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.
2011 Mazda RX8 2RTR-1.3LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION [13B-MSP]
CAUTION:
- This inspection procedure cannot be completed correctly if the accelerator pedal position sensor has a malfunction. Before performing this procedure, verify that any one of the DTC related to the accelerator pedal position sensor is not detected.
NOTE:
- Before performing the following inspection, make sure to follow the troubleshooting flowchart. Initial Inspection and Diagnostic Overview
Voltage Inspection
1. Turn the ignition switch to the ON position.
2. Verify that the voltage at PCM terminals 2AK (M-MDS PID: TP1) and 2AL (M-MDS PID: TP2) 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 throttle body. Intake-Air System Removal/Installation
3. Verify that the voltage at PCM terminals 2AK (M-MDS PID: TP1) and 2AL (M-MDS PID: TP2) is as indicated in the table.
- If it cannot be verified, replace the throttle body. Intake-Air System Removal/Installation
TP sensor output voltage
Circuit Open/Short Inspection
1. Disconnect the PCM connector.
2. Disconnect the throttle body 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.
- Throttle body terminal C and PCM terminal 2P
- Throttle body terminal D and PCM terminal 2AL
- Throttle body terminal E and PCM terminal 2AO
- Throttle body terminal F and PCM terminal 2AK
Short circuit
- If there is continuity in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal E and body ground
- Throttle body terminal E and power supply
- Throttle body terminal F and body ground
- Throttle body terminal F and power supply
- Throttle body terminal D and body ground
- Throttle body terminal D 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.