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 Mazdaspeed3 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. (See HOW TO USE THIS MANUAL.)
Voltage Inspection
1. Verify that no DTC related to the APP sensor has been detected.
- If any DTCs related to the APP sensor have been detected, perform the DTC inspection. (See01-02B-14 DTC TABLE[L3 WITH TC].) Diagnostic Trouble Code Descriptions
2. Start the engine and warm it up (ECT: more than 80 |C {176 °F}).
3. Turn the ignition switch to the ON position (Engine off).
4. Verify that the PCM terminal 2AK and 2AL change smoothly while the throttle valve is gradually opened.
- If as verified, go to next step.
- If not as verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
5. Verify that the PCM terminal 2AK and 2AL voltages are as shown in the following table.
- If the voltage is not according to the following table, 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 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 2AP
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
NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL.)
Voltage Inspection
1. Verify that no DTC related to the APP sensor has been detected.
- If any DTCs related to the APP sensor have been detected, perform the DTC inspection. (See01-02B-14 DTC TABLE[L3 WITH TC].) Diagnostic Trouble Code Descriptions
2. Start the engine and warm it up (ECT: more than 80 |C {176 °F}).
3. Turn the ignition switch to the ON position (Engine off).
4. Verify that the PCM terminal 2AK and 2AL change smoothly while the throttle valve is gradually opened.
- If as verified, go to next step.
- If not as verified, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
TP Sensor Output Voltage:
5. Verify that the PCM terminal 2AK and 2AL voltages are as shown in the following table.
- If the voltage is not according to the following table, 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 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 2AP
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
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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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