Subaru 2009 IMPREZA Service Manual page 1577

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 RH CONNECTOR.
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 RH.
3) Measure the resistance between the sec-
ondary air combination valve fuse and second-
ary air combination valve RH connector, and
chassis ground.
Connector & terminal
(F9) No. 5 — Chassis ground:
(E41) No. 6 — Chassis ground:
3 CHECK SECONDARY AIR COMBINATION
VALVE RH OPERATION.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Perform operation check for the secondary
air combination valve RH using the Subaru
Select Monitor.
NOTE:
Refer to "Compulsory Valve Operation Check
Mode" for more operation procedures. <Ref. to
EN(H4DOTC)(diag)-55, Compulsory Valve Op-
eration Check Mode.>
4 CHECK DUCT BETWEEN SECONDARY AIR
PUMP AND SECONDARY AIR COMBINA-
TION VALVE RH.
Check the duct between the secondary air
pump and secondary air combination valve RH.
5 CHECK PIPE BETWEEN SECONDARY AIR
COMBINATION VALVE RH AND CYLINDER
HEAD.
Check the pipe between the secondary air com-
bination valve RH and cylinder head.
6 CHECK POWER SUPPLY TO SECONDARY
AIR COMBINATION VALVE RH.
1) Disconnect the connector from the second-
ary air combination valve RH.
2) In the condition of step 3, measure the volt-
age between secondary air combination valve
RH connector and chassis ground.
Connector & terminal
(E41) No. 6 (+) — Chassis ground (–):
Check
Is the fuse blown out?
Is the resistance 1 M or
more?
Does the secondary air combi-
nation valve RH 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(H4DOTC)(diag)-356
Yes No
Go to step 2. Go to step 3.
Replace the fuse Repair the short
with a new part, circuit to ground in
and connect the harness between
secondary air com- the fuse box and
bination valve RH the secondary air
connector. combination valve
Go to step 3. RH connector.
Go to step 4. Go to step 6.
Replace, clean or Go to step 5.
connect the duct.
Replace, clean or Even if DTC is
connect the pipe. detected, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the failure,
and then perform
the diagnosis
again.
NOTE:
In this case, tem-
porary poor con-
tact of connector
may be the cause.
Replace the sec- Go to step 7.
ondary air combi-
nation valve RH.
<Ref. to
EC(H4DOTC)-25,
Secondary Air
Combination
Valve.>