Subaru 2009 IMPREZA Service Manual page 1583

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
7 CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE LH AND CHAS-
SIS GROUND.
Measure the resistance between the secondary
air combination valve LH connector and chassis
ground.
Connector & terminal
(E40) No. 1 — Chassis ground:
8 CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RELAY 2 AND
SECONDARY AIR COMBINATION VALVE
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air combination
valve relay 2 from the relay box.
3) Measure the resistance of the harness
between the secondary air combination valve
relay 2 and secondary air combination valve LH
connector.
Connector & terminal
(F9) No. 8 — (E40) No. 2:
9 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 2.
1) Connect the battery to terminals No. 2 and
No. 2 of the secondary air combination valve
relay 10.
2) Measure the resistance between the sec-
ondary air combination valve relay 2 terminals.
Terminals
No. 7 — No. 8:
10 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 2.
Measure the resistance between the secondary
air combination valve relay 2 terminals with the
battery disconnected.
Terminals
No. 7 — No. 8:
11 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 2 POWER SUPPLY.
1) Turn the ignition switch to ON.
2) Measure the voltage between the second-
ary air combination valve relay 2 connector and
chassis ground.
Connector & terminal
(F9) No. 7 (+) — Chassis ground (–):
(F9) No. 10 (+) — Chassis ground (–):
12 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 2 CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector of ECM.
3) Measure the resistance of harness between
ECM and secondary air combination valve relay
2 connector.
Connector & terminal
(B135) No. 14 — (F9) No. 9:
Check
Is the resistance less than 5 ? Go to step 8.
Is the resistance less than 1 ? Go to step 9.
Is the resistance less than 1 ? Go to step 10.
Is the resistance 1 M or
more?
Is the voltage 10 V or more?
Is the resistance less than 1 ? Go to step 13.
EN(H4DOTC)(diag)-362
Yes No
Repair the open
circuit in harness
between second-
ary air combination
valve LH connector
and chassis
ground.
Repair the open
circuit in harness
between second-
ary air combination
valve relay 2 con-
nector and sec-
ondary air
combination valve
LH connector.
Replace the sec-
ondary air combina-
tion valve relay 2.
<Ref. to
EN(H4DOTC)(diag)
-8, Electrical Com-
ponent Location.>
Go to step 11. Replace the sec-
ondary air combina-
tion valve relay 2.
<Ref. to
EN(H4DOTC)(diag)
-8, Electrical Com-
ponent Location.>
Go to step 12. Repair the open or
ground short circuit
of power supply
circuit.
Repair the open
circuit of harness
between ECM and
secondary air com-
bination valve relay
2 connector.