Subaru IMPREZA GD 2007 Series Manual page 368

asieps_tobira_IM_US.book 259 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK BLOW-BY HOSE.
Check the blow-by hose condition.
2 CHECK HARNESS BETWEEN ECM AND
PCV HOSE ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM
and PCV hose assembly.
3) Measure the resistance of harness between
ECM and PCV hose assembly.
Connector & terminal
(B134) No. 30 — (E117) No. 2:
3 CHECK HARNESS BETWEEN ECM AND
PCV HOSE ASSEMBLY.
Measure the resistance between PCV hose
assembly and chassis ground.
Connector & terminal
(B134) No. 30 — Chassis ground:
4 CHECK GROUND CIRCUIT OF PCV HOSE
ASSEMBLY.
Measure the resistance of harness between
PCV hose assembly and engine ground.
Connector & terminal
(E117) No. 1 — Engine ground:
5 CHECK THE PCV HOSE ASSEMBLY.
Measure the resistance between the PCV hose
assembly terminals.
Terminals
No. 1 — No. 2:
Check
Is there any disconnection or
crack in blow-by hose?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance 1 MΩ or
more?
Is the resistance less than 5 Ω? Go to step 5.
Is the resistance less than 1 Ω? Repair the poor
EN(H4SO)(diag)-259
ENGINE (DIAGNOSTICS)
Yes No
Repair or replace Go to step 2.
the blow-by hose.
Repair the open
circuit of harness
between ECM and
PCV hose assem-
bly.
Go to step 4. Repair short cir-
cuit of the harness
to ground between
ECM and PCV
hose assembly.
Repair the open
circuit of harness
between PCV hose
assembly and
engine ground.
Replace the PCV
contact in ECM hose assembly.
and PCV hose
assembly connec-
tor.