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 6 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Testing and Inspection
THROTTLE POSITION (TP) SENSOR INSPECTION
NOTE: Perform the following inspection only when directed.
Voltage Inspection
1. Verify that no DTC related to APP sensor has been detected.
- If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See DTC TABLE)
2. Start the engine and warm it up (ECT: more than 80 °C {176 °F}.
3. Turn the ignition switch to ON position (Engine OFF).
4. Verify that the PCM terminal 3M and 3J 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.
5. Verify that the PCM terminal 3M and 3J voltages are as shown in the given table.
- If voltage is not as given table, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
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.
- Throttle body terminal A (harness-side) and PCM terminal 3M (harness-side).
- Throttle body terminal B (harness-side) and PCM terminal 3N (harness-side).
- Throttle body terminal C (harness-side) and PCM terminal 3J (harness-side).
- Throttle body terminal D (harness-side) and PCM terminal 3K (harness-side).
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal A (harness-side) and power supply.
- Throttle body terminal A (harness-side) and body GND.
- Throttle body terminal B (harness-side) and power supply.
- Throttle body terminal B (harness-side) and body GND.
- Throttle body terminal C (harness-side) and power supply.
- Throttle body terminal C (harness-side) and body GND.
- Throttle body terminal D (harness-side) and power supply.
NOTE: Perform the following inspection only when directed.
Voltage Inspection
1. Verify that no DTC related to APP sensor has been detected.
- If any DTCs related to APP sensor have been detected, perform the DTC inspection. (See DTC TABLE)
2. Start the engine and warm it up (ECT: more than 80 °C {176 °F}.
3. Turn the ignition switch to ON position (Engine OFF).
4. Verify that the PCM terminal 3M and 3J 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.
5. Verify that the PCM terminal 3M and 3J voltages are as shown in the given table.
- If voltage is not as given table, perform the "Circuit Open/Short Inspection".
- If there is no open or short circuit, replace the throttle body.
Circuit Open/Short Inspection
1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)
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.
- Throttle body terminal A (harness-side) and PCM terminal 3M (harness-side).
- Throttle body terminal B (harness-side) and PCM terminal 3N (harness-side).
- Throttle body terminal C (harness-side) and PCM terminal 3J (harness-side).
- Throttle body terminal D (harness-side) and PCM terminal 3K (harness-side).
Short circuit
- If there is continuity, there is a short circuit. Repair or replace the wiring harness.
- Throttle body terminal A (harness-side) and power supply.
- Throttle body terminal A (harness-side) and body GND.
- Throttle body terminal B (harness-side) and power supply.
- Throttle body terminal B (harness-side) and body GND.
- Throttle body terminal C (harness-side) and power supply.
- Throttle body terminal C (harness-side) and body GND.
- Throttle body terminal D (harness-side) 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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