Subaru Legacy 2005 Service Manual page 1897

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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 or
general scan tool.
NOTE:
• Subaru Select Monitor
For detailed operation procedure, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H6DO)(diag)-26, Subaru Select Moni-
tor.>
• General scan tool
For detailed operation procedure, refer to the
general scan tool operation manual.
3 CHECK POWER SUPPLY OF EGR SOLE-
NOID 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.
Terminal
No. 1 — No. 2:
No. 3 — No. 2:
No. 4 — No. 5:
No. 6 — No. 5:
5 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 53.3 kPa (400
mmHg, 15.75 inHg) or more?
Is the voltage more than 10 V? Go to step 4.
Is the resistance 20 — 30 Ω?
Is the voltage 0 — 10 V?
−
):
−
):
−
):
−
):
EN(H6DO)(diag)-201
ENGINE (DIAGNOSTICS)
Yes
Check DTC using Go to step 2.
the List of Diag-
nostic Trouble
Code (DTC). <Ref.
to
EN(H6DO)(diag)-
66, List of Diag-
nostic Trouble
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 of harness
between main
relay and EGR
solenoid valve
connector.
Go to step 5. Replace the EGR
solenoid valve.
<Ref. to
FU(H6DO)-25,
EGR Valve.>
Repair the poor Go to step 6.
contact in ECM
connector.
No