AUTOMATIC TRANSMISSION (DIAGNOSTICS)(4AT) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC DETECTING CONDITION:

Vehicle sensor, torque converter turbine speed sensor or control valve malfunction

TROUBLE SYMPTOM:

• Shift point is too high or too low.

• Excessive shift shock

• Tight corner braking phenomenon occurs.

• Gear is not shifted to reverse.

• Gear position is held by fail safe function.

STEP	CHECK	YES	NO
1.CHECK THROTTLE OPENING ANGLE SENSOR. Read the diagnostic trouble code (DTC) of engine using Subaru Select Monitor.	Is DTC P0122, P0123, P0222, P0223, P2109 and P2135 displayed?	Perform the diagnosis according to DTC.
2.CHECK DTC.	Is DTC P1718 displayed?	Perform the diagnosis according to DTC.
3.CHECK AT VEHICLE SPEED SENSOR CIRCUIT. Perform the diagnosis according to DTC P0720.	Is there any trouble?	Check the harness of the front vehicle speed sensor circuit, and repair the defective part.
4.CHECK AT TURBINE REVOLUTION SPEED SENSOR CIRCUIT. Perform the diagnosis according to DTC P0715.	Is there any trouble?	Check the torque converter turbine speed sensor circuit.	There are malfunctions in TCM, TCM connector poor contact, or transmission assembly mechanical malfunction.