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
Accelerator Pedal Position Sensor: Testing and Inspection
ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION[LF, L3]
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart.
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to ON position.
3. Select APP1 and APP2 PID on the M-MDS.
4. Verify that the APP1 and APP2 PID is within the specification when the accelerator pedal not depressed. (See PCM INSPECTIONS L3].) PCM Inspection
Circuit Open/Short Inspection
1. Disconnect the PCM connectors.
2. Disconnect the APP sensor 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.
- APP sensor terminal A and PCM terminal1AL*1 *2, 1AW*3
- APP sensor terminal B and PCM terminal 1AP*1*2, 1Y*3
- APP sensor terminal C and PCM terminal 1AS*\ 1AV*2, 1AA*3
- APP sensor terminal D and PCM terminal body ground
- APP sensor terminal E and PCM terminal 1AC*1, 1AO*2, 1AL*3
- APP sensor terminal F and main relay terminal A
Short circuit
- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and body ground
- APP sensor terminal B and body ground
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal D and power supply
- APP sensor terminal E and body ground
- APP sensor terminal E and power supply APP sensor terminal F and power supply
*1California emission regulation applicable model
*2Except for California emission regulation applicable model with LF MTX, L3
*3Except for California emission regulation applicable model with LF ATX
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart.
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to ON position.
3. Select APP1 and APP2 PID on the M-MDS.
4. Verify that the APP1 and APP2 PID is within the specification when the accelerator pedal not depressed. (See PCM INSPECTIONS L3].) PCM Inspection
Circuit Open/Short Inspection
1. Disconnect the PCM connectors.
2. Disconnect the APP sensor 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.
- APP sensor terminal A and PCM terminal1AL*1 *2, 1AW*3
- APP sensor terminal B and PCM terminal 1AP*1*2, 1Y*3
- APP sensor terminal C and PCM terminal 1AS*\ 1AV*2, 1AA*3
- APP sensor terminal D and PCM terminal body ground
- APP sensor terminal E and PCM terminal 1AC*1, 1AO*2, 1AL*3
- APP sensor terminal F and main relay terminal A
Short circuit
- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and body ground
- APP sensor terminal B and body ground
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal D and power supply
- APP sensor terminal E and body ground
- APP sensor terminal E and power supply APP sensor terminal F and power supply
*1California emission regulation applicable model
*2Except for California emission regulation applicable model with LF MTX, L3
*3Except 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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