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.
Section 3: Symptom Charts
This section is where all diagnosis begins in Step 1: Powertrain Control Module (PCM) / Transaxle Control Module (TCM) Quick Test. If the Powertrain Control Module (PCM) / Transaxle Control Module (TCM) Quick Test is completed and no DTCs are retrieved, the technician may be directed to Step 2: No Diagnostic Trouble Code (DTC) Present Symptom Chart Index (refer to SYMPTOM CHARTS article for details). The No Diagnostic Trouble Code (DTC) Present Symptom Chart Index contains the list of symptoms addressed in these articles, and sends the technician to the appropriate Step 3: No Diagnostic Trouble Code (DTC) Present Symptom Chart. If no PCM or TCM DTCs are present and the vehicle symptom is not listed in Step 2: No Diagnostic Trouble Code (DTC) Present Symptom Chart Index, the technician should go to the appropriate 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.