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.
Signal Waveform & Data
- Ch A : INJ HIGH SIDE signal during fuel injection (Normal idle state)
- Ch B : INJ LOW SIDE signal during fuel injection (Normal idle state)
- Ready: Pre-energizing range for the quick response of injector.
ECU drives specific duty pulse to a injector.
During "Ready", Injector doesn't work yet. The supply voltage to a injector is 12V.
- Rise: ECU starts to peak current rapidly for injector working.
The supply voltage is upturned from 12V to 55V. At the peak of current, injector starts to open.
- Peak/Hold: Holding the peak current until the injector would be completely open.
- Hold: ECU drives specific duty pulse for holding the injector's open state.
The injector will quickly close once the PCM discontinues current.
NO RELATED
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.