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.
Malfunction Threshold
A malfunction is detected if the following conditions are present when the system is activated after the vehicle has been left for at least 6 hours:
| 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 | |
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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