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

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

INSPECTION

DIAGNOSIS:

AT OIL TEMP light circuit is open or shorted.

TROUBLE SYMPTOM:

When the ignition switch is turned to ON, the AT OIL TEMP light does not illuminate.

WIRING DIAGRAM:

STEP	CHECK	YES	NO
1.CHECK AT OIL TEMP LIGHT. Turn the ignition switch to ON.	Does the AT OIL TEMP light illuminate?		Perform the self-diagnosis of combination meter.
2.CHECK AT OIL TEMP LIGHT. Turn the ignition switch to ON and wait for at least 2 seconds.	Does the AT OIL TEMP light illuminate?
3.CHECK AT OIL TEMP LIGHT. Start the engine.	Does the AT OIL TEMP light go off?	Normal. Go back to Basic Diagnostic Procedure.
4.CHECK SUBARU SELECT MONITOR COMMUNICATION. Connect the Subaru Select Monitor to 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 Lamp” using Subaru Select Monitor.	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 “ATF Temperature Lamp” using the Subaru Select Monitor.	Is “ON” displayed?	Replace the combination meter assembly.	Check DTC of body integrated unit.
7.CHECK TCM. NOTE: If the ATF temperature is 138°C or more, cool down till the temperature is 137°C or less. 1) Display the current data of TCM using Subaru Select Monitor. 2) Read the data of “Diagnosis Lamp” using Subaru Select Monitor.	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 “ATF Temperature Lamp” using the Subaru Select Monitor.	Is “ON” displayed?	Check DTC of body integrated unit. Perform the diagnosis according to DTC.	Perform the self-diagnosis of combination meter.