Subaru IMPREZA GD 2007 Series Manual page 1685

asieps_tobira_IM_US.book 354 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)
ENGINE (DIAGNOSTICS)
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 SECONDARY AIR COMBINATION
VALVE LH POWER SUPPLY.
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) Measure the voltage between the second-
ary air combination valve LH connector and
chassis ground.
Connector & terminal
(E116) No. 1 (+) — Chassis ground (–):
3 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
LH CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance of the harness
between the ECM and secondary air combina-
tion valve LH connector.
Connector & terminal
(B134) No. 27 — (E116) No. 6:
4 CHECK HARNESS BETWEEN ECM AND
SECONDARY AIR COMBINATION VALVE
LH CONNECTOR.
Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B134) No. 27 — Chassis ground:
5 CHECK POOR CONTACT.
Check for poor contact in the ECM and second-
ary air combination valve LH connector.
Check
Is the measured value less than
53.3 kPa (400 mmHg, 15.8
inHg) ?
Is the voltage 4.5 V or more?
Is the resistance less than 1 Ω? Go to step 4.
Is the resistance 1 MΩ or more? Go to step 5.
Is there poor contact in the
ECM or secondary air combi-
nation valve LH connector?
EN(STI)(diag)-354
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.
Go to step 3. 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 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 of
coupling connector
Repair the ground
short circuit of har-
ness between
ECM and second-
ary air combination
valve LH connec-
tor.
Repair the poor Replace the sec-
contact in the ECM ondary air combina-
or secondary air tion valve LH. <Ref.
combination valve to EC(H4DOTC)-
LH connector. 10, Secondary Air
Combination
Valve.>