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
Accelerator Pedal Position Sensor: Testing and Inspection
ACCELERATOR PEDAL POSITION (APP) 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. Turn the ignition switch to the ON position (Engine OFF).
2. Verify that the PCM terminal 1AC, 1AG and 1AK 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 1AC, 1AG and 1AK voltages are as shown in the table.
- If voltage is not according to the table, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace accelerator pedal.
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.
- APP sensor terminal B and PCM terminal 1 AC
- APP sensor terminal C and PCM terminal 1 AH
- APP sensor terminal D and PCM terminal 1 Y
- APP sensor terminal E and PCM terminal 1 AK
- APP sensor terminal F and PCM terminal 1 BA
- APP sensor terminal G and PCM terminal 1 AD
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- 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 body ground
- APP sensor terminal E and body ground
- APP sensor terminal E and power supply
- APP sensor terminal F and body ground
- APP sensor terminal G and power supply
NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.
Voltage Inspection
1. Turn the ignition switch to the ON position (Engine OFF).
2. Verify that the PCM terminal 1AC, 1AG and 1AK 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 1AC, 1AG and 1AK voltages are as shown in the table.
- If voltage is not according to the table, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace accelerator pedal.
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.
- APP sensor terminal B and PCM terminal 1 AC
- APP sensor terminal C and PCM terminal 1 AH
- APP sensor terminal D and PCM terminal 1 Y
- APP sensor terminal E and PCM terminal 1 AK
- APP sensor terminal F and PCM terminal 1 BA
- APP sensor terminal G and PCM terminal 1 AD
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- 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 body ground
- APP sensor terminal E and body ground
- APP sensor terminal E and power supply
- APP sensor terminal F and body ground
- APP sensor terminal G 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.