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HOMESERVICE MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM (1NZ-FE)SFI SYSTEMDTC P2A00 A/F SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 1)CONFIRMATION DRIVING PATTERN
2009 Toyota Yaris S, 4D Hatchback

Confirmation Driving Pattern

2009 Toyota Yaris S, 4D HatchbackSECTION Confirmation Driving Pattern

HINT:

Performing this confirmation pattern will activate the A/F sensor response monitor.

Fig 1: Driving Pattern Of Vehicle Speed And Time
G04828271Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Connect a Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the tester ON.
  4. Clear DTCs (where set) (See DTC CHECK/CLEAR  ).
  5. Select the following menu items: Powertrain/Engine and ECT/Monitor/O2 Sensor/Details.
  6. Check that RES RATE B1S1 is Incomplete.
  7. Start the engine and warm it up.
  8. Drive the vehicle at a constant speed between 25 mph and 75 mph (40 km/h and 120 km/h) for 3 minutes.
  9. Check the Monitor Information values on the tester by selecting the following menu items: Powertrain/Engine and ECT/Monitor/O2 Sensor/Details/RES RATE B1S1/Details.
  10. If the values indicated on the tester do not update, perform READINESS MONITOR DRIVE PATTERN for the A/F sensor and the heated oxygen sensor (See READINESS MONITOR DRIVE PATTERN  ).

    HINT:

    Completion of all monitors for the A/F and HO2 sensors is required to update the value in RES RATE B1S1.

  11. Note the value of the RES RATE B1S1.
  12. Select the following menu items: Powertrain/Engine and ECT/Trouble Codes/Pending.
  13. Check if any DTCs (any pending DTCs) are set.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.