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 SYSTEMSFUEL TANK PRESSURE SENSORTESTING AND INSPECTION
2009 Mazda CX-9 FWD V6-3.7L
Fuel Tank Pressure Sensor: Testing and Inspection
2009 Mazda CX-9 FWD V6-3.7LSECTION Testing and Inspection
FUEL TANK PRESSURE SENSOR INSPECTION [MZI-3.7]
Voltage Inspection
1. Remove the evaporative hose component. Service and Repair
2. Turn the ignition switch to the ON position.
3. Plug one end of the evaporative hose component and verify that the output voltage from the fuel tank pressure sensor changes when pressure is applied from the other hose end.
- If it cannot be verified even though the related harnesses have no malfunction, replace the evaporative hose component. 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".
Circuit Open/Short Inspection
1. Disconnect the PCM connector. Service and Repair
2. Disconnect the fuel tank pressure sensor connector.
3. 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.
- Fuel tank pressure sensor terminal A and PCM terminal 1AB
- Fuel tank pressure sensor terminal B and PCM terminal 1AL
- Fuel tank pressure sensor terminal C and PCM terminal 1U
Short circuit
- If there is continuity, the circuit is shorted. Repair or replace the wiring harness.
- Fuel tank pressure sensor terminal A and power supply
- Fuel tank pressure sensor terminal A and body ground
- Fuel tank pressure sensor terminal B and power supply
- Fuel tank pressure sensor terminal C and body ground
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.