Subaru Forester 2004 Service Manual page 196

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 CHECK HARNESS BETWEEN ECM AND
TUMBLE GENERATOR VALVE POSITION
SENSOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from throttle
position sensor.
3) Turn the ignition switch to ON.
4) Measure the voltage between throttle posi-
tion sensor connector and engine ground.
Connector & terminal
(E54) No. 1 (+) — Engine ground (
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 throttle position
sensor connector.
Connector & terminal
(B136) No. 27 — (E54) No. 3:
8 CHECK HARNESS BETWEEN ECM AND
THROTTLE POSITION SENSOR CONNEC-
TOR.
Measure the resistance of harness between
tumble generator valve position sensor con-
nector and engine ground.
Connector & terminal
(E54) No. 3 — Engine ground:
9 CHECK POOR CONTACT.
Repair poor contact in tumble generator valve
position sensor connector.
Check
Is the voltage more than 4.5 V? Go to step 7.
−
):
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is there poor contact in tumble
generator valve position sen-
sor connector?
EN(H4DOTC 2.5)-195
ENGINE (DIAGNOSTIC)
Yes
Repair the harness
and connector.
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
throttle position
sensor connector
• Poor contact in
ECM connector.
• Poor contact in
coupling connector
• Poor contact in
joint connector
Go to step 8. Repair the harness
and connector.
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
Go to step 9. Repair ground
short circuit in har-
ness between tum-
ble generator valve
position sensor and
ECM connector.
Repair the poor Replace the tum-
contact in tumble ble generator valve
generator valve assembly. <Ref. to
position sensor FU(H4DOTC 2.5)-
connector. 33, Tumble Gener-
ator Valve Assem-
bly.>
No