Subaru IMPREZA GD 2007 Series Manual page 1511

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
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.
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
(F129) No. 13 — Chassis ground:
(F127) No. 2 — Chassis ground:
3 CHECK SECONDARY AIR PUMP OPERA-
TION.
1) Connect the 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
Refer to "Clear Memory Mode" <Ref. to
EN(STI)(diag)-48, Clear Memory Mode.> and
"Compulsory Valve Operation Check Mode"
<Ref. to EN(STI)(diag)-49, Compulsory Valve
Operation Check Mode.> for more operation
procedures.
• 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.
Inspection of the duct between the 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(STI)(diag)-48, Clear Mem-
ory Mode.>
Connector & terminal
(F127) No. 2 (+) — Chassis ground (–):
Check
Is the fuse blown out?
Is the resistance 1 MΩ or more? Replace the fuse
Does the secondary air pump
operate?
Is there damage, clog or dis-
connection of the duct?
Is the voltage 10 V or more?
EN(STI)(diag)-180
Yes No
Go to step 2. Go to step 3.
Repair ground
with a new part, short of the har-
and connect the ness between the
secondary air fuse box and the
pump connector. secondary air
Go to step 3.
pump.
Go to step 4. Go to step 5.
Replace, clean or Replace the sec-
connect the duct. ondary air combi-
nation valve LH.
<Ref. to
EC(H4DOTC)-10,
Secondary Air
Combination
Valve.>
Replace the sec- Go to step 6.
ondary air pump.
<Ref. to
EC(H4DOTC)-9,
Secondary Air
Pump.>