WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

HINT.

Intelligent tester or Techstream.

Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect the malfunctions that cannot be detected in 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 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. Battery positive voltage 11 V or more.
  2. Throttle valve fully closed
  3. Transmission in the P or N position
  4. A/C switch OFF
2. Turn the power switch OFF.
3. Connect the intelligent tester or Techstream to the DLC3
4. Turn the power switch ON (IG)
5. Turn the tester ON.
6. Enter the following menus:
  1. Intelligent tester - Select. DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
  2. Techstream - Select. 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

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