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.
Circuit Description
The PCM opens fuel injectors by grounding an injector driver circuit. PCM monitors voltage on each driver to detect a fault. If the voltage is not what the PCM expects to monitor, do to an injector driver being shorted to voltage for example, a DTC will be set.
Conditions required to set code are:
- Battery voltage is above 9 volts
- When injector is commanded off, injector voltage is not equal ignition voltage.
- When injector is commanded on, injector voltage does not equal zero volts.
- Above conditions met for 15 seconds.
NO RELATED
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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.