Subaru Legacy III (2000-2003 year). Manual - part 496

EN(H4DOSTC)-154

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

6

CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?

There is poor contact.

Repair the poor 
contact in ECM 
connector.

Replace the ECM.  
<Ref. to 
FU(H4DOSTC)-
40, Engine Con-
trol Module.>

Step

Value

Yes

No

EN(H4DOSTC)-155

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H4DOSTC)-156

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

AG:DTC P0500 — VEHICLE SPEED SENSOR —

CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOSTC)-35, 
OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOSTC)-33, Inspection 
Mode.> .
• WIRING DIAGRAM:

EN-00946

E

E

i10

i10

i1

B36

B17

B22

E3

BATTERY

IGNITION
RELAY

COMBINATION
METER

B56

TRANSMISSION
CONTROL
MODULE

VEHICLE
SPEED
SENSOR

B134

B134

B56

B157

B157

ECM

38

37

1

No.15

B22

11

17

2

3

16

1

10

11 12 13

14 15 16

17
18

19

20

21 22 23

24 25 26

27
28

29

30

31 32 33

34 35 36

37
38

1

2

9

3

4

5

6

7

8

1 2 3 4
5 6 7 8
9 10 11 12

13 14 15 16

1 2 3 4

10 11 12

19 20 21

13

5

6

14 15

7

8 9

16 17

18

22

E4

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

1 2 3

B17

AT

MT

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

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

EN(H4DOSTC)-157

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

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

Operates normally.

Go to step 2.

Check the speed-
ometer and vehi-
cle speed sensor. 
<Ref. to IDI-19, 
Speedometer.>

2

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

meter.

3) Measure the 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 the poor 
contact in ECM 
connector.

Repair the har-
ness and connec-
tor.

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