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
Oscilloscope Patterns and Waveforms
Inspection Using An Oscilloscope (Reference)
IGT1, IGT2 control signals
PCM terminals
- IGT1 (No.1 and No.4): 1A (+) - 1D (-)
- IGT2 (No.2 and No.3): 1B (+)- 1C (-)
Oscilloscope setting
- 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off).
CKP sensor signal
(+)
PCM terminals
- 2D (+) - 2H (-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load P/S off, A/C off)
(-)
PCM terminals
- 2G (+) - 2H (-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx 700 rpm, no load, P/S off, A/C off)
IGT1, IGT2 control signals
PCM terminals
- IGT1 (No.1 and No.4): 1A (+) - 1D (-)
- IGT2 (No.2 and No.3): 1B (+)- 1C (-)
Oscilloscope setting
- 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load, P/S off, A/C off).
CKP sensor signal
(+)
PCM terminals
- 2D (+) - 2H (-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 700 rpm, no load P/S off, A/C off)
(-)
PCM terminals
- 2G (+) - 2H (-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx 700 rpm, 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.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.