Subaru Legacy BN/BS (2015-2019) Service Manual: Diagnostics with phenomenon inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Continuously variable transmission (diagnostics) / Diagnostics with phenomenon inspection

Symptoms	Faulty parts
Engine stalls when driving in “D” or “R” range, or selecting “N” > “D”, “N” > “R”.	• Control valve • Engine control system
While driving in “D” range, vibration occurs immediately before the stop or engine stalls.	• Control valve • Torque converter
Vehicle cannot shift while driving in “D” range.	• Control valve • TCM • Shift mechanism • Power supply system
Excessive shock when selecting “N” > “D”, and “N” > “R”.	• Control valve • TCM • F&R clutch pack • ATF deterioration or lack
Excessive shock at standing start in “D” range.	• Control valve • TCM • F&R clutch pack • ATF deterioration or lack
Engine speed increases abruptly during driving in “D” or “R” range.	• Control valve • Secondary pressure sensor • F&R clutch pack • ATF deterioration or lack
Vehicle can not start when depressing the accelerator pedal in “D” or “R” range, or acceleration is very poor. (without abrupt engine increase)	• Control valve • F&R clutch pack • Shift mechanism • Parking mechanism • Engine control system • Power supply system
Shift indicator in combination meter displays the position which differs from select lever position.	• Inhibitor switch • Select cable related • Combination meter
Manual mode enters even though the select lever and paddle shift switch is not operated.	• Manual mode switch • Paddle shift switch • Select lever • TCM
Engine speed increases abruptly in “D” or “R” range, vehicle can not start.	• F&R clutch pack • Select cable related
Manual mode can not be set	• Select lever • TCM

Diagnostic procedure without diagnostic trouble code (dtc) check shift indicator

DIAGNOSIS:• CAN communication is abnormal with the combination meter.• Combination meter malfunctionTROUBLE SYMPTOM:• Shift indicator does not display or remains displayed.• Sh ...

Drive cycle procedure

It is possible to complete diagnosis of the DTC by performing the indicated drive cycle. After the repair for the DTC, perform a necessary drive cycle and make sure the function recovers and the DTC i ...

Other materials:

Inspection
1. Check the setting by performing Keyless access system check using the Subaru Select Monitor. Keyless Access System Check > OPERATION2. Disconnect the Subaru Select Monitor. While bringing the access key, operate the touch sensor on door handle to check if door lock or unlock operates.3. Disconne ...