Subaru Legacy 2002 Service Manual page 1428

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK CURRENT DATA.
1) Start engine.
2) Rear the data of intake manifold absolute
pressure signal using Subaru Select Monitor
or OBD-II general scan tool.
NOTE:
¼ Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. EN(H6)-38, Subaru Select Monitor.>
¼ OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
3 CHECK POWER SUPPLY TO EGR SOLE-
NOID VALVE.
1) Disconnect connector from EGR solenoid
valve.
2) Turn ignition switch to ON.
3) Measure voltage between EGR solenoid
valve and engine ground.
Connector & terminal
(E18) No. 2 — Engine ground:
(E18) No. 5 — Engine ground:
4 CHECK EGR SOLENOID VALVE.
Measure resistance between EGR solenoid
valve terminals.
NOTE:
Make sure there are no foreign objects caught
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 ignition switch to OFF.
2) Connect connectors to ECM and EGR
solenoid valve.
3) Turn ignition switch to ON.
4) Measure voltage between ECM and chas-
sis ground.
Connector & terminal
(B137) No. 25 — Chassis ground:
(B137) No. 26 — Chassis ground:
(B137) No. 13 — Chassis ground:
(B137) No. 14 — Chassis ground:
Step
Is there any other DTC on
display?
Is the value more than 53.3
kPa (400 mmHg, 15.75
inHg)?
Is the voltage more than 10
V?
Is the resistance between
20 and 30 Ω?
Does voltage change
between 0 and 10 V?
EN(H6)-221
Check Yes
Inspect the rel-
evant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H6)-87, List of
Diagnostic
Trouble Code
(DTC).>
Check if EGR
valve, intake
manifold pressure
sensor and
throttle body are
securely installed.
Go to step 4.
Go to step 5.
Repair poor con-
tact in ECM con-
nector.
Engine (DIAGNOSTICS)
No
Go to step 2.
Go to step 3.
Repair open cir-
cuit in harness
between main
relay and EGR
solenoid valve
connector.
Replace EGR
solenoid valve.
<Ref. to EC(H6)-
10, EGR Valve.>
Go to step 6.