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Subaru Legacy Service Manual: Basic diagnostic procedure procedure

Subaru Legacy Service Manual / Cruise control system (diagnostics) / Basic diagnostic procedure procedure

CAUTION:

When performing diagnosis, observe the legal speed limit on the road.

The cancel code will also appear when the cruise control is cancelled by the driver’s operation. Do not confuse them.

Be sure to get an assistant to support the diagnosis while driving, and have him/her operate the select monitor.

STEPCHECKYESNO

1.CHECK MALFUNCTION INDICATOR LIGHT.

Make sure the malfunction indicator light illuminates.

Does the malfunction indicator light illuminate-

Basic Diagnostic Procedure > PROCEDURE

Basic Diagnostic Procedure > PROCEDURE

2.CHECK CRUISE INDICATOR LIGHT.

Make sure the cruise indicator light blinks.

Does the cruise indicator light blink-

Basic Diagnostic Procedure > PROCEDURE

Basic Diagnostic Procedure > PROCEDURE

3.CHECK CRUISE SWITCH OPERATION.

Check the CRUISE switch operation. (Check the illumination of the CRUISE indicator.)

Is the CRUISE switch turned on- (Does the CRUISE indicator illuminate-)

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 1. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

4.CHECK CRUISE CONTROL SET OPERATION.

Check the cruise control setting operation.

Can the cruise control be set while driving at 40 km/h (25 MPH) or more-

Basic Diagnostic Procedure > PROCEDURE

Basic Diagnostic Procedure > PROCEDURE

5.CHECK DTC.

Read all DTCs using the Subaru Select Monitor.

Is an engine or ABS/VDC related DTC displayed-

Record the DTC. Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 2. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

6.CHECK FREEZE FRAME DATA.

Using the Subaru Select Monitor, check the Freeze Frame Data or Information in Trouble State.

Was the Freeze Frame Data or Information in Trouble State recorded-

Record the data. Perform the diagnosis according to the engine or ABS/VDC related DTC.

Perform the diagnosis according to the engine or ABS/VDC related DTC.

7.CHECK CANCEL CODE.

Using the Subaru Select Monitor, read the cancel codes.

NOTE:

Do not turn the ignition switch to OFF after the cruise control is deactivated.

Do not operate the cruise control command switch after the cruise control is deactivated.

If the above is performed, the cancel code will be cleared.

Is it possible to read the cancel codes-

Perform the diagnosis according to the cancel code. List of Cancel Code > LIST

Basic Diagnostic Procedure > PROCEDURE

8.CHECK SET INDICATOR.

Check the illumination of the SET indicator.

Does the SET indicator illuminate-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 3. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

9.CHECK VEHICLE SPEED IS HELD WITHIN SET SPEED.

Make sure the vehicle speed is held within set speed.

Is the vehicle speed kept within setting speed ±3 km/h (±2 MPH)- (Make sure that on a level road.)

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 4. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

10.CHECK RES/+ OPERATION.

Check the RES/+ switch operation.

Does the vehicle speed increase or return to set speed after RES/+ switch has been pressed-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 5. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

11.CHECK SET/− OPERATION.

Check the SET/− switch operation.

Does the vehicle speed decrease after SET/− switch has been pressed-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 6. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

12.CANCEL OPERATION CHECK.

Check the CANCEL switch operation.

Is the cruise control released after CANCEL switch has been pressed-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 7. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

13.CHECK CRUISE CONTROL RELEASE OPERATION.

Check the cruise control release operation.

Is the cruise control released after brake pedal has been depressed-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 8. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

14.CHECK CRUISE CONTROL RELEASE OPERATION.

Check the cruise control release operation.

Is the cruise control released after shifting to the neutral position-

Basic Diagnostic Procedure > PROCEDURE

Go to phenomenon 9. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

15.CHECK CRUISE CONTROL RELEASE OPERATION.

Check the cruise control release operation.

Is the cruise control released after depressing the clutch pedal-

Finish the diagnosis.

Go to phenomenon 10. Diagnostics with Phenomenon > DIAGNOSTIC PROCEDURE WITH PHENOMENON

Cruise control system (diagnostics)
...

Electrical component location location
(1)Inhibitor switch (CVT model)(5)Neutral position switch (MT model)(8)Data link connector(2)TCM (engine type: EZ)(6)Cruise indicator light and cruise set indicator light(9)Clutch switch (MT model)(3) ...

Other materials:

Inspection
STEPCHECKYESNO1.CHECK DTC.Is engine DTC displayed- Read Diagnostic Trouble Code (DTC)Check the appropriate DTC using the “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC) Oil Pressure System > INSPECTION2.CHECK COMBINATION METER.1) Turn the ignition switch ...

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