AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > Basic Diagnostic Procedure

PROCEDURE

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1.CHECK PRE-INSPECTION.

1) Ask the customer when and how the trouble occurred using the interview check list.

2) Check the following items which may be affecting the AT trouble.

• General inspection

• Disconnection of harness connector

• Visual check for harness damage

• Oil leakage

• Stall speed test

• Line pressure test

• Transfer clutch pressure test

• Time lag test

• Road test

• Inhibitor switch

Is the item that might influence the AT problem normal?

Repair or replace items which might affect the AT problem.

2.CHECK ATF TEMPERATURE WARNING LIGHT.

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

Does the ATF temperature warning light illuminate?

Check the ATF temperature warning light.

3.CHECK ATF TEMPERATURE WARNING LIGHT.

Start the engine and wait for 2 seconds or more.

Is the ATF temperature warning light blinking?

4.CHECK DTC.

Read the DTC.

NOTE:

If the communication function of Subaru Select Monitor cannot be executed normally, check communication circuit.

Is DTC displayed on the Subaru Select Monitor?

NOTE:

Record all DTC.

5.PERFORM GENERAL DIAGNOSTICS.

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

2) Inspect using “Diagnostics with Phenomenon”.

3) Perform the Inspection Mode.

4) Read the DTC.

Is DTC displayed on the Subaru Select Monitor?

Finish the diagnosis.

6.PERFORM DIAGNOSIS.

1) Inspect using “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”.

NOTE:

Refer to “List of Diagnostic Trouble Code (DTC)” for DTC.

2) Repair the trouble cause.

3) Perform the Clear Memory Mode.

4) Perform the Inspection Mode.

5) Read the DTC.

Is DTC displayed on the Subaru Select Monitor?

Inspect using “Diagnostic Procedure with Diagnostic Trouble Code (DTC)”.

Finish the diagnosis.