AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > AT OIL TEMP Warning Light Display

INSPECTION

DIAGNOSIS:

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?

Perform self diagnosis of 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 turn 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) Connect the Subaru Select Monitor, and display the current data of the TCM.

2) Read the data of the “Diagnosis Lamp”.

Is “ON” displayed?

Replace the TCM.

6.CHECK BODY INTEGRATED UNIT.

1) Connect the Subaru Select Monitor, and display the current data of the body integrated unit.

2) Read the data of the “ATF Temperature Lamp”.

Does the display show “ON”?

Replace the combination meter assembly.

Check the DTC of body integrated unit.

7.CHECK TCM.

1) Connect the Subaru Select Monitor, and display the current data of the TCM.

2) Read the data of the “Diagnosis Lamp”.

Is “ON” displayed?

Replace the TCM.

8.CHECK BODY INTEGRATED UNIT.

1) Connect the Subaru Select Monitor, and display the current data of the body integrated unit.

2) Read the data of the “ATF Temperature Lamp”.

Does the display show “ON”?

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

Perform self diagnosis of the combination meter.