Subaru Legacy III (2000-2003 year). Service manual — part 362

EN(H6DO)-250

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).>

Check radiator fan
and fan motor.
<Ref. to
CO(H6DO)-7,
INSPECTION,
Radiator Main Fan
System.> and
<Ref. to
CO(H6DO)-15,
INSPECTION,
Radiator Sub Fan
System.>

EN(H6DO)-251

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BF:DTC P0502 — VEHICLE SPEED SENSOR CIRCUIT LOW INPUT —

NOTE:
For the diagnostic procedure, refer to DTC P0503. <Ref. to EN(H6DO)-252, DTC P0503 — VEHICLE
SPEED SENSOR INTERMITTENT/ERRATIC/HIGH —, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>

EN(H6DO)-252

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

BG:DTC P0503 — VEHICLE SPEED SENSOR INTERMITTENT/ERRATIC/HIGH —

• DTC DETECTING CONDITION:

• Immediately at fault recognition

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-01263

B55

B:

B54

A:

B56

C:

TCM

B18

C17

A10

SPEEDOMETER

CIRCUIT

i10

COMBINATION
METER

B134

11

FRONT VEHICLE
SPEED SENSOR

17

18

5

6

4

B53

B11

T4

E4

B36

i1

B11

i10

B56

C:

1 2 3 4 5 6 7

8 9 10 11 12 13 14

15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

B55

B:

1

B134

ECM

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

B36

B4 B5 B6

A4 A5 A6

C5 C6

F6

D4 D5 D6

F1

H1

C4

G6

G1

C2

K1

M1 M2

K6

L1

D1 D2

A1 A2
B1 B2

I6

J6

L2

I1

J1

H6

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

N4

P4 P5

N2

O1 O2

P1 P2

N3

O3

P3

P6

A3

B3

C3

E4 E5 E6

E1 E2

A:

B54

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

B53

1 2 3 4 5 6 7 8 9 10 11 12

EN(H6DO)-253

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK DTC P0720 ON DISPLAY.
Does the Subaru Select Monitor or OBD-II
general scan tool indicate DTC P0720?

DTC P0720 is indicated.

Check front vehi-
cle speed sensor
signal circuit.
<Ref. to AT-58,
DTC 33 FRONT
VEHICLE SPEED
SENSOR, Diag-
nostic Procedure
with Diagnostic
Trouble Code
(DTC).>

Go to step 2.

2

CHECK SPEEDOMETER OPERATION IN
COMBINATION METER.
Does speedometer operate normally?

Operates properly.

Go to step 3.

Check speedome-
ter and vehicle
speed sensor.
<Ref. to IDI-18,
Speedometer.>,
<Ref. to AT-54,
Front Vehicle
Speed Sensor.>,
<Ref. to AT-58,
Rear Vehicle
Speed Sensor.>
and <Ref. to AT-
59, Torque Con-
verter Turbine
Speed Sensor.>

3

CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from combination

meter.

3) Measure resistance between ECM and

combination meter.

Connector & terminal

(B134) No. 1 — (i10) No. 11:

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

10

Ω

Repair poor con-
tact in ECM con-
nector.

Repair harness
and connector.

NOTE:
In this case, repair
the following:

• Open circuit in
harness between
ECM and combi-
nation meter con-
nector
• Poor contact in
ECM connector
• Poor contact in
combination meter
connector
• Poor contact in
coupling connector