Subaru Legacy III (2000-2003 year). Service manual — part 1003

CC-32

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH TROUBLE CODE

D: DTC 35 AND 36 ACTUATOR MOTOR

DIAGNOSIS:
Open or poor contact of cruise control actuator motor.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:

CC-00083

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

14

6

11

B94

CRUISE CONTROL

MODULE

3

4

1

5

2

6

B7

CRUISE CONTROL

ACTUATOR

7

5

13

B7

1

3

4 5 6

2

CC-33

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH TROUBLE CODE

Step

Value

Yes

No

1

CHECK POWER SUPPLY.
1) Turn ignition switch OFF.
2) Disconnect harness connector from cruise

control actuator.

3) Turn ignition switch ON.
4) Turn cruise control main switch ON.
5) Measure voltage between cruise control

actuator harness connector terminal and
chassis ground.

Terminals

(B7) No. 4 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

Check harness for
open or short
between cruise
control module
and cruise control
actuator.

2

CHECK GROUND CIRCUIT OF ACTUATOR.
1) Turn ignition switch and cruise control main

switch OFF.

2) Measure resistance between cruise control

actuator harness connector terminal and
chassis ground.

Terminals

(B7) No. 6 — Chassis ground:

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

10

Ω

Go to step 3.

Repair harness.

3

MEASURE RESISTANCE OF ACTUATOR.
Measure resistance of cruise control actuator
motor.

Terminals

No. 4 — No. 1:
No. 4 — No. 2:
No. 4 — No. 5:

Is the measured value same as the specified
value?

Approximately 5

Ω

Go to step 4.

Replace cruise
control actuator.
<Ref. to CC-4,
Actuator.>

4

CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
1) Disconnect harness connector from cruise

control module.

2) Measure resistance between cruise control

module harness connector terminal and
cruise control actuator harness connector
terminal.

Connector & terminal

(B7) No. 1 — (B94) No. 7:

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

10

Ω

Go to step 5.

Repair harness.

5

CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
Measure resistance between cruise control
module harness connector terminal and cruise
control actuator harness connector terminal.

Connector & terminal

(B7) No. 5 — (B94) No. 5:

Is the measured value less than the specified
value?

10

Ω

Replace cruise
control module.
<Ref. to CC-6,
Cruise Control
Module.>

Repair harness.

CC-34

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH TROUBLE CODE

E: DTC 37 ACTUATOR MOTOR CLUTCH

DIAGNOSIS:
Open or poor contact of cruise control actuator motor clutch.
TROUBLE SYMPTOM:
Cruise control cannot be set. (Cancelled immediately.)
WIRING DIAGRAM:

CC-00083

B94

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

14

6

11

B94

CRUISE CONTROL

MODULE

3

4

1

5

2

6

B7

CRUISE CONTROL

ACTUATOR

7

5

13

B7

1

3

4 5 6

2

CC-35

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

DIAGNOSTICS CHART WITH TROUBLE CODE

Step

Value

Yes

No

1

CHECK POWER SUPPLY.
1) Turn ignition switch OFF.
2) Disconnect harness connector from cruise

control actuator.

3) Turn ignition switch ON.
4) Turn cruise control main switch ON.
5) Measure voltage between cruise control

actuator harness connector terminal and
chassis ground.

Terminals

(B7) No. 4 (+) — Chassis ground (

−−−−

):

Does the measured value exceed the spec-
ified value?

10 V

Go to step 2.

Check harness for
open or short
between cruise
control module
and cruise control
actuator.

2

CHECK GROUND CIRCUIT OF ACTUATOR.
1) Turn ignition switch and cruise control main

switch OFF.

2) Measure resistance between cruise control

actuator harness connector terminal and
chassis ground.

Terminals

(B7) No. 6 — Chassis ground:

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

10

Ω

Go to step 3.

Repair harness.

3

MEASURE RESISTANCE OF ACTUATOR
CLUTCH.
Measure resistance of cruise control actuator
clutch.

Terminals

No. 3 — No. 6:

Is the measured value same as the specified
value?

Approximately 39

Ω

Go to step 4.

Replace cruise
control actuator.
<Ref. to CC-4,
Actuator.>

4

CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
1) Disconnect harness connector from cruise

control module.

2) Measure resistance between cruise control

module harness connector terminal and
cruise control actuator harness connector
terminal.

Connector & terminal

(B7) No. 2 — (B94) No. 13:

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

10

Ω

Go to step 5.

Repair harness.

5

CHECK HARNESS BETWEEN ACTUATOR
AND CRUISE CONTROL MODULE.
Measure resistance between cruise control
module harness connector terminal and cruise
control actuator harness connector terminal.

Connector & terminal

(B7) No. 3 — (B94) No. 14:

Is the measured value less than the specified
value?

10

Ω

Replace cruise
control module.
<Ref. to CC-6,
Cruise Control
Module.>

Repair harness.