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.
Chart A-5, Fuel Injection CKT Check (No-Start): Notes
When fuel injector is energized by ECM, it will activate fuel injector plunger and pressurized fuel will be injected into throttle body. Fuel pump will operate as long as engine is cranking and ECM is receiving ignition reference pulses.
- Checks to see if ECM is controlling fuel injector signals.
- This checks fuel injector for correct resistance.
- This checks for voltage at fuel injector.
- This checks for an open or short to ground in Yellow/Black wire, a faulty ECM and a faulty fuel injector.
- This checks for an open or short to ground in Yellow wire, an open in White/Blue wire, and a faulty fuel injector resistor.
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.