Test Methods

Temporarily attach the ST to a suitable place in the driver's compartment, remove the blind plug located in front of the toe board and pass the hose of the ST to the engine compartment.
ST 498575400 OIL PRESSURE GAUGE ASSY

Fig 1: Removing Blind Plug
Courtesy of SUBARU OF AMERICA, INC.
Remove the test plug and install ST instead.
ST 498897200 OIL PRESSURE GAUGE ADAPTER

Fig 2: Removing Test Plug
Courtesy of SUBARU OF AMERICA, INC.
Connect ST1 with ST2.
ST1 498897200 OIL PRESSURE GAUGE ADAPTER

ST2 498575400 OIL PRESSURE GAUGE ASSY
Check for duty ratio changes by opening and closing throttle valve using Subaru Select Monitor.
1. Insert the cartridge to Subaru Select Monitor. Refer to PREPARATION TOOL , General Description.
  
  Fig 3: Inserting Cartridge To Subaru Select Monitor
  Courtesy of SUBARU OF AMERICA, INC.
2. Connect Subaru Select Monitor to data link connector.
Check line pressure in accordance with the following chart.