Check Mode Procedure

WARNING: This page is about a different car, the 2012 Lexus GX 460. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

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

NOTE:

All the stored DTCs and freeze frame data are cleared if: 1) the ECM is changed from normal mode to check mode or vice versa; or 2) the engine 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 that the following conditions are met:
  1. Battery positive voltage 11 V or higher.
  2. Throttle valve fully closed.
  3. Shift lever in P or N.
  4. A/C switch off.
2. Turn the engine switch off.
3. Connect the Techstream to the DLC3.
4. Turn the engine switch on (IG).
5. Turn the Techstream on.
6. Enter the following menus: 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.
  
  Fig 1: Identifying Check Mode MIL Flashes
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 Techstream.