AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > AT Oil Temp Warning Light Display

INSPECTION

DIAGNOSIS:

The ATF temperature warning light circuit is open or shorted.

TROUBLE SYMPTOM:

When the ignition switch is turned to ON, the ATF temperature warning light does not illuminate.

WIRING DIAGRAM:

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1.CHECK ATF TEMPERATURE WARNING LIGHT.

Turn the ignition switch to ON.

Does the ATF temperature warning light illuminate?

Replace the combination meter.

2.CHECK ATF TEMPERATURE WARNING LIGHT.

After the ignition switch is ON, wait for at least 2 seconds.

Does the ATF temperature warning light illuminate?

3.CHECK ATF TEMPERATURE WARNING LIGHT.

Start the engine.

Does the ATF temperature warning light go off?

Normal. Go back to “Basic Diagnostic Procedure”.

4.CHECK SUBARU SELECT MONITOR COMMUNICATION.

Connect the Subaru Select Monitor to the data link connector.

Is the communication between Subaru Select Monitor and TCM normal?

Check the power supply ground circuit of TCM and Subaru Select Monitor communication.

5.CHECK TCM.

1) Display the current data of TCM using Subaru Select Monitor.

2) Read the data of “Diagnosis Light”.

Is ON displayed?

Replace the TCM.

6.CHECK BODY INTEGRATED UNIT.

1) Display the current data of body integrated unit using Subaru Select Monitor.

2) Read the data of “ATF temperature light”.

Is “ON” displayed?

Replace the combination meter assembly.

Check DTC of body integrated unit.

7.CHECK TCM.

1) Display the current data of TCM using Subaru Select Monitor.

2) Read the data of “Diagnosis Light”.

Is ON displayed?

Replace the TCM.

8.CHECK BODY INTEGRATED UNIT.

1) Display the current data of body integrated unit using Subaru Select Monitor.

2) Read the data of “ATF temperature light”.

Is “ON” displayed?

Check DTC of body integrated unit. Perform the diagnosis according to DTC.

Replace the combination meter.