Subaru Legacy III (2000-2003 year). Manual — part 125

EN(H4SO)-112

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

6

CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from pressure sen-

sor.

3) Turn ignition switch to ON.
4) Measure voltage between pressure sensor

connector and engine ground.

Connector & terminal

(E21) No. 3 (+) — Engine ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

4.5 V

Go to step 7.

Repair open circuit
in harness
between ECM and
pressure sensor
connector.

7

CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Measure resistance of harness between

ECM and pressure sensor connector.

Connector & terminal

(B135) No. 15 — (E21) No. 2:
(B135) No. 1 — (E21) No. 1:

Is the measured value less than the speci-
fied value?

1

Ω

Go to step 8.

Repair open circuit
in harness
between ECM and
pressure sensor
connector.

8

CHECK POOR CONTACT.
Check poor contact in pressure sensor con-
nector.
Is there poor contact in pressure sensor con-
nector?

There is poor contact.

Repair poor con-
tact in pressure
sensor connector.

Replace pressure
sensor. <Ref. to
FU(H4SO)-32,
Pressure Sensor.>

9

CHECK HARNESS BETWEEN ECM AND
PRESSURE SENSOR CONNECTOR.
1) Turn ignition switch to OFF and Subaru

Select Monitor or the OBD-II general scan
tool switch to OFF.

2) Disconnect connector from pressure sen-

sor.

3) Turn ignition switch to ON and Subaru

Select Monitor or the OBD-II general scan
tool switch to ON.

4) Read data of intake manifold absolute pres-

sure signal using Subaru Select Monitor 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(H4SO)-32, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.

119.5 kPa (896.5 mmHg,
35.29 inHg)

Repair battery
short circuit in har-
ness between
ECM and pressure
sensor connector.

Replace pressure
sensor. <Ref. to
FU(H4SO)-32,
Pressure Sensor.>

Step

Value

Yes

No

EN(H4SO)-113

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H4SO)-114

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

I:

DTC P0111 — INTAKE AIR TEMPERATURE CIRCUIT RANGE/PERFOR-
MANCE —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

• TROUBLE SYMPTOM:

• Erroneous idling
• Poor driving performance

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
• WIRING DIAGRAM:

EN-01124

D6

B19

INTAKE AIR

TEMPERATURE

SENSOR

B135

14

9

B21

E2

1

2

E20

B21

ECM

B:

B137

D:

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

E20

1 2

B137

4

1
5

3

2
6

18

15

16

7 8 9 10 11

17

19 20

12 13

14

5 6 7

8

2

1

9

4

3

10

24

22 23

25

11 12 13 14 15

26

27 28

16 17 18 19

20 21

B135

B83

3

1

FG

2

4

EG

: FOR G.C.C COUNTRIES MODEL

: EXCEPT FOR G.C.C COUNTRIES MODEL

FG

EG

B83

1 2 3 4 5 6

EN(H4SO)-115

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?

DTC indicated.

Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>

NOTE:
In this case, it is
not necessary to
inspect DTC
P0111.

Go to step 2.

2

CHECK ENGINE COOLANT TEMPERA-
TURE.
1) Start the engine and warm it up completely.
2) Measure engine coolant temperature using

Subaru Select Monitor or OBD-II general
scan tool.
Is the measured value within the specified
range?

NOTE:

•Subaru Select Monitor
For detailed operation procedure, refer to the
“READ CURRENT DATA FOR ENGINE”.
<Ref. to EN(H4SO)-32, Subaru Select Moni-
tor.>
•OBD-II general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.

75 - 95

°

C (167 - 203

°

F) Replace

intake

air

temperature sen-
sor. <Ref. to
FU(H4SO)-33,
REMOVAL, Intake
Air Temperature
Sensor.>

Inspect DTC
P0125 using “List
of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>