Test drive

Perform test drive to check if the DTC recurs.

Fig 1: Confirmation Driving Pattern

Courtesy of SUBARU OF AMERICA, INC.

1. Connect the SSM3 to the DLC3.
2. Turn the ignition switch to ON.
3. Turn on the SSM3.
4. Follow the SSM3 on-screen instructions to clear the DTCs. (Refer to CHECKING/CLEARING DTC )
5. Turn the ignition switch to OFF, and wait for 30 seconds.
6. Turn the ignition switch to ON.
7. Turn on the SSM3.
8. Start the engine and let it warm up until the engine coolant temperature stabilizes. (at 75°C {167°F} or more).
9. Perform driving test as follows.
   WARNING: When performing this driving test, always observe the applicable traffic laws such as the speed limit.
   1. Drive at 80 km/h {50 MPH} or more for 20 minutes or more.
      NOTE: Keep the engine load constant as much as possible while driving the vehicle.
   2. Stop the vehicle.
   3. Idle the engine for 1 minute or more.
10. Follow the SSM3 on-screen instructions to check the DTC. (Refer to CHECKING/CLEARING DTC )

    Checking output condition of the catalyst deterioration detection sensor

    Fig 2: Confirmation Driving Pattern

    Courtesy of SUBARU OF AMERICA, INC.

1. Connect the SSM3 to the DLC3. (A)
2. Turn the ignition switch to ON. (B)
3. Turn on the SSM3. (C)
4. Start the engine, turn off all the accessory switches, and wait until the engine warms up and the coolant temperature stabilizes. (at 75°C {167°F} or more) (D)
5. Keep the engine speed between 2500 and 3000 r/min for approximately 3 minutes. (E)
6. After that, keep the engine speed at 3000 r/min for 2 seconds, and then at 2000 r/min for 2 seconds. (F)
7. Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[A/F Sensor #11], [Oxygen sensor #12]
8. Check the data display.
   NOTE:

   • If output voltage of the air/fuel ratio sensor or the oxygen sensor do not change or noise is emitted, malfunction may exist in the sensors.
   • If output voltage of both sensors remain in lean or rich state, air/fuel ratio may be extremely lean or rich.
   • When catalyst becomes deteriorated, output voltage of oxygen sensors changes significantly even under normal driving condition.
   Fig 3: Air/Fuel Ratio Sensor And Oxygen Sensor Output Wave Forms

   Courtesy of SUBARU OF AMERICA, INC.