Subaru Legacy III (2000-2003 year). Manual - part 374

EN(H6DO)-298

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

7

CHECK INHIBITOR SWITCH GROUND LINE.
Measure resistance of harness between inhibi-
tor switch connector and engine ground.

Connector & terminal

(T7) No. 12 — Engine ground:

Is the measured value less than the specified 
value?

5 

Ω

Go to step 8.

Repair open circuit 
in harness 
between inhibitor 
switch connector 
and starter motor 
ground line.

NOTE:
In this case, repair
the following:
• Open circuit in 
harness between 
inhibitor switch 
connector and 
starter motor 
ground line
• Poor contact in 
starter motor con-
nector
• Poor contact in 
starter motor 
ground
• Starter motor

8

CHECK INHIBITOR SWITCH.
By moving select lever to “N” and “P” positions, 
measure resistance between inhibitor switch 
connector socket terminal.

Terminals

No. 7 — No. 12:

Is the measured value less than the specified 
value?

1 

Ω

Go to step 9.

Replace inhibitor 
switch. <Ref. to 
AT-49, Inhibitor 
Switch.>

9

CHECK SELECTOR CABLE CONNECTION.
Is there any fault in selector cable connection 
to inhibitor switch?

There is a malfunction.

Repair selector 
cable connection. 
<Ref. to CS-12, 
Select Cable.>

Contact SUBARU 
distributor service.

NOTE:
Inspection by DTM
is required, be-
cause probable
cause is deteriora-
tion of multiple
parts.

Step

Value

Yes

No

EN(H6DO)-299

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

EN(H6DO)-300

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

CD:DTC P0864 — TCM COMMUNICATION CIRCUIT RANGE/PERFORMANCE —

• DTC DETECTING CONDITION:

• Two consecutive driving cycles with fault

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-01099

B56

B135

20

21

B135 ECM

TCM

B56

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

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

EN(H6DO)-301

ENGINE (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK DRIVING CONDITION.
1) Start and warm-up the engine until the radi-

ator fan makes one complete rotation.

2) Drive the vehicle.

Is AT shift control functioning properly?

Operates properly.

Go to step 2.

Replace TCM. 
<Ref. to AT-76, 
Transmission Con-
trol Module 
(TCM).>

2

CHECK ACCESSORY.
Are car phone and/or CB installed on vehicle?

Equipped.

Repair grounding 
line of car phone 
or CB system.

Replace TCM. 
<Ref. to AT-76, 
Transmission Con-
trol Module 
(TCM).>