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.
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HOMESERVICE MANUALSMAZDA2009CX-9 FWD V6-3.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )TESTING AND INSPECTION
2009 Mazda CX-9 FWD V6-3.7L
Air Temperature Sensor ( Ambient / Intake ): Testing and Inspection
2009 Mazda CX-9 FWD V6-3.7LSECTION Testing and Inspection
INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [MZI-3.7]
NOTE:
- Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. Description and Operation
Resistance Inspection
1. Disconnect the MAF/IAT sensor connector.
2. Measure the resistance between MAF/IAT sensor terminals A and F.
- If not within the specification, replace the MAF/IAT sensor. Service and Repair
- If the monitor item status/specification (reference) is not within the specification, even though the resistance is within the specification, perform the "Circuit Open/Short Inspection".
IAT sensor resistance
IAT sensor characteristics graph (reference)
Circuit Open/Short Inspection
1. Disconnect the PCM connector. Service and Repair
2. Inspect the following wiring harnesses for open or short. (Continuity inspection)
Open circuit
- If there is no continuity, the circuit is open. Repair or replace the wiring harness.
- MAF/IAT sensor terminal B and body ground
- MAF/IAT sensor terminal F and PCM terminal 1AF
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
- MAF/IAT sensor terminal B and power supply
- MAF/IAT sensor terminal F and body ground
- MAF/IAT sensor terminal F and power supply
RENDER: 1.0x
NO RELATED
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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.