Subaru Legacy III (2000-2003 year). Service manual - part 995

CC-12

CRUISE CONTROL SYSTEM

INHIBITOR SWITCH

CRUISE CONTROL SYSTEM (DIAGNOS-
TICS)

CC

Page

1.

Basic Diagnostic Procedure ........................................................................2

2.

General Description ....................................................................................4

3.

Electrical Components Location..................................................................7

4.

Cruise Control Module I/O Signal................................................................8

5.

Subaru Select Monitor...............................................................................10

6.

Diagnostics Chart with Symptom ..............................................................12

7.

List of Diagnostic Trouble Code (DTC) .....................................................26

8.

Diagnostics Chart with Trouble Code........................................................27

CC-2

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

1. Basic Diagnostic Procedure

A: PROCEDURE

Step

Value

Yes

No

1

START DIAGNOSIS.
1) Perform pre-inspection. <Ref. to CC-6, 

INSPECTION, General Description.>

2) Check cruise control main switch operation.

Is cruise control main switch turned ON?

Cruise main switch is turned 
ON.

Go to step 2.

Go to symptom 1. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>

2

PREPARE SUBARU SELECT MONITOR.
Is the Subaru select monitor available?

Subaru select monitor is avail-
able.

Go to step 3.

Go to step 4.

3

PERFORM CRUISE CANCEL CONDITIONS 
DIAGNOSIS.
Perform cruise cancel conditions diagnosis. 
<Ref. to CC-10, Subaru Select Monitor.>  
Is trouble code indicated? 

Trouble code is not indicated.

Go to step 4.

Go to “List of Diag-
nostic Trouble 
Code (DTC)”. 
<Ref. to CC-26, 
List of Diagnostic 
Trouble Code 
(DTC).>

4

CHECK CRUISE CONTROL SET OPERA-
TION. 
Check cruise control set operation. 
Can cruise control be set while driving at 40 
km/h (25 MPH)? 

Cruise control can be set.

Go to step 5.

Go to symptom 2. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

5

CHECK VEHICLE SPEED IS HELD WITHIN 
SET SPEED. 
Make sure vehicle speed is held within set 
speed. 
Is vehicle speed held within set speed 

±

3 km/h 

(

±

2 MPH) ? 

Vehicle speed is held within 
set speed.

Go to step 6.

Go to symptom 3. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

6

CHECK RESUME/ACCEL OPERATION. 
Check RESUME/ACCEL operation. 
Does vehicle speed increase or return to set 
speed after RESUME/ACCEL switch has been 
pressed? 

Vehicle speed increases or 
returns to set speed.

Go to step 7.

Go to symptom 4. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

7

CHECK SET/COAST OPERATION. 
Check SET/COAST operation. 
Does vehicle speed decrease after SET/
COAST switch has been pressed? 

Vehicle speed decreases.

Go to step 8.

Go to symptom 5. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

8

CHECK CANCEL OPERATION. 
Check CANCEL operation. 
Is cruise control released after CANCEL switch 
has been pressed? 

Cruise control is released.

Go to step 9.

Go to symptom 6. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

9

CHECK CRUISE CONTROL RELEASE OP-
ERATION. 
Check cruise control release operation. 
Is cruise control released after brake pedal has 
been depressed? 

Cruise control is released.

Go to step 10.

Go to symptom 7. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

CC-3

CRUISE CONTROL SYSTEM (DIAGNOSTICS)

BASIC DIAGNOSTIC PROCEDURE

10

CHECK CRUISE CONTROL RELEASE OP-
ERATION. 
Check cruise control release operation. 
Is cruise control released after clutch pedal 
has been depressed? (MT) 

Cruise control is released.

Finish the diag-
nostics. 

Go to symptom 8. 
<Ref. to CC-12, 
SYMPTOM 
CHART, Diagnos-
tics Chart with 
Symptom.>  

Step

Value

Yes

No