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.
Monitor Scan Tool Data
- Ignition "ON" & Engine "OFF".
- Disconnect IATS connector.
- Connect scan tool and monitor the "INT. AIR TEMP. SNSR (V)" parameter on the scan tool data list.
- Jumper the terminals 1 and 5 of the sensor harness connector together.
Specification: Approx. 0V
- Is IAT data near the specified value?
YES
- Possibility of sensor malfunction. Go to "COMPONENT INSPECTION " procedure.
NO
- Go to step 6.
- Jumper the terminal 5 of the IATS harness connector to chassis ground.
- Read "INT. AIR TEMP. SNSR (V)" parameter on the scan tool.
Specification: Approx. 0V
- Is displayed IAT data near the specified value?
YES
- Possibility of open in IATS ground circuit. Go to "GROUND CIRCUIT INSPECTION " procedure.
NO
- Possibility of open or short to battery in IAT signal circuit. Go to "SIGNAL CIRCUIT INSPECTION " procedure.
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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