Subaru Forester 2004 Service Manual page 185

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTIC)
Step
1 CHECK INPUT SIGNAL FROM ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground with select lever at "N" and "P"
ranges.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
2 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground with select lever at except "N" and
"P" ranges.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
3 CHECK POOR CONTACT.
Check poor contact in ECM connector.
4 CHECK INPUT SIGNAL FROM ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 9 (+) — Chassis ground (
5 CHECK HARNESS BETWEEN ECM AND IN-
HIBITOR SWITCH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and
inhibitor switch.
3) Measure the resistance of harness
between ECM and inhibitor switch connector.
Connector & terminal
(B137) No. 9 — (T7) No. 12:
Check
Is the voltage less than 1 V?
−
):
Is the voltage 4.5 — 5.5 V?
−
):
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair the battery
−
):
Is the resistance less than 1
Ω?
EN(H4DOTC 2.5)-184
Yes
Go to step 2. Go to step 4.
Go to step 3. Go to step 4.
Repair the poor Contact the SUB-
contact in ECM ARU dealer.
connector.
NOTE:
Inspection by DTM
is required, because
probable cause is
deterioration of mul-
tiple parts.
Go to step 5.
short circuit in har-
ness between
ECM and inhibitor
switch connector.
Go to step 6. Repair harness
and connector.
NOTE:
In this case repair
the following:
• Open circuit in
harness between
ECM and inhibitor
switch connector.
• Poor contact in
coupling connector
• Poor contact in
inhibitor switch
connector
• Poor contact in
ECM connector.
No