Subaru Legacy 2003 Service Manual page 588

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
2 CHECK CURRENT DATA.
1) Start engine.
2) Rear the data of intake manifold absolute
pressure signal using Subaru Select Moni-
tor or OBD-II general scan tool.
Does the measured value exceed the spec-
ified value?
NOTE:
•Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE".
<Ref. to EN(H6DO)-34, Subaru Select Moni-
tor.>
•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:
Does the measured value exceed the
specified value?
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:
Is the measured value within the specified
range?
Value
Other DTC indicated on dis-
play.
53.3 kPa (400 mmHg, 15.75
inHg)
10 V
20 — 30 Ω
EN(H4SO)-191
ENGINE (DIAGNOSTICS)
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
Check if EGR Go to step 3.
valve, intake mani-
fold pressure sen-
sor and throttle
body are securely
installed.
Go to step 4. Repair open circuit
in harness
between main
relay and EGR
solenoid valve
connector.
Go to step 5. Replace EGR
solenoid valve.
<Ref. to
FU(H4SO)-35,
EGR Valve.>
No