Subaru LEGACY 2006 Manual page 241

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK OUTPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (–):
2 CHECK POOR CONTACT.
Check poor contact of ECM connector.
3 CHECK HARNESS BETWEEN DRAIN
VALVE AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from drain valve
and ECM.
3) Measure the resistance of harness
between drain valve connector and chassis
ground.
Connector & terminal
(R143) No. 2 — Chassis ground:
4 CHECK HARNESS BETWEEN DRAIN
VALVE AND ECM CONNECTOR.
Measure the resistance of harness between
ECM and drain valve connector.
Connector & terminal
(B136) No. 17 — (R143) No. 2:
5 CHECK DRAIN VALVE.
Measure the resistance between drain valve
terminals.
Terminals
No. 1 — No. 2:
Check
Is the voltage more than 10 V? Go to step 2.
Is there poor contact in ECM
connector?
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance between 10
and 100 Ω?
EN(H4SO)(diag)-204
Yes No
Go to step 3.
Repair the poor Even if the mal-
contact of ECM function indicator
connector. light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. (How-
ever, the possibility
of poor contact still
remains.)
NOTE:
In this case, repair
the following item:
• Poor contact in
drain valve con-
nector
• Poor contact in
ECM connector
• Poor contact of
coupling connector
Go to step 4.
Repair the ground
short circuit of har-
ness between
ECM and drain
valve connector.
Go to step 5. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and drain
valve connector
• Poor contact of
coupling connector
Go to step 6. Replace the drain
valve. <Ref. to
EC(H4SO)-15,
Drain Valve.>