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.
2007 Mazda CX-9 V6-3.5LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION [MZI-3.5]
NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.
Voltage Inspection
1. Verify that no DTC related to APP sensor has been detected.
- It any DTCs related to APP sensor have been detected, perform the DTC inspection. (See DTC TABLE [MZI-3.5].) Diagnostic Trouble Code Descriptions
2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to the ON position.
4. Select TP1 or TP2 PID (voltage) on the M-MDS.
5. Operate the accelerator pedal and verify that the TP1 or TP2 PID (voltage) changes as shown in the graph.
- If not verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Throttle body terminal C and PCM terminal 2AD
- Throttle body terminal D and PCM terminal 2D
- Throttle body terminal E and PCM terminal 2AH
- Throttle body terminal F and PCM terminal 2Z
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal C and power supply
- Throttle body terminal C and body ground
- Throttle body terminal D and body ground
- Throttle body terminal E and power supply
- Throttle body terminal F and body ground
- Throttle body terminal F and power supply
NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.
Voltage Inspection
1. Verify that no DTC related to APP sensor has been detected.
- It any DTCs related to APP sensor have been detected, perform the DTC inspection. (See DTC TABLE [MZI-3.5].) Diagnostic Trouble Code Descriptions
2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to the ON position.
4. Select TP1 or TP2 PID (voltage) on the M-MDS.
5. Operate the accelerator pedal and verify that the TP1 or TP2 PID (voltage) changes as shown in the graph.
- If not verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
Circuit Open/Short Inspection
Circuit Open/Short Inspection:
1. Disconnect the PCM connector.
2. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Throttle body terminal C and PCM terminal 2AD
- Throttle body terminal D and PCM terminal 2D
- Throttle body terminal E and PCM terminal 2AH
- Throttle body terminal F and PCM terminal 2Z
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal C and power supply
- Throttle body terminal C and body ground
- Throttle body terminal D and body ground
- Throttle body terminal E and power supply
- Throttle body terminal F and body ground
- Throttle body terminal F and power supply
Factory Service Tools
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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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