Subaru LEGACY 2006 Manual page 244

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Connect the test mode connector at the
lower portion of instrument panel (on the
driver's side).
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground while operating the drain valve.
NOTE:
Drain valve operation can be executed using
Subaru Select Monitor. For procedure, refer to
"Compulsory Valve Operation Check Mode".
<Ref. to EN(H4SO)(diag)-44, Compulsory
Valve Operation Check Mode.>
Connector & terminal
(B136) No. 17 (+) — Chassis ground (–):
2 CHECK INPUT 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 (–):
3 CHECK POOR CONTACT.
Check poor contact of ECM connector.
4 CHECK HARNESS BETWEEN DRAIN
VALVE AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the drain
valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 17 (+) — Chassis ground (–):
5 CHECK DRAIN VALVE.
1) Turn the ignition switch to OFF.
2) Measure the resistance between drain
valve terminals.
Terminals
No. 1 — No. 2:
6 CHECK POOR CONTACT.
Check poor contact of ECM connector.
Check
Is the voltage 0 — 10 V?
Is the voltage more than 10 V? Go to step 4.
Is there poor contact in ECM
connector?
Is the voltage more than 10 V? Repair the battery
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(H4SO)(diag)-207
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Even if the mal-
function indicator
light illuminates,
the circuit has
returned to a nor-
mal condition at
this time. In this
case, repair the
poor contact in
ECM connector.
Go to step 3.
Repair the poor Replace the ECM.
contact of ECM <Ref. to
connector. FU(H4SO)-36,
Engine Control
Module (ECM).>
Go to step 5.
short circuit of har-
ness between
ECM and drain
valve connector.
After repair,
replace the ECM.
<Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>
Replace the drain Go to step 6.
valve <Ref. to
EC(H4SO)-15,
Drain Valve.> and
ECM <Ref. to
FU(H4SO)-36,
Engine Control
Module (ECM).>.
Repair the poor Replace the ECM.
contact of ECM <Ref. to
connector. FU(H4SO)-36,
Engine Control
Module (ECM).>