2021 Honda Insight TouringFACTORY OEM SERVICE PROCEDURE

Malfunction Threshold

A malfunction is detected if the following conditions are present after the engine has stopped and the engine start/stop button has been pressed to select the OFF mode, for at least 6 hours before restarting the engine:

Temperature difference between each sensor values Malfunction judgment
ECT sensor 1 - ECT sensor 2 IAT sensor 2 - ECT sensor 2 ECT sensor 1 IAT sensor 2 ECT sensor 2
Higher than 57 deg.F (32 deg.C) Higher than 57 deg.F (32 deg.C) Normal Normal Failure
From -43 deg.F (-24 deg.C) to 57 deg.F (32 deg.C) Failure Normal Normal
Lower than -43 deg.F (-24 deg.C) Failure Failure Normal
From -43 deg.F (-24 deg.C) to 57 deg.F (32 deg.C) Higher than 57 deg.F (32 deg.C) Normal Failure Normal
From -43 deg.F (-24 deg.C) to 57 deg.F (32 deg.C) Normal Normal Normal
Lower than -43 deg.F (-24 deg.C) Normal Failure Normal
Lower than -43 deg.F (-24 deg.C) Higher than 57 deg.F (32 deg.C) Failure Failure Normal
From -43 deg.F (-24 deg.C) to 57 deg.F (32 deg.C) Failure Normal Normal
Lower than -43 deg.F (-24 deg.C) Normal Normal Failure
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.