Subaru IMPREZA GD 2007 Series Manual page 1688

asieps_tobira_IM_US.book 357 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK CURRENT DATA.
1) Turn the ignition switch to ON.
2) Read the data of secondary air pipe pres-
sure signal using the Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
2 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the second-
ary air combination valve LH.
3) Turn the ignition switch to ON.
4) Read the data of secondary air pipe pres-
sure signal using the Subaru Select Monitor or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(STI)(diag)-33, Subaru Select Monitor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
3 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance of the harness
between the secondary air combination valve
LH connector and engine ground.
Connector & terminal
(E116) No. 4 — Engine ground:
4 CHECK POOR CONTACT.
Check for poor contact of the secondary air
combination valve LH connector.
Check
Is the measured value 133.3
kPa (1000 mmHg, 39.4 inHg) or
more?
Is the measured value 133.3
kPa (1000 mmHg, 39.4 inHg) or
more?
Is the resistance less than 5 Ω? Go to step 4.
Is there poor contact of the sec-
ondary air combination valve
LH connector?
EN(STI)(diag)-357
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Even if the malfunc-
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.
Repair the short Go to step 3.
circuit to power in
the harness
between ECM and
secondary air com-
bination valve LH
connectors.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and second-
ary air combination
valve LH connec-
tor
• Poor contact in
ECM connector
• Poor contact of
coupling connector
Repair the poor Replace the sec-
contact of the sec- ondary air combi-
ondary air combi- nation valve LH.
nation valve LH <Ref. to
connector. EC(H4DOTC)-10,
Secondary Air
Combination
Valve.>