Subaru 2009 IMPREZA Service Manual page 1414

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK SECONDARY AIR PUMP FUSE.
Check if the secondary air pump fuse (60 A) is
blown out.
2 CHECK HARNESS BETWEEN FUSE BOX
AND SECONDARY AIR PUMP CONNECTOR.
1) Remove the secondary air pump fuse from
the fuse box.
2) Disconnect the secondary air pump con-
nector.
3) Measure the resistance between the sec-
ondary air pump fuse and secondary air pump
connector, and chassis ground.
Connector & terminal
(F9) No. 16 — Chassis ground:
(F11) No. 2 — Chassis ground:
3 CHECK SECONDARY AIR PUMP OPERA-
TION.
1) Connect the delivery (test) mode connector.
2) Turn the ignition switch to ON.
3) Perform the Clear Memory Mode.
4) Perform operation check for the secondary
air pump using the Subaru Select Monitor.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"Clear Memory
EN(H4DOTC)(diag)-54, Clear Memory Mode.>
and "Compulsory Valve Operation Check
Mode"<Ref. to EN(H4DOTC)(diag)-55, Com-
pulsory Valve Operation Check Mode.>.
• The compulsory operation using the Subaru
Select Monitor is performed only for 5 seconds
in order to protect the secondary air pump.
When operating again, perform the Clear Mem-
ory Mode.
4 CHECK DUCT BETWEEN SECONDARY AIR
PUMP AND COMBINATION VALVE.
Check the duct between secondary air pump
and combination valve.
5 CHECK POWER SUPPLY TO SECONDARY
AIR PUMP.
1) Perform the Clear Memory Mode.
2) Turn the ignition switch to OFF.
3) Disconnect the secondary air pump con-
nector.
4) In the condition of step 3, measure the volt-
age between the secondary air pump connector
and the chassis ground.
NOTE:
For detailed procedures, refer to "Clear Memory
Mode". <Ref. to EN(H4DOTC)(diag)-54, Clear
Memory Mode.>
Connector & terminal
(F11) No. 2 (+) — Chassis ground (–):
Is the fuse blown out?
Is the resistance 1 M or
more?
Does the secondary air pump
operate?
Mode"<Ref. to
Is there damage, clog or dis-
connection of the duct?
Is the voltage 10 V or more?
EN(H4DOTC)(diag)-193
Check Yes
Go to step 2.
Replace the fuse
with a new part,
and connect the
secondary air
pump connector.
Go to step 3.
Go to step 4.
Replace, clean or
connect the duct.
Replace the sec-
ondary air pump.
<Ref. to
EC(H4DOTC)-24,
Secondary Air
Pump.>
ENGINE (DIAGNOSTICS)
No
Go to step 3.
Repair ground
short of the har-
ness between the
fuse box and the
secondary air
pump connector.
Go to step 5.
Replace the sec-
ondary air combi-
nation valve RH.
<Ref. to
EC(H4DOTC)-25,
Secondary Air
Combination
Valve.>
Go to step 6.