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.
2012 Mazda CX-7 FWD L4-2.3L TurboFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION [L3 WITH TC]
NOTE:
- Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. Description and Operation
Voltage Inspection
1. Verify that no DTC related to the APP sensor and throttle actuator has been detected.
- If any DTCs related to the APP sensor or throttle actuator have been detected, perform the DTC inspection.
(See Engine - DTC Table.)
2. Connect the M-MDS to the DLC-2.
3. Start the engine and warm it up (ECT: more than 80°C {176 °F}).
4. Verify that the voltage (M-MDS PID: TP1, TP2) changes according to engine racing.
- If not as verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body. (See Service and Repair)
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See Service and Repair.)
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Throttle body terminal A and PCM terminal 2AK
- Throttle body terminal B and PCM terminal 2AO
- Throttle body terminal C and PCM terminal 2AL
- Throttle body terminal D and PCM terminal 2AJ
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal A and power supply
- Throttle body terminal A and body ground
- Throttle body terminal B and body ground
- Throttle body terminal C and power supply
- Throttle body terminal C and body ground
- Throttle body terminal D and power supply
Factory Service Tools
Use the Manual With the Right Hardware
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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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