At Oil Temp Warning Light Display: Diagnosis
Detecting condition:
- CAN communication is lost with the combination meter.
- Combination meter malfunction
- TCM is in special control mode.
- AT learning is not finished.
Trouble symptom:
AT OIL TEMP light remains lit after engine start.
- CHECK DTC
.
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Is DTC U0155 or U0423 displayed?
Yes : Check the combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
No : Go to 2.
- CHECK DTC
.
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Are DTCs other than U0155 and U0423 displayed?
Yes : Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
No : Go to 3.
- CHECK COMBINATION METER
.
Read the DTC of [Combination Meter] using the Subaru Select Monitor. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Are any DTCs displayed?
Yes : Perform the diagnosis according to the DTC. Ref. to COMBINATION METER (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
No : Go to 4.
- 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 TRANSMISSION (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
No : Go to 5.
- CHECK DTC
.
Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)
Are any DTCs displayed?
Yes : Perform the diagnosis according to the DTC. Ref. to TRANSMISSION (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST
No : Go to 6.
- CHECK TCM
.
Using the Subaru Select Monitor, read data of [ATF Temperature Lamp] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is [ON] displayed?
Yes : Go to 7.
No : Check the combination meter. Ref. to COMBINATION METER (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE
- CHECK TCM
.
Using the Subaru Select Monitor, read data of [ATF Temp.] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS)>DATA MONITOR
Is the display 130°C or more?
Yes : Go to 8.
No : Replace the TCM. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>TRANSMISSION CONTROL MODULE (TCM)
- 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.