Subaru LEGACY 2006 Manual page 302

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK POWER SUPPLY TO EGR VALVE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from EGR valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between EGR valve
connector and engine ground.
Connector & terminal
(E18) No. 2 (+) — Engine ground (–):
(E18) No. 5 (+) — Engine ground (–):
2 CHECK HARNESS BETWEEN ECM AND
EGR VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM and
EGR valve connector.
Connector & terminal
DTC P1492; (B134) No. 8 — (E18) No. 3:
DTC P1494; (B134) No. 9 — (E18) No. 1:
DTC P1496; (B134) No. 10 — (E18) No. 4:
DTC P1498; (B134) No. 20 — (E18) No. 6:
3 CHECK HARNESS BETWEEN ECM AND
EGR VALVE CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
DTC P1492; (B134) No. 8 — Chassis
ground:
DTC P1494; (B134) No. 9 — Chassis
ground:
DTC P1496; (B134) No. 10 — Chassis
ground:
DTC P1498; (B134) No. 20 — Chassis
ground:
4 CHECK POOR CONTACT.
Check poor contact in ECM connector and
EGR valve connector.
Check
Is the voltage more than 10 V? Go to step 2.
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is there poor contact in ECM
connector or EGR valve con-
nector?
EN(H4SO)(diag)-265
ENGINE (DIAGNOSTICS)
Yes No
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
EGR valve
main relay connec-
tor
• Poor contact of
coupling connector
Go to step 3. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and
valve connector
• Poor contact of
coupling connector
Go to step 4. Repair the ground
short in harness
between ECM and
EGR valve con-
nector.
Repair the poor Replace the EGR
contact in ECM valve. <Ref. to
connector or EGR FU(H4SO)-26,
alve connector. EGR Valve.>
and
EGR