Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2009YARIS S, 4D HATCHBACKREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (1NZ-FE)SFI SYSTEMCHECK MODE PROCEDURE

2009 Toyota Yaris S, 4D Hatchback

Check Mode Procedure

2009 Toyota Yaris S, 4D HatchbackSECTION Check Mode Procedure

HINT:

Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected by normal mode.

NOTE: All the stored DTCs and freeze frame data are erased if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or OFF while in check mode. Before changing modes, always check and make a note of any DTCs and freeze frame data.

CHECK MODE PROCEDURE (Using a Techstream)
1. Check and ensure the following conditions:
  1. Battery positive voltage 11 V or more.
  2. Throttle valve fully closed.
  3. Transmission in the P or N (neutral) positions.
  4. A/C switch OFF.
2. Turn the ignition switch to OFF.
3. Connect a Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the tester ON.
6. Select the following menu items: Powertrain/Engine and ECT/Utility/Check Mode.
7. Switch the ECM from normal mode to check mode.
8. Make sure the MIL flashes as shown in the illustration.
9. Start the engine.
10. Make sure the MIL turns off.
11. Simulate the conditions of the malfunction described by the customer.
12. Check DTCs and freeze frame data using the tester.
  
  Fig 1: MIL Flashes Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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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.