Subaru Legacy (2005 year). Manual - part 1023

CC(diag)-29

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

E: DTC 16 IGNITION SWITCH

TROUBLE SYMPTOM:
Cruise control cannot be set.
WIRING DIAGRAM:
• 2.0 L turbo model, 3.0 L model, 2.5 L EC, K4 and EK model

CC-00364

B137

ECM

D14

D:

B137

9

30

29

28

31

20

19

18

22

21

10

12

11

14

24

27

26

17

16

1

2

3

4

5

6

7

13

23

15

25

8

D:

MAIN SBF

F/B  No.12

SBF-6

IGNITION
 SWITCH

BATTERY

CC(diag)-30

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• 2.0 L non-turbo model, 2.5 L KS, KA model

CC-00365

B135

ECM

B13

B:

MAIN SBF

F/B  No.12

SBF-6

IGNITION
 SWITCH

BATTERY

B135

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

29 30 31

32 33

34 35

B:

CC(diag)-31

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK IGNITION SWITCH CIRCUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ECM harness connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between harness con-
nector terminal and chassis ground.

Connector & terminal

2.0 L turbo model, 3.0 L model, 2.5 L EC, 
K4 and EK model:

(B137) No. 14 (+) — Chassis ground (

−

):

2.0 L non-turbo model, 2.5 L KS, KA mod-
el:

(B135) No. 13 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Check poor con-

tact in ECM con-
nector.

• Check fuse No. 
12 (in fuse & relay 
box).
• Check the har-
ness for open or 
short circuit 
between ignition 
switch and ECM.

CC(diag)-32

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

F: DTC 22 AND 32 VEHICLE SPEED SENSOR

DIAGNOSIS:
Disconnection or short circuit of vehicle speed sensor system.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)

Step

Check

Yes

No

1

CHECK ABS WARNING LIGHT.
1) Turn the ignition switch to ON.
2) After the combination meter initial operation 
is completed, confirm that the ABS warning 
light continues to illuminate.

Does the ABS warning light 
continue to illuminate?

Check ABSCM or 
VDCCM <Ref. to 
ABS(diag)-2, 
Basic Diagnostic 
Procedure.> or 
<Ref. to 
VDC(diag)-2, 
Basic Diagnostic 
Procedure.>

Go to step 2.

2

CHECK LAN COMMUNICATION CIRCUIT 
ERROR DISPLAY.
Check that the communication error is dis-
played on the odo/trip meter in combination 
meter.

Is the error code “Er xx” dis-
played on odo/trip meter?

Check the LAN 
communication cir-
cuit. <Ref. to 
LAN(diag)-2, Basic 
Diagnostic Proce-
dure.>

Replace the ECM. 
<Ref. to FU(H4SO 
2.0)-34, Engine 
Control Module 
(ECM).> <Ref. to 
FU(H4SO 2.5)-37, 
Engine Control 
Module (ECM).> 
<Ref. to 
FU(H4DOTC)-34, 
Engine Control 
Module (ECM).> 
<Ref. to 
FU(H6DO)-34, 
Engine Control 
Module (ECM).>