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Subaru Legacy Service Manual: Basic diagnostic procedure procedure

STEPCHECKYESNO

1.CHECK PRE-INSPECTION.

1) Ask the customer when and how the trouble occurred using the interview check list. Check List for Interview

2) Before performing diagnostics, check the following items which might affect CVT problems.

General inspection General Description > INSPECTION

Disconnection of harness connector

Visual check for harness damage

Oil leakage

Stall speed test Stall Test Stall Test

Secondary pressure test Secondary Pressure (Line Pressure) Test Secondary Pressure (Line Pressure) Test

Transfer clutch pressure test Transfer Clutch Pressure Test Transfer Clutch Pressure Test

Time lag test Time Lag Test Time Lag Test

Road test Road Test Road Test

Inhibitor switch Inhibitor Switch Inhibitor Switch

Is the item that is thought to influence the CVT problem working properly-

Basic Diagnostic Procedure > PROCEDURE

Repair the items which may be affecting the CVT trouble.

2.CHECK AT OIL TEMP LIGHT.

Turn the ignition switch to ON and wait for at least 2 seconds.

Does the AT OIL TEMP light illuminate-

Basic Diagnostic Procedure > PROCEDURE

Check the AT OIL TEMP light.

3.CHECK AT OIL TEMP LIGHT.

Start the engine and wait for 2 seconds or more.

Does the AT OIL TEMP light blink-

Basic Diagnostic Procedure > PROCEDURE

Basic Diagnostic Procedure > PROCEDURE

4.CHECK DTC DISPLAY.

Read the DTC.

NOTE:

If the communication function of Subaru Select Monitor cannot be executed normally, check the communication circuit. Diagnostic Procedure for Subaru Select Monitor Communication > COMMUNICATION FOR INITIALIZING IMPOSSIBLE

Is DTC displayed on Subaru Select Monitor-

Record the DTC, time stamp and freeze frame data.
Basic Diagnostic Procedure > PROCEDURE

NOTE:

For the time stamp, refer to LAN section. General Description > CAUTION

Depending on DTCs, time stamp may not be stored.

Basic Diagnostic Procedure > PROCEDURE

5.PERFORM GENERAL DIAGNOSTICS.

1) Inspect using “Diagnostic Procedure without Diagnostic Trouble Code (DTC)”. Diagnostic Procedure without Diagnostic Trouble Code (DTC)

2) Inspect using “Diagnostics with Phenomenon”. Diagnostics with Phenomenon

3) Perform the Inspection Mode. Inspection Mode

4) Read the DTC.

Is DTC displayed on Subaru Select Monitor-

Basic Diagnostic Procedure > PROCEDURE

Finish the diagnosis.

6.PERFORM DIAGNOSIS.

1) Inspect by referring to “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”. Diagnostic Procedure with Diagnostic Trouble Code (DTC)

NOTE:

For the DTC table, refer to “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)

2) Repair the trouble cause.

3) Perform the Clear Memory Mode.

4) Perform the Inspection Mode. Inspection Mode

5) Read the DTC.

Is DTC displayed on Subaru Select Monitor-

Inspect by referring to “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”. Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Finish the diagnosis.

Active test operation
CAUTION:• Be sure to perform the active test while the engine is not running.• After executing the active test, execute the Clear Memory Mode.1. On «Start» display, select «Diagnosis». ...

Check list for interview check
Check the following items when a problem has occurred.NOTE:Use copies of this page for interviewing customers.Customer’s name Date of purchase Date of repair Transmission modelTransmissionV.I.N. ...

Other materials:

Dtc b1877 short in front seat cushion airbag lh (to ground)
DIAGNOSIS START CONDITION:Ignition voltage is 10 V to 16 V.DTC DETECTING CONDITION:GND short circuit failure (shorted to ground in main harness, shorted to ground in front seat cushion airbag LH, shorted to ground in airbag CM internal circuit)CAUTION:Before performing diagnosis, refer to “CAU ...

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