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 3 L4-2.0LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION[LF, L3]
CAUTION: This inspection procedure cannot be completed correctly if the accelerator pedal position sensor has a malfunction. Before performing this procedure, verify that any one of the DTCs (P2122, P2123, P2127, P2128, P2138) related to the accelerator pedal position sensor is not detected.
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart.
1. Verify that no DTC related to APP sensor has been detected.
- If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See TABLE[LF, L3].) Diagnostic Trouble Code Descriptions
2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to ON position.
4. Select TP1 or TP2 PID (percentage) on the M-MDS.
5. Verify that the TP1 or TP2 PID is within the specification when the accelerator pedal not depressed. (See PCM INSPECTION[LF, L3].) PCM Inspection
6. Operate the accelerator pedal and verify that the TP1 or TP2 PID (percentage) changes as shown in the following 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. Disconnect the throttle body connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
- Throttle body terminal A and PCM terminal2AK*1,2M*2
- Throttle body terminal B and PCM terminal 2AO*1,2K*2
- Throttle body terminal C and PCM terminal 2AL*\2I*2
- Throttle body terminal D and PCM terminal 2AP*1,2O*2
Short circuit
- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal A and body ground
- Throttle body terminal A and power supply
- Throttle body terminal B and body ground
- Throttle body terminal B and power supply
- Throttle body terminal C and body ground
- Throttle body terminal C and power supply
- Throttle body terminal D and body ground
- Throttle body terminal D and power supply
*1: California emission regulation applicable model and except for California emission regulation applicable model with LF MTX, L3
*2 : Except for California emission regulation applicable model with LF ATX
CAUTION: This inspection procedure cannot be completed correctly if the accelerator pedal position sensor has a malfunction. Before performing this procedure, verify that any one of the DTCs (P2122, P2123, P2127, P2128, P2138) related to the accelerator pedal position sensor is not detected.
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart.
1. Verify that no DTC related to APP sensor has been detected.
- If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See TABLE[LF, L3].) Diagnostic Trouble Code Descriptions
2. Connect the M-MDS to the DLC-2.
3. Turn the ignition switch to ON position.
4. Select TP1 or TP2 PID (percentage) on the M-MDS.
5. Verify that the TP1 or TP2 PID is within the specification when the accelerator pedal not depressed. (See PCM INSPECTION[LF, L3].) PCM Inspection
6. Operate the accelerator pedal and verify that the TP1 or TP2 PID (percentage) changes as shown in the following 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. Disconnect the throttle body connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
- If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
- Throttle body terminal A and PCM terminal2AK*1,2M*2
- Throttle body terminal B and PCM terminal 2AO*1,2K*2
- Throttle body terminal C and PCM terminal 2AL*\2I*2
- Throttle body terminal D and PCM terminal 2AP*1,2O*2
Short circuit
- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal A and body ground
- Throttle body terminal A and power supply
- Throttle body terminal B and body ground
- Throttle body terminal B and power supply
- Throttle body terminal C and body ground
- Throttle body terminal C and power supply
- Throttle body terminal D and body ground
- Throttle body terminal D and power supply
*1: California emission regulation applicable model and except for California emission regulation applicable model with LF MTX, L3
*2 : Except for California emission regulation applicable model with LF ATX
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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