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.
Trouble Shooting: Notes
The Trouble Shooting section should be used only AFTER the SYSTEM CHECK chart procedures have been performed to verify that:
- On-Vehicle Diagnostics are working.
- There are no trouble codes stored, or only intermittent ones.
- Fuel control system is operating properly as verified by Field Service Mode Check.
Verify customer complaint and locate the correct symptom below. Check items indicated under that symptom. These procedures will normally lead to a component system on the vehicle, such as EGR, EST, TCC, etc. These are covered in the Component charts.
The flow charts are located in the TBI CEC TESTING article in this section. If the first flow chart leads you to another flow chart, all the test charts are in the TBI CEC TESTING article. If a flow chart leads you to trouble shooting procedures, that information will be in this article.
Check items indicated under that symptom. These procedures will normally lead to a component system on the vehicle, such as EGR, EST, TCC, etc. These systems are covered in the component charts.
Several of the following symptom procedures call for a careful visual check. Visual check should be performed CAREFULLY and THOROUGHLY as it can correct a problem without further checks or diagnosis. This check should include:
- Vacuum hoses for splits, kinks and proper connections, as shown on Emission Control Information label.
- Air leaks at throttle body mounting and intake manifold.
- Ignition wires for cracking, hardness, proper routing, and carbon tracking.
- Wiring for proper connections, pinches, and cuts.
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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.