AT Oil Temp Warning Light Display: Inspection

DIAGNOSIS: 

• CAN communication is lost with the combination meter.
• Combination meter malfunction
• TCM is in special control mode.
• AT learning is not finished.

TROUBLE SYMPTOM: 

• When the ignition switch is turned to ON, the AT OIL TEMP light does not illuminate.
• AT OIL TEMP light remains lit after engine start.

1. CHECK DTC. 

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

   Is DTC U0155 or U0423 displayed?

   Yes:  Perform the self-diagnosis of combination meter.

   No:  Go to  2

2. CHECK DTC. 

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

   Are DTCs other than U0155 and U0423 displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  3

3. CHECK COMBINATION METER. 

   Read DTC of combination meter.

   Is DTC displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  4

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?

   Yes:  Go to  5

   No:  Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION>SELF-DIAGNOSIS DISPLAY MODE

5. CHECK AT OIL TEMP LIGHT. 

   Start the engine.

   Does the AT OIL TEMP light go off?

   Yes:  Current condition is normal. Go back to Basic Diagnostic Procedure. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE 

   No:  Go to  6

6. CHECK DTC. 

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

   Is DTC displayed?

   Yes:  Perform the diagnosis according to DTC.

   No:  Go to  7

7. CHECK TCM. 

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

   Is "ON" displayed?

   Yes:  Go to  8

   No:  Perform the self-diagnosis of combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>Combination Meter System>OPERATION>SELF-DIAGNOSIS DISPLAY MODE

8. CHECK TCM. 

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

   Is the display 125°C or more?

   Yes:  Go to  9

   No:  Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR580)>TRANSMISSION CONTROL MODULE (TCM) Ref. to CONTINUOUSLY VARIABLE TRANSMISSION(TR690)>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?

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

   No:  When ATF temperature can be judged as actually high, perform the diagnosis again after the ATF temperature lowers.