Subaru FORESTER 2001 Service Manual page 265

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (Diagnostics)
No.
1 CHECK CURRENT DATA.
1) Start engine.
2) Read data of tumble generator valve posi-
tion sensor signal using Subaru Select Moni-
tor or OBD-II general scan tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(DOHC TURBO)-36, Subaru
Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
2 CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from tumble genera-
tor valve position sensor.
3) Measure resistance of harness between
tumble generator valve position sensor con-
nector and engine ground.
Connector & terminal
(E50) No. 2 — Engine ground:
3 CHECK HARNESS BETWEEN TUMBLE
GENERATOR VALVE POSITION SENSOR
AND ECM CONNECTOR.
1) Turn ignition switch to ON.
2) Measure voltage between tumble generator
valve position sensor connector and engine
ground.
Connector & terminal
(E50) No. 3 (+) — Engine ground (−):
Step
Is the value more than 4.9
V?
Is the resistance less than
5 Ω?
Is the voltage more than
4.9 V?
EN(DOHC TURBO)-264
Check Yes
Go to step 2.
Go to step 3.
Repair battery
short circuit in
harness between
tumble generator
valve position
sensor and ECM
connector. After
repair, replace
ECM. <Ref. to
FU(DOHC
TURBO)-47,
Engine Control
Module.>
No
Even if MIL lights
up, the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector may be the
cause.
NOTE:
In this case,
repair the follow-
ing:
¼ Poor contact in
tumble generator
valve position
sensor connector
¼ Poor contact in
ECM connector
¼ Poor contact in
coupling connec-
tor
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
tumble generator
valve position
sensor and ECM
connector
¼ Poor contact in
coupling connec-
tor
¼ Poor contact in
joint connector
Replace tumble
generator valve
assembly. <Ref.
to FU(DOHC
TURBO)-40,
Tumble Generator
Valve Assembly.>