Subaru Legacy 2004 Service Manual page 984

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK GROUND CIRCUIT FOR ECM.
1) Turn the ignition switch to OFF.
2) Measure the resistance between ECM con-
nector and chassis ground.
Connector & terminal
(B135) No. 1 — Chassis ground:
(B135) No. 4 — Chassis ground:
(B137) No. 1 — Chassis ground:
(B137) No. 2 — Chassis ground:
3 CHECK HARNESS BETWEEN ECM AND
EGR SOLENOID VALVE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from EGR sole-
noid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM con-
nector and chassis ground.
Connector & terminal
DTC P1493; (B134) No. 11 (+) — Chassis
"
ground ( ):
DTC P1495; (B134) No. 10 (+) — Chassis
"
ground ( ):
DTC P1497; (B134) No. 9 (+) — Chassis
"
ground ( ):
DTC P1499; (B134) No. 8 (+) — Chassis
"
ground ( ):
Check
Is any other DTC displayed?
Is the resistance less than 5
!?
Is the voltage more than 10 V? Repair battery
EN(H4SO 2.5)(diag)-225
ENGINE (DIAGNOSTICS)
Yes
Inspect the DTC Go to step 2.
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to EN(H4SO
2.5)(diag)-70, List
of Diagnostic Trou-
ble Code (DTC).>
Go to step 3. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM connector
and engine ground
terminal
• Poor contact in
ECM connector
• Poor contact in
coupling connector
Replace the ECM.
short in harness <Ref. to FU(H4SO
between ECM and 2.5)-36, Engine
EGR solenoid Control Module
valve connector. (ECM).>
After repairing,
replace the ECM.
<Ref. to FU(H4SO
2.5)-36, Engine
Control Module
(ECM).>
No