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.

2006 Lexus RX 330 FWDFACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

HINT:

Intelligent tester only:

Check mode has a higher sensitivity to detect malfunctions and can detect malfunctions that normal mode cannot detect. Check mode can also detect all the malfunctions that normal mode can detect.

CHECK MODE PROCEDURE (Using the intelligent tester)
1. Make sure that the items below are true:
  1. Battery positive voltage 11 V or more
  2. Throttle valve fully closed
  3. Transmission in the P or N position
  4. A/C switched OFF
2. Turn the ignition switch OFF.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON.
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Change the ECM to check mode with the intelligent tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / CHECK MODE. Make sure the MIL flashes as shown in the illustration.
  
  Fig 2: Identifying MIL Flashes
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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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.