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.
Subsystem Checks
Before using trouble shooting section, perform DIAGNOSTIC CIRCUIT CHECK to determine that ECM and "CHECK ENGINE" light are working properly. This also determines that there are no stored trouble codes, or that there is trouble code but no "CHECK ENGINE" light.
Determine if fuel control system is operating properly by performing "Field Service Mode" check of DIAGNOSTIC CIRCUIT CHECK. Verify customer complaint. If "engine cranks but will not run", see CHART A-3 in COMPUTERIZED ENGINE CONTROL section.
Before testing fuel injection system for cause of malfunction, check that following subsystems and components are in good operating condition:
- Battery and charging system.
- Engine state of tune.
- Emission control devices.
- Fuel system pressure and delivery volume.
- Wiring connectors at components.
- Vacuum hoses for splits, kinks and proper connections.
- Air leaks at throttle body mounting and intake manifold.
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.