2012 Honda Insight BaseFACTORY OEM SERVICE PROCEDURE

Malfunction Threshold

A malfunction is detected if the following conditions are present after the engine has stopped and the ignition switch has been turned to LOCK (0), for at least 6 hours before restarting the engine:

Temperature difference between each sensor values Malfunction judgment
ECT1 - ECT2 IAT - ECT2 ECT sensor 1 IAT sensor ECT sensor 2
Higher than 57 °F (32 °C) Higher than 57 °F (32 °C) Normal Normal Failure
From -43 °F (-24 °C) to 57 °F (32 °C) Failure Normal Normal
Lower than -43 °F (-24 °C) Failure Failure Normal
From -43 °F (-24 °C) to 57 °F (32 °C) Higher than 57 °F (32 °C) Normal Failure Normal
From -43 °F (-24 °C) to 57 °F (32 °C) Normal Normal Normal
From -44 °F (-25 °C) to -108 °F (-60 °C) Normal Failure Normal
Suspended(1)
Lower than -108 °F (-60 °C) Normal Failure Normal
Lower than -43 °F (-24 °C) Higher than 57 °F (32 °C) Failure Failure Normal
From -43 °F (-24 °C) to 57 °F (32 °C) Failure Normal Normal
Lower than -43 °F (-24 °C) Normal Normal Failure
(1) Malfunction judgment is suspended because the cooled air introduced after engine start lowers the intake air temperature; the ambient temperature condition does not stay equal.
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.