALFUNC-
TION (SHORT)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
Inspection Mode.>.
WIRING DIAGRAM:
EN-02373
E55 B22
1212
5678
13 14 15 16910 11 12
34
17 18 19 20
E3 E55
B22
B134
895
61
2
B134
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
ECM TUMBLE GENERATOR VALVE
ACTUATOR RH

EN(H4DOTC 2.5)-204
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ACTUATOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve connector.
3) Measure the voltage between tumble gen-
erator valve actuator and chassis ground.
Connector & terminal
(E55) No. 1 (+) — Chassis ground (
−):
(E55) No. 2 (+) — Chassis ground (
−):Is the voltage less than 5 V? Replace the tum-
ble generator valve
assembly. <Ref. to
FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>Repair the battery
short circuit
between ECM and
tumble generator
valve actuator.

EN(H4DOTC 2.5)-205
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BL:DTC P1096 TUMBLE GENERATED VALVE SIGNAL 2 CIRCUIT MALFUNC-
TION (OPEN)
DTC DETECTING CONDITION:
Immediately at fault recognition
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC 2.5)-42,
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC 2.5)-35, OPERATION,
Inspection Mode.>.
WIRING DIAGRAM:
EN-02374
E51 B22
1212
5678
13 14 15 16910 11 12
34
17 18 19 20
E3 E51
B22
B134
10118
71
2
B134
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
ECM TUMBLE GENERATOR VALVE
ACTUATOR LH

EN(H4DOTC 2.5)-206
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE ACTUATOR
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve and ECM connector.
3) Measure the resistance between tumble
generator valve actuator and ECM connector.
Connector & terminal
(E51) No. 1 — (B134) No. 11:
(E51) No. 2 — (B134) No. 10:Is the resistance less than 1 Ω? Go to step 2.Repair the open
circuit between
ECM and tumble
generator valve
connector.
N
OTE:
In this case repair
the following:
 Open circuit in
harness between
ECM and tumble
generator valve
actuator connector.
 Poor contact in
coupling connector
2 CHECK POOR CONTACT.
Check poor contact in tumble generator valve
actuator connector.Is there poor contact in tumble
generator valve actuator con-
nector?Repair the poor
contact in tumble
generator valve
actuator connector.Replace the tum-
ble generator valve
assembly. <Ref. to
FU(H4DOTC 2.5)-
33, Tumble Gener-
ator Valve Assem-
bly.>