2004 SUBARU FORESTER Service Repair Manual

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Page 1881 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-248
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
BZ:DTC P1086 TUMBLE GENERATED VALVE POSITION SENSOR 2 CIRCUIT
LOW
DTC DETECTING CONDITION:
Immediately at fa

Page 1882 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-249
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
RHD model
EN-02344
E3
E50
B22
B122
1
32
20
1018
1 2
B136 ECM
16
35 26
B136
E50
123
B22
125678
13141516910111

Page 1883 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-250
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 throttle position sensor
si

EN(H4DOTC)-250
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 throttle 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 DIS-
PLAY FOR ENGINE”. 33, Subaru Select Monitor.>
OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.Is the voltage less than 0.1 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
throttle position
sensor connector
Poor contact in
ECM connector.
Poor contact in
coupling connector
2 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground while tumble generator
valve is fully closed.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (
−):Is the voltage more than 4.5 V? Go to step 4.Go to step 3.
3 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 16 (+) — Chassis ground (
−):Does the voltage change by
shaking the harness and con-
nector of ECM while monitor-
ing the value with voltage
meter?Repair the poor
contact in ECM
connector.Contact the SUB-
ARU dealer.
N
OTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.
4 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(B136) No. 26 (+) — Chassis ground (
−):Is the voltage less than 0.1 V? Go to step 6.Go to step 5.
5 CHECK INPUT SIGNAL FOR ECM (WITH
SUBARU SELECT MONITOR).
Measure the voltage between ECM connector
and chassis ground.Does the voltage change by
shaking the harness and con-
nector of ECM while monitor-
ing the value with Subaru
Select Monitor?Repair the poor
contact in ECM
connector.Go to step 6.

Page 1884 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-251
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
6 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition swit

EN(H4DOTC)-251
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
6 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from tumble gen-
erator valve position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between tumble gen-
erator valve position sensor connector and
engine ground.
Connector & terminal
(E50) No. 1 (+) — Engine ground (
−):Is the voltage more than 4.5 V? Go to step 7.Repair the har-
ness and connec-
tor.
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
tumble generator
valve position sen-
sor connector
Poor contact in
ECM connector.
Poor contact in
coupling connector
Poor contact in
joint connector
7 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness
between ECM connector and tumble generator
valve position sensor connector.
Connector & terminal
(B136) No. 26 — (E50) No. 3:Is the resistance less than 1
Ω?Go to step 8.Repair the har-
ness and connec-
tor.
NOTE:
In this case repair
the following:
Open circuit in
harness between
tumble generator
valve position sen-
sor and ECM con-
nector
Poor contact in
ECM connector.
Poor contact in
tumble generator
valve position sen-
sor connector
Poor contact in
coupling connector
8 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
Measure the resistance of harness between
tumble generator valve position sensor con-
nector and engine ground.
Connector & terminal
(E50) No. 3 — Engine ground:Is the resistance more than 1
MΩ?Go to step 9.Repair ground
short circuit in har-
ness between tum-
ble generator valve
position sensor
and ECM connec-
tor.
9 CHECK POOR CONTACT.
Repair poor contact in tumble generator valve
position sensor connector.Is there poor contact in tumble
generator valve position sen-
sor connector?Repair the poor
contact in tumble
generator valve
position sensor
connector.Replace the tum-
ble generator valve
assembly. FU(H4DOTC)-42,
Tu m b l e G e n e r a t o r
Valve Assembly.> Step Check Yes No

Page 1885 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-252
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CA:DTC P1087 TUMBLE GENERATED VALVE POSITION SENSOR 2 CIRCUIT
HIGH
DTC DETECTING CONDITION:
Immediately at f

Page 1886 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-253
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
RHD model
EN-02344
E3
E50
B22
B122
1
32
20
1018
1 2
B136 ECM
16
35 26
B136
E50
123
B22
125678
13141516910111

Page 1887 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-254
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 throttle position sensor
si

EN(H4DOTC)-254
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 throttle 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 DIS-
PLAY FOR ENGINE”. 33, Subaru 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 throttle position sensor connector and
engine ground.
Connector & terminal
(E50) No. 2 — Engine ground:Is the resistance less than 5
Ω?Go to step 3.Repair the har-
ness and connec-
tor.
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 THROTTLE
POSITION SENSOR AND ECM CONNEC-
TOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between throttle posi-
tion sensor connector and engine ground.
Connector & terminal
(E50) 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)-50,
Engine Control
Module (ECM).>Replace the tum-
ble generator valve
assembly. FU(H4DOTC)-42,
Tu m b l e G e n e r a t o r
Valve Assembly.>

Page 1888 of 2870

SUBARU FORESTER 2004 Service Repair Manual EN(H4DOTC)-255
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
CB:DTC P1088 TUMBLE GENERATED VALVE POSITION SENSOR 1 CIRCUIT
LOW
DTC DETECTING CONDITION:
Immediately at fa

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