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.
Check Mode Procedure
HINT:
Techstream only:
Compared to normal mode, check mode has more sensing ability to detect malfunctions. Furthermore, the same diagnostic items which are detected in normal mode can also be detected in check mode.
- CHECK MODE PROCEDURE (Using Techstream)
- Check the initial conditions.
- Battery positive voltage 11 V or more
- Throttle valve fully closed
- Shift position in the P or N
- A/C switched OFF
- Connect Techstream to the DLC3.
- Turn the power switch ON (IG).
- Change the ECM to check mode using Techstream. Make sure the MIL flashes as shown in the illustration.NOTE: All DTCs and freeze frame data recorded will be erased if: 1) Techstream 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.
- Check the initial conditions.
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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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