Subaru 2009 IMPREZA Service Manual page 1578

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RH AND CHAS-
SIS GROUND.
Measure the resistance between the secondary
air combination valve RH connector and chas-
sis ground.
Connector & terminal
(E41) No. 4 — Chassis ground:
8 CHECK HARNESS BETWEEN SECONDARY
AIR COMBINATION VALVE RELAY 1 AND
SECONDARY AIR COMBINATION VALVE
RH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Remove the secondary air combination
valve relay 1 from the relay box.
3) Measure the resistance of the harness
between secondary air combination valve relay
1 connector and secondary air combination
valve RH connector.
Connector & terminal
(F9) No. 3 — (E41) No. 6:
9 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1.
1) Connect the battery to terminals No. 1 and
No. 2 of the secondary air combination valve
relay 1.
2) Measure the resistance between the sec-
ondary air combination valve relay 1 terminals.
Terminals
No. 3 — No. 4:
10 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1.
Measure the resistance between the secondary
air combination valve relay 1 terminals with the
battery disconnected.
Terminals
No. 3 — No. 4:
11 CHECK SECONDARY AIR COMBINATION
VALVE RELAY 1 POWER SUPPLY.
1) Turn the ignition switch to ON.
2) Measure the voltage between the second-
ary air combination valve relay 1 connector and
chassis ground.
Connector & terminal
(F9) No. 4 (+) — Chassis ground (–):
(F9) No. 1 (+) — Chassis ground (–):
12 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
RELAY 1 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
1 connector.
Connector & terminal
(B135) No. 15 — (F9) No. 2:
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)-357
ENGINE (DIAGNOSTICS)
Yes No
Repair the open
circuit in harness
between second-
ary air combination
valve RH connec-
tor and chassis
ground.
Repair the open
circuit in harness
between second-
ary air combination
valve relay 1 and
secondary air com-
bination valve RH
connector.
Replace the sec-
ondary air combina-
tion valve relay 1.
<Ref. to
EN(H4DOTC)(diag)
-8, Electrical Com-
ponent Location.>
Go to step 11. Replace the sec-
ondary air combina-
tion valve relay 1.
<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
1 connector.