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 SYSTEMSENGINE TEMPERATURE SENSORTESTING AND INSPECTION
2009 Mazda CX-9 FWD V6-3.7L
Engine Temperature Sensor: Testing and Inspection
2009 Mazda CX-9 FWD V6-3.7LSECTION Testing and Inspection
CYLINDER HEAD TEMPERATURE (CHT) 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 CHT sensor connector.
2. Measure the resistance between the CHT sensor terminals.
- If it is not within the specification, replace the CHT sensor.
- 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".
Measure the cylinder head temperature sensor resistance (approx.).
Cylinder head temperature 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.
- CHT sensor terminal A and PCM terminal 2AL
- CHT sensor terminal B and PCM terminal 2AN
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
- CHT sensor terminal A and power supply
- CHT sensor terminal A and body ground
- CHT sensor terminal B and power supply
RENDER: 1.0x
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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.