Subaru Legacy 2004 Service Manual page 921

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK CURRENT DATA.
1) Start the engine.
2) Read the data of intake manifold absolute
pressure signal using Subaru Select Monitor.
NOTE:
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO 2.5)(diag)-26, Subaru Select Mon-
itor.>
3 CHECK THE POWER SUPPLY OF EGR SO-
LENOID VALVE.
1) Detach the connector from EGR solenoid
valve.
2) Turn the ignition switch to ON.
3) Measure the voltage between EGR sole-
noid valve and engine ground.
Connector & terminal
(E18) No. 2 (+) — Engine ground (
(E18) No. 5 (+) — Engine ground (
4 CHECK EGR SOLENOID VALVE.
Measure the resistance between EGR sole-
noid valve terminals.
NOTE:
Make sure there is no foreign material between
EGR solenoid valve and valve seat.
Terminals
No. 1 — No. 2:
No. 3 — No. 2:
No. 4 — No. 5:
No. 6 — No. 5:
5 CHECK OUTPUT SIGNAL FROM ECM.
1) Turn the ignition switch to OFF.
2) Connect the connector to ECM and EGR
solenoid valve.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B134) No. 8 (+) — Chassis ground (
(B134) No. 9 (+) — Chassis ground (
(B134) No. 10 (+) — Chassis ground (
(B134) No. 11 (+) — Chassis ground (
Check
Is any other DTC displayed?
Is the value more than 53.3
kPa (400 mmHg, 15.75 inHg)?
Is the voltage more than 10 V? Go to step 4.
"
):
"
):
Is the resistance 20 — 30 !?
Is the voltage 0 — 10 V?
"
):
"
):
"
):
"
):
EN(H4SO 2.5)(diag)-162
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).>
Make sure that the Go to step 3.
EGR valve, mani-
fold absolute pres-
sure sensor and
throttle body are
installed securely.
Repair the open
circuit in harness
between main
relay and EGR
solenoid valve
connector.
Go to step 5. Replace the EGR
solenoid valve.
<Ref. to FU(H4SO
2.5)-30, EGR
Valve.>
Repair the poor Go to step 6.
contact portion in
ECM connector.
No