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.
2005 Mazda 6 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Accelerator Pedal Position Sensor: Testing and Inspection
ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION
NOTE: Perform the following inspection only when directed.
Voltage Inspection
1. Turn the ignition key to ON position (Engine OFF).
2. Verify that the PCM terminal 42*1, 2A*2 and 43*1, 3D*2 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 42*1, 2A*2 and 43*1, 3D*2 voltages are as shown in the table.
California emission regulation applicable ATX Model
Except for California emission regulation applicable ATX Model
- If voltage is not as in 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 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 8*1, 2K*2
- APP sensor terminal B and PCM terminal 20*1,2H*2
- APP sensor terminal C and PCM terminal 42*1,2A*2
- APP sensor terminal D and PCM terminal 7*1, 3G*2
- APP sensor terminal E and PCM terminal 17*1, 3A*2
- APP sensor terminal F and PCM terminal 43*1, 3D*2
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and power supply
- APP sensor terminal A and body GND
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal C and body GND
- APP sensor terminal D and power supply
- APP sensor terminal D and body GND
- APP sensor terminal E and power supply
- APP sensor terminal F and power supply
- APP sensor terminal F and body GND
*1 : California emission regulation applicable ATX model
*2 : Except for California emission regulation applicable ATX model
NOTE: Perform the following inspection only when directed.
Voltage Inspection
1. Turn the ignition key to ON position (Engine OFF).
2. Verify that the PCM terminal 42*1, 2A*2 and 43*1, 3D*2 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 42*1, 2A*2 and 43*1, 3D*2 voltages are as shown in the table.
California emission regulation applicable ATX Model
Except for California emission regulation applicable ATX Model
- If voltage is not as in 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 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 8*1, 2K*2
- APP sensor terminal B and PCM terminal 20*1,2H*2
- APP sensor terminal C and PCM terminal 42*1,2A*2
- APP sensor terminal D and PCM terminal 7*1, 3G*2
- APP sensor terminal E and PCM terminal 17*1, 3A*2
- APP sensor terminal F and PCM terminal 43*1, 3D*2
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- APP sensor terminal A and power supply
- APP sensor terminal A and body GND
- APP sensor terminal B and power supply
- APP sensor terminal C and power supply
- APP sensor terminal C and body GND
- APP sensor terminal D and power supply
- APP sensor terminal D and body GND
- APP sensor terminal E and power supply
- APP sensor terminal F and power supply
- APP sensor terminal F and body GND
*1 : California emission regulation applicable ATX model
*2 : Except for California emission regulation applicable ATX model
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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