Subaru LEGACY 2006 Manual page 298

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK BLOW-BY HOSE.
Check the condition of the blow-by hose.
2 CHECK HARNESS BETWEEN PCV DIAGNO-
SIS CONNECTOR AND ECM CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the PCV
diagnosis connector and ECM.
3) Measure the resistance of harness
between PCV diagnosis connector and ECM
connector.
Connector & terminal
(B134) No. 30 — (E61) No. 2:
3 CHECK HARNESS BETWEEN PCV DIAGNO-
SIS CONNECTOR AND ECM CONNECTOR.
Measure the resistance of harness between
PCV diagnosis connector and chassis ground.
Connector & terminal
(B134) No. 30 — Chassis ground:
4 CHECK GROUND CIRCUIT OF PCV DIAG-
NOSIS CONNECTOR.
Measure the resistance of harness between
PCV diagnosis connector and engine ground.
Connector & terminal
(E61) No. 1 — Engine ground:
5 CHECK PCV DIAGNOSIS CONNECTOR.
Measure the resistance between PCV diagno-
sis connector terminals.
Terminals
No. 1 — No. 2:
Check
Is there any disconnection or
crack in blow-by hose?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance less than 5
Ω?
Is the resistance less than 1
Ω?
EN(H4SO)(diag)-261
ENGINE (DIAGNOSTICS)
Yes No
Replace or repair Go to step 2.
the blow-by hose.
Go to step 3. Repair the open
circuit of harness
between PCV
diagnosis connec-
tor and ECM con-
nector.
Go to step 4.
Repair the ground
short circuit of har-
ness between
PCV diagnosis
connector and
ECM connector.
Go to step 5.
Repair the ground
circuit of PCV
diagnosis connec-
tor.
Repair the poor Replace the PCV
contact in ECM diagnosis connec-
connector and tor.
PCV diagnosis
connector.