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 RX8 2RTR-1.3LFACTORY OEM SERVICE PROCEDURE
Oscilloscope Patterns and Waveforms
Inspection Using An Oscilloscope (Reference)
Front HO2S heater control
- Terminal connected:1 V (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 50 ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)
Rear HO2S heater control
- Terminal connected: 2 A (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 5- ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)
Front HO2S heater control
- Terminal connected:1 V (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 50 ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)
Rear HO2S heater control
- Terminal connected: 2 A (+)-Negative battery terminal
- Oscilloscope setting: 5 V/DIV (Y): 5- ms/DIV (X), DC range
- Measurement condition: Idling after warm-up (no load)
Factory Service Tools
Use the Manual With the Right Hardware
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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.