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 Mazdaspeed6 L4-2.3L TurboFACTORY OEM SERVICE PROCEDURE
Oscilloscope Patterns and Waveforms
Inspection Using An Oscilloscope (Reference)
Generator output voltage signal
PCM terminals
1AB(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)
Generator field coil control signal
PCM terminals
- 1 AD(+)-Body ground(-)
Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)
Fuel injector check signal
PCM terminals
- 2B(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC off)
CKP sensor signal
PCM terminals
- 2C(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
CMP sensor signal
PCM terminals
- 2E(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 50 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
Fuel injection control
PCM terminals
- Fuel Injection No.1: 3B(+)-Body ground(-)
- Fuel Injection No.2: 3E(+)-Body ground(-)
- Fuel Injection No.3: 3H(+)-Body ground(-)
- Fuel Injection No.4: 3K(+)-Body ground(-)
Oscilloscope safing
- 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
IGT control signals
PCM terminals
- IGT1(No.1): 3W(+)-Body ground(-)
- IGT2(No.2): 3X(+)-Body ground(-)
- I GT3(No.3): 3Z(+)-Body ground(-)
- IGT4(No.4): 3AA(+)-Body ground(-)
Oscilloscope safing
- 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
DCV control signal
PCM terminals
- 4S(+)-Body ground(-)
Oscilloscope setting
- 2.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
Purge control signal
PCM terminals
- 4T(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, A/C off)
HO2S (front) heater control signal
PCM terminals
- 4AD(+)-Body ground(-)
Oscilloscope setting
- 2.5 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after engine start (no load, P/S off, A/C off)
Generator output voltage signal
PCM terminals
1AB(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)
Generator field coil control signal
PCM terminals
- 1 AD(+)-Body ground(-)
Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)
Fuel injector check signal
PCM terminals
- 2B(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S oft, NC off)
CKP sensor signal
PCM terminals
- 2C(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
CMP sensor signal
PCM terminals
- 2E(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 50 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
Fuel injection control
PCM terminals
- Fuel Injection No.1: 3B(+)-Body ground(-)
- Fuel Injection No.2: 3E(+)-Body ground(-)
- Fuel Injection No.3: 3H(+)-Body ground(-)
- Fuel Injection No.4: 3K(+)-Body ground(-)
Oscilloscope safing
- 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
IGT control signals
PCM terminals
- IGT1(No.1): 3W(+)-Body ground(-)
- IGT2(No.2): 3X(+)-Body ground(-)
- I GT3(No.3): 3Z(+)-Body ground(-)
- IGT4(No.4): 3AA(+)-Body ground(-)
Oscilloscope safing
- 2 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
DCV control signal
PCM terminals
- 4S(+)-Body ground(-)
Oscilloscope setting
- 2.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, NC off)
Purge control signal
PCM terminals
- 4T(+)-Body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (no load, P/S off, A/C off)
HO2S (front) heater control signal
PCM terminals
- 4AD(+)-Body ground(-)
Oscilloscope setting
- 2.5 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after engine start (no load, P/S off, A/C off)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.