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.
Symptom Charts
All diagnosis begins in SYMPTOM CHARTS - GASOLINE MODELS with QT: STEP 1: POWERTRAIN CONTROL MODULE (PCM) QUICK TEST . If the PCM Quick Test is completed and no DTCs are retrieved, the technician is directed to STEP 2: NO DTCS PRESENT SYMPTOM CHART INDEX . The No DTCs Present Symptom Chart Index contains the list of symptoms addressed and will direct the technician to the appropriate STEP 3: NO DTCS PRESENT SYMPTOM CHART . If no PCM DTCs are present and the vehicle symptom is not listed in STEP 2: NO DTCS PRESENT SYMPTOM CHART INDEX , the technician should go to the appropriate service information article to continue diagnosis.
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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.