Line Pressure Test: Inspection

CAUTION:

Vehicle components are extremely hot immediately after driving and performing the line pressure test. Be wary of receiving burns from heated parts.
Make sure no other person is around the vehicle during line pressure test measurement.
After performing the line pressure test measurement, adjust the CVTF level.

NOTE:

If the pulley, variator chain, clutch or brake show signs of slipping or shift feel is not correct, check the line pressure.
Connect Subaru Select Monitor to vehicle so as to measure the engine speed and actual line pressure.
In many cases, slippage or driving inability may be due to insufficient oil pressure for the operation of clutch, brake or control valve.

Lift up the vehicle.
Remove the plug.

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Attach ST1, ST2 and ST3 to transmission.
Preparation tool:

ST1: OIL PRESSURE GAUGE ASSY (18801AA000)

ST2: PRESSURE GAUGE ADAPTER (18681AA010)

ST3: OIL PRESSURE ADAPTER SET (498897700)

NOTE: Use the ST2 with genuine O-ring (part No. 806911080) attached.

Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Set the gauge so that it can be seen from the driver's seat.
Using the Subaru Select Monitor, check if the throttle valve operates when you depress the accelerator pedal. Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>DATA MONITOR>LIST .
Check the engine oil level. Ref. to LUBRICATION (H4DOTC)>ENGINE OIL>INSPECTION .
Check the engine coolant level. Ref. to COOLING (H4DOTC)>ENGINE COOLANT>INSPECTION .
Adjust the CVTF level. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR690)>CVTF>ADJUSTMENT .
Increase the CVTF temperature to 60 - 80°C (140 - 176°F) by idling the engine with the select lever shifted to "N" or "P" range.
Hold down the pre-collision brake OFF switch to turn OFF the pre-collision brake. (With EyeSight)
Shift the select lever to "D" range.
Depress the accelerator pedal to the full while fully depressing the brake pedal with your left foot.

Immediately after the engine speed becomes steady, record the reading of the line pressure, engine speed and actual line pressure on Subaru Select Monitor. And then release the accelerator pedal. Shift the select lever to "N" range, and cool down the engine by idling it for one minute or more.

NOTE:

Do not continue the stall test for 5 seconds or more at a time (from fully closed throttle, fully open throttle to line pressure reading). Failure to follow this instruction will cause the engine oil and CVTF to deteriorate and the clutch and brake to be adversely affected.
After performing the line pressure test, be sure to cool down the engine for at least one minute with the select lever set in "P" or "N" range and with the idle speed at 1, 200 r/min or less.
Under each condition, check that the measured pressure matches almost totally with actual line pressure.
When both measured pressure and actual line pressure are out of specification, judge as control valve malfunction.
The value at stall is for reference because the pressure changes under different conditions or circumstances.
The value at idling is steady because it is not affected by any condition or circumstance.

Line pressure standard
	Range	Throttle	Brake	Line pressure (MPa (kgf/cm² , psi))
Stall	D, R	Full open	ON	4.5 - 6 (45.9 - 61.2, 652 - 870)
Idling	P, N	Full closed	OFF	0.5 - 1.5 (5.1 - 15.3, 72 - 218)

Remove the ST.
Install the plugs with new O-rings.
CAUTION:
- Before installing O-rings, apply sufficient amount of CVTF to avoid damage and deformation.
- Use SUBARU genuine CVTF.
- Be careful not to incorrectly install or fail to install O-rings and other such parts.
Tightening torque:

50 N.m (5.1 kgf-m, 36.9 ft-lb)