Subaru IMPREZA GD 2007 Series Manual page 1691

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK SECONDARY AIR COMBINATION
VALVE FUSE.
Check if the secondary air combination valve
fuse (10 A) is blown out.
2 CHECK HARNESS BETWEEN FUSE BOX
AND SECONDARY AIR COMBINATION
VALVE.
1) Remove the secondary air combination
valve fuse (10 A) from the fuse box.
2) Disconnect the connector from the second-
ary air combination valve LH.
3) Measure the resistance between the sec-
ondary air combination valve fuse and second-
ary air combination valve connector, and
chassis ground.
Connector & terminal
(F129) No. 2 — Chassis ground:
(E116) No. 2 — Chassis ground:
3 CHECK SECONDARY AIR COMBINATION
VALVE OPERATION.
1) Connect the test mode connector.
2) Turn the ignition switch to ON.
3) Perform operation check for the secondary
air combination valve using the Subaru Select
Monitor.
NOTE:
Refer to "Compulsory Valve Operation Check
Mode" for more operation procedures. <Ref. to
EN(STI)(diag)-49, Compulsory Valve Opera-
tion Check Mode.>
4 CHECK DUCT BETWEEN SECONDARY AIR
PUMP AND SECONDARY AIR COMBINA-
TION VALVE.
Check the duct between the secondary air
pump and secondary air combination valve.
5 CHECK PIPE BETWEEN SECONDARY AIR
COMBINATION VALVE AND CYLINDER
HEAD.
Inspection of the pipe between the secondary
air combination valve and cylinder head.
6 CHECK POWER SUPPLY TO SECONDARY
AIR COMBINATION VALVE.
1) Disconnect the connector from the second-
ary air combination valve LH.
2) In the condition of step 3, measure the volt-
age between the secondary air combination
valve connector and the chassis ground.
Connector & terminal
(E116) No. 2 (+) — Chassis ground (–):
Check
Is the fuse blown out?
Is the resistance 1 MΩ or more? Replace the fuse
Does the secondary air combi-
nation valve repeatedly switch
to ON and OFF?
Is there damage, clog or dis-
connection of the duct?
Is there damage, clog or dis-
connection of the pipe?
Does the voltage repeatedly
change between 10 V and 0 V?
EN(STI)(diag)-360
Yes No
Go to step 2. Go to step 3.
Repair the ground
with a new part, short circuit of har-
and connect the ness between the
secondary air com- fuse box and the
bination valve con- secondary air com-
nector. bination valve LH.
Go to step 3.
Go to step 4. Go to step 6.
Replace, clean or Go to step 5.
connect the duct.
Replace, clean or Even if the malfunc-
connect the pipe. tion indicator light
illuminates, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.
Replace the sec- Go to step 7.
ondary air combi-
nation valve. <Ref.
to EC(H4DOTC)-
10, Secondary Air
Combination
Valve.>