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 Toyota PriusFACTORY OEM SERVICE PROCEDURE

Check Mode Procedure

HINT:

Intelligent tester only:

Compared to normal mode, check mode has more sensing ability to detect malfunction. Furthermore, the same diagnostic items which are detected in normal mode can also be detected in check mode.

CHECK MODE PROCEDURE (Using Intelligent Tester)
1. Check the initial conditions.
  1. Battery positive voltage 11 V or more
  2. Throttle valve fully closed
  3. Shift position in the P or N
  4. A/C switched OFF
2. Connect the intelligent tester to the DLC3.
3. Turn the power switch ON (IG).
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Change the ECM to check mode using the intelligent tester. Make sure the MIL flashes as shown in the illustration.
  NOTE: All DTCs and freeze frame data recorded will be erased if: 1) the intelligent tester is used to change the ECM from normal mode to check mode or vice-versa, or 2) during check mode, the power switch is switched from ON (IG) to ON (ACC) or OFF.

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.

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