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.
2004 Mazda RX8 2RTR-1.3LFACTORY OEM SERVICE PROCEDURE
Accelerator Pedal Position Sensor: Testing and Inspection
ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See FOREWORD.)
Voltage Inspection
1. Turn the ignition switch to the ON position.
2. Verify that the voltage at PCM terminals 5F (WDS PID: APP1) and 5C (WDS PID: APP2) increases while gradually increasing the accelerator pedal opening angle according to the accelerator pedal opening angle.
- If it can be verified, go to the next step.
- If it cannot be verified even though the related wiring harnesses have no malfunction, replace the accelerator pedal.
3. Verify that the voltage at PCM terminals 5F (WDS PID: APP1) and 5C (WDS PID: APP2) is as indicated in the table.
- If it cannot be verified, replace the accelerator pedal.
Circuit Open/Short Inspection
1. Disconnect the PCM connectors.
2. Disconnect the APP sensor connector.
3. Inspect the following wiring harnesses for 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 terminal 4X
- APP sensor terminal B and PCM terminal 5AB
- APP sensor terminal C and PCM terminal 5C
- APP sensor terminal D and PCM terminal 4Y
- APP sensor terminal E and PCM terminal 5AE
- APP sensor terminal F and PCM terminal 5F
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 D and body ground
- APP sensor terminal D and power supply
- APP sensor terminal A and body ground
- APP sensor terminal A and power supply
- APP sensor terminal F and body ground
- APP sensor terminal F and power supply
- APP sensor terminal C and body ground
- APP sensor terminal C and power supply
NOTE: Before performing the following inspection, make sure to follow the troubleshooting flowchart. (See FOREWORD.)
Voltage Inspection
1. Turn the ignition switch to the ON position.
2. Verify that the voltage at PCM terminals 5F (WDS PID: APP1) and 5C (WDS PID: APP2) increases while gradually increasing the accelerator pedal opening angle according to the accelerator pedal opening angle.
- If it can be verified, go to the next step.
- If it cannot be verified even though the related wiring harnesses have no malfunction, replace the accelerator pedal.
3. Verify that the voltage at PCM terminals 5F (WDS PID: APP1) and 5C (WDS PID: APP2) is as indicated in the table.
- If it cannot be verified, replace the accelerator pedal.
Circuit Open/Short Inspection
1. Disconnect the PCM connectors.
2. Disconnect the APP sensor connector.
3. Inspect the following wiring harnesses for 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 terminal 4X
- APP sensor terminal B and PCM terminal 5AB
- APP sensor terminal C and PCM terminal 5C
- APP sensor terminal D and PCM terminal 4Y
- APP sensor terminal E and PCM terminal 5AE
- APP sensor terminal F and PCM terminal 5F
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 D and body ground
- APP sensor terminal D and power supply
- APP sensor terminal A and body ground
- APP sensor terminal A and power supply
- APP sensor terminal F and body ground
- APP sensor terminal F and power supply
- APP sensor terminal C and body ground
- APP sensor terminal C 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.
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