Subaru Legacy III (2000-2003 year). Service manual — part 356
EN(H6DO)-226
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AX:DTC P0400 — EXHAUST GAS RECIRCULATION FLOW —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Poor driving performance on low engine speed
• Erroneous idling
• Poor driving performance.
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
• WIRING DIAGRAM:
EN-01090
F46
B47
4
3
1
6
2
4
6
12
26
25
14
13
B20
E1
B108
F46
E1
B20
E18
5
2
1
5
B137 ECM
EGR
SOLENOID
VALVE
BATTERY
SBF-5
B47
MAIN RELAY
1
2
3
5
4
6
B20
E18
1
3
4 5 6
2
3 4
1 2
3
4
1
2
5
6
B137
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
LHD
RHD
LHD
RHD
EN(H6DO)-227
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
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
<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.
53.3 kPa (400 mmHg, 15.75
inHg)
Check if EGR
valve, intake mani-
fold pressure sen-
sor and throttle
body are securely
installed.
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 spec-
ified value?
10 V
Repair open circuit
in harness
between main
relay and EGR
solenoid valve
connector.
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?
20 — 30
Ω
Replace EGR
solenoid valve.
<Ref. to
EC(H6DO)-10,
EGR Valve.>
EN(H6DO)-228
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK OUTPUT SIGNAL FROM ECM.
1) Turn ignition switch to OFF.
2) Connect connectors to ECM and EGR sole-
noid 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:
Does the measured value fluctuate within
the specified range?
0 — 10 V
Repair poor con-
tact in ECM con-
nector.
6
CHECK HARNESS BETWEEN EGR SOLE-
NOID VALVE AND ECM CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connectors from EGR solenoid
valve and ECM.
3) Measure resistance of harness between
EGR solenoid valve and ECM connector.
Connector & terminal
(B137) No. 25 — (E18) No. 6:
(B137) No. 26 — (E18) No. 1:
(B137) No. 13 — (E18) No. 4:
(B137) No. 14 — (E18) No. 3:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between ECM and
EGR solenoid
valve connector.
7
CHECK HARNESS BETWEEN EGR SOLE-
NOID VALVE AND ECM CONNECTOR.
Measure resistance of harness between EGR
solenoid valve and chassis ground.
Connector & terminal
(B137) No. 25 — Chassis ground:
(B137) No. 26 — Chassis ground:
(B137) No. 13 — Chassis ground:
(B137) No. 14 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair short circuit
in harness
between main
relay and EGR
solenoid valve
connector.
8
CHECK POOR CONTACT.
Check poor contact in ECM and EGR solenoid
valve connector.
Is there poor contact in ECM and EGR sole-
noid valve connector?
There is poor contact.
Repair poor con-
tact in ECM and
EGR solenoid
valve connector.
Even if MI lights
up, the circuit has
returned to a nor-
mal condition at
this time.
Step
Value
Yes
No
EN(H6DO)-229
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
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