Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection

1.CHECK DTC.

Read the DTC relating the TCM using the Subaru Select Monitor.

Is DTC U0155 or U0423 displayed-

Perform the self-diagnosis of combination meter.

AT OIL TEMP Warning Light Display > INSPECTION

2.CHECK DTC.

Read the DTC relating the TCM using the Subaru Select Monitor.

Are DTCs other than U0155 and U0423 displayed-

Perform the diagnosis according to DTC.

AT OIL TEMP Warning Light Display > INSPECTION

3.CHECK COMBINATION METER.

Read DTC of combination meter.

Is DTC displayed-

Perform the diagnosis according to DTC.

AT OIL TEMP Warning Light Display > INSPECTION

4.CHECK AT OIL TEMP LIGHT.

Turn the ignition switch to ON.

Does AT OIL TEMP light illuminate and then go off in 2 seconds-

AT OIL TEMP Warning Light Display > INSPECTION

Perform the self-diagnosis of combination meter. Combination Meter System > OPERATION

5.CHECK AT OIL TEMP LIGHT.

Start the engine.

Does the AT OIL TEMP light go off-

Current condition is normal. Go back to Basic Diagnostic Procedure. Basic Diagnostic Procedure

AT OIL TEMP Warning Light Display > INSPECTION

6.CHECK DTC.

Read the DTC relating the TCM using the Subaru Select Monitor.

Is DTC displayed-

Perform the diagnosis according to DTC.

AT OIL TEMP Warning Light Display > INSPECTION

7.CHECK TCM.

Read the data of «ATF Temperature Lamp» using the Subaru Select Monitor.

Is “ON” displayed-

AT OIL TEMP Warning Light Display > INSPECTION

Perform the self-diagnosis of combination meter. Combination Meter System > OPERATION

8.CHECK TCM.

Read the data of «ATF Temp.» using the Subaru Select Monitor.

Is the display 125°C or more-

AT OIL TEMP Warning Light Display > INSPECTION

Replace the TCM. Transmission Control Module (TCM) Transmission Control Module (TCM)

9.CHECK ATF TEMPERATURE.

Check the real fluid temperature from the transmission case surface temperature.

Does it clearly differ from the «ATF Temp.» displayed on Subaru Select Monitor-

Perform the diagnosis according to DTC P0712. If there is no problem, perform the diagnosis according to DTC P0713.

When ATF temperature can be judged as actually high, perform the diagnosis again after the ATF temperature lowers.