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
Accelerator Pedal Position Sensor: Testing and Inspection
ACCELERATOR PEDAL POSITION (APP) 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. Turn the ignition switch to the ON position (Engine off).
2. Verify that the PCM terminal 1Y and 1 AC change smoothly while 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.
3. Verify that the PCM terminal 1Y and 1 AC 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 accelerator pedal.
APP Sensor Output Voltage
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.
- APP sensor terminal A and PCM terminal 1AJ
- APP sensor terminal B and PCM terminal 1Y
- APP sensor terminal C and PCM terminal 1AV
- APP sensor terminal D and PCM terminal 1U
- APP sensor terminal E and PCM terminal 1 AC
- APP sensor terminal F and main relay terminal A
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and body ground
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal C and body ground
- APP sensor terminal D and body ground
- APP sensor terminal E and power supply
- APP sensor terminal F and power supply
- APP sensor terminal F and body ground
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. Turn the ignition switch to the ON position (Engine off).
2. Verify that the PCM terminal 1Y and 1 AC change smoothly while 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.
3. Verify that the PCM terminal 1Y and 1 AC 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 accelerator pedal.
APP Sensor Output Voltage
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.
- APP sensor terminal A and PCM terminal 1AJ
- APP sensor terminal B and PCM terminal 1Y
- APP sensor terminal C and PCM terminal 1AV
- APP sensor terminal D and PCM terminal 1U
- APP sensor terminal E and PCM terminal 1 AC
- APP sensor terminal F and main relay terminal A
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and body ground
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal C and body ground
- APP sensor terminal D and body ground
- APP sensor terminal E and power supply
- APP sensor terminal F and power supply
- APP sensor terminal F and body ground
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.