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

NOTE: All the stored DTCs and freeze frame data are cleared if: 1) the hybrid vehicle control ECU is changed from normal mode to check mode or vice versa; or 2) the power switch is turned from on (IG) to on (ACC) or off while in check mode. Before changing modes, always check and note any DTCs and freeze frame data.

CHECK MODE PROCEDURE
1. Check and ensure the following conditions:
  1. Auxiliary battery voltage 11 V or more.
  2. Throttle valve fully closed.
  3. Park (P) selected.
  4. A/C switch off.
2. Turn the power switch off.
3. Connect the Techstream to the DLC3.
4. Turn the power switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: Powertrain/Engine and ECT/Utility/Check Mode.
7. Switch the hybrid vehicle control ECU from normal mode to check mode.
8. Make sure that the MIL flashes as shown.
  
  Fig 1: View Of Malfunction Indicator Lamp Blinking Pattern
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Turn the power switch on (READY).
10. Make sure that the MIL turns off.
11. Simulate that the conditions of the malfunction described by the customer.
12. Check DTCs and freeze frame data using the Techstream.

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.

Safety Warning

Check Mode Procedure

Use the Manual With the Right Hardware

When to See a Mechanic